Fast Construction Research Articles

Analysis Welding Types Pipe Fabrication Process in Missile Fast Attack Boat Construction

The equipment in the piping system consists of pipes, valves, flanges, filters, fittings, pumps, and others. The installation schedule for this piping system begins after the connection between blocks. Pipes as part of a ship's system have several steps in their installation procedure, one of which is welding. Welding on pipes is carried out by professional welders who have met more complex competency requirements than welders in general, such as flat position welders, vertical welders, or overhead welders. The purpose of this study was to determine the welding process and types of welding in pipe fabrication for the construction of the Missile Fast Attack Boat. Result comparison between the diameters of the welded pipes, the greater the value of the welding volume formed. The largest volume is 426 mm3, with a pipe length for the fabrication process of 4,3 m. On the other hand, the shortest fabrication is for welding pipes with a diameter of 2,5 m, which has a volume of 127 mm3. While the welding process using GTAW / Gas Tungsten Arc Welding (TIG) is very appropriate for welding in small areas and thin pipes. The TIG welding process has an average volume of below 150 mm3.

Hand drill shape optimization using Open CASCADE library and the steepest descent method

In this article, compliance optimization with the steepest descent method of the hand drill bits shapes for metal drilling is presented. The analysis of stress, displacements and compliance of the solid with random shape can be performed using the finite element method. In the case of a high number of optimization iterations, each analysis needs automatic modifications of geometry, mesh and boundary conditions. The Open CASCADE library can be used in the fast and automatic construction of modified models. It allows for fast reanalysis for each derivative of the objective function in the optimization process. The motivation of this research is to fill the gap in the literature on drilling technology. Most of the contemporary research is devoted to the oil and gas industry, while optimization of the hand drill bits used in metal drilling is rare. Compliance optimization allows us to find the shape which guarantees a greater stiffness for the specified loading conditions and a given amount of material. Although the obtained compliance was low, further experimental research would be needed to apply new solutions in drilling practice. This will involve the construction of the drill bit tips and the development of a heat treatment process

Carbon-mechanic dual-control design decision model of prefabricated structural components

Prefabricated enclosure structures (PES) have become the key technology for low-carbon construction in the engineering field due to their low labor demand, fast construction speed, and low environmental pollution. In the context of low-carbon development, efficiently designing PES that not only possess high-strength but also demonstrate significant greenhouse gas (GHG) reduction benefits has become a critical challenge. The objective of this study is to address the challenges of automated design and scientific decision-making methods for PES components. First, the Carbon-mechanic dual-control assessment model (CDAM) is proposed, providing a novel evaluation dimension for the design of prefabricated components. Subsequently, based on the CDAM, an automated design decision-making process, and model for components are established using an improved genetic algorithm and parameterized method. Finally, under the constraints of actual engineering conditions, adaptive solutions were automatically generated for specific cases. These solutions were comprehensively evaluated and optimized using CDAM, resulting in design guidelines and optimal solutions for PES that balance environmental performance and load-bearing capacity. The case analysis results show that the optimal scheme based on the carbon-mechanic dual-control (CM) index is: the sectional dimension is 830 mm, the reinforcement ratio is 0.9 % and the cavity ratio is 45 %, which shows the ideal characteristics of low-carbon and high-strength. Compared with the single index decision scheme, this scheme achieve a maximum of 42 % GHG emissions reduction. The high comprehensive performance scheme is characterized by small sectional dimension, high reinforcement ratio, and high cavity ratio. Cavity ratio is a key parameter to achieve high performance design. The research findings provide an important theoretical basis and technical support for the low-carbon transformation in the engineering field.

Facile and fast construction of biomimetic, waterborne, and superhydrophobic coatings via spraying strategy

Typically, the preparation of superhydrophobic coatings may release a large amount of volatile organic compounds (VOCs), which will be potentially harmful to the environment. In this condition, waterborne coatings have gradually become the main method to replace the traditional organic solvent-based coatings in recent years. Inspired by natural superhydrophobic phenomena, biomimetic, waterborne, and superhydrophobic coatings with multi-functional integration have been prepared via a one-step pneumatic spraying technique in this paper. The coatings were mainly composed of solvent (water), low surface energy substances (polytetrafluoroethylene emulsion (PTFE)), binding agents (waterborne silicone resin (WSR)), rough structure maker (polyphenylene sulfide (PPS) and graphene powder (GP)), and filler dispersion agent (dodecyl phenyl polyoxyethylene (OP-10)). Owing to the formation of hierarchical micro/nano-scaled structure covered with low surface energy, the water contact angle (WCA) and water sliding angle (WSA) values of as-prepared coatings can reach 155.5° ± 1.1° and 9.2° ± 0.3°, respectively. This is feasible for endowing the coatings with rich surface functionalities such as self-cleaning properties, anti-icing ability, anti-corrosion properties, and oil-water separation. Furthermore, the adequate durability and stability of as-prepared coatings have been confirmed by a series of mechanical and chemical damage tests. The super-hydrophobicity can be retained even after 12 m sandpaper abrasion, 24 h continuous UV irradiation and acid/alkali immersion tests. Thus, this article has provided an effective and simplified strategy for preparing multifunction-integrated and waterborne superhydrophobic coatings, which will extend its potential application in many daily life and industrial fields.

To Study the Construction Techniques for Slum Rehabilitation In Metro Cites

With increasing urbanization, the need for adequate affordable shelter also increases. Housing shortage is one of the major challenges faced in developing countries like India. It is imperative to provide housing that caters to all income groups with special focus on the low and middle income groups. In order to provide low cost housing, it is essential to adopt innovative sustainable technologies which are affordable, fast track, cost effective, durable as well as environment friendly. This seminar discusses emerging innovative technologies that can be adopted in the country to lower housing construction cost and help in provision of mass affordable housing. Some of the technologies discussed are Tunnel form, Sismo building technology, Light Gauge Steel Framed Structural technology, Precast Sandwich Panel technology etc. These technologies are reviewed on various parameters like local availability, affordability, energy efficiency, structural stability, quality, speed, cost effectiveness, eco friendliness and suitability for high rise construction. The advantages and limitations of the technologies are also mentioned. The seminar highlights the potential barriers for adoption of these technologies in the Indian urban scenario and methods which can be employed to overcome those barriers in order to provide affordable housing for the low and middle income groups. Fast track construction is very much essential for the mass housing projects like slum rehabilitation . For this rapid wall technique can be best option for construction

Effective Utilization of Pre Engineering building (PEB) construction for Development of Rapid Healthcare facilitates in Medical Emergency

World is developing at a faster pace in all spheres of technology. The parameters whichdetermine the development have changed a lot in the recent past and will keep changing in future too.Rapid rise in levels of education, high rates of technological innovations and applications, ever faster andcheaper communication that dissolves physical and social barriers both within countries andinternationally, greater availability and easier access to information, and the further opening up of globalmarkets are the set of catalytic forces that is accelerating the speed of social change throughout theworld.Pre Engiering building is one of the best application of fast track construction Pre-Engineered Buildingconcept involves the steel building systems which are predesigned and prefabricated .The presentconstruction methodology calls for the best aesthetic look, high quality fast construction, costeffective innovative touch. One has to think for alternative construction system like pre-engineeredsteel buildings. In recent years, the introduction of Pre Engineered Building (PEB) concept in the designof structures has helped in optimizing design. In this report the detail explore of pre engineering as afast tack construction’s application discuss . As the world battles the ongoing COVID-19 pandemic, ithas become very clear that societies depend on functioning healthcare facilities. The sufficientavailability of hospital beds, healthcare staff, protective gear or ventilators can make all the differencebetween a situation that is still manageable and a severe crisis. for this infrastructure facilities should beprepare in short time ,For this EPS Pannel and UPVC panels will be use for rapid construction ofhealthcare facilities

Towards an automated framework for numerical prediction of residual stresses and deformations in metal additive manufacturing

Metal additive manufacturing (AM) revolutionizes design with complex structures and customizable material properties. However, high-energy heat source utilized in metal AM creates non-uniform temperature gradients, which usually leads to significant residual stresses and deformations. The present study proposes a line source based semi-analytical thermo-mechanical approach. The accuracy of the proposed line source based model is thoroughly examined by comparing with corresponding experiments in the literature and other numerical models. Besides, an automated framework for fast construction of a thermo-mechanical FE model for the metal AM process is introduced. A numerical tool AM-builder is developed to bridge the gap between AM process parameters and the FE model. The proposed automated framework is followed by utilization of the AM-builder and the line source based model. A purely numerical example is conducted to demonstrate the effectiveness of the proposed automated framework in rapidly constructing AM thermo-mechanical models for various geometries.

Energy required to cut the soil with No.4 circumferential knives of the large rotor of the straight-through rotary ripper

Introduction. To solve the problem of the fast and high-quality road construction, when economic facilities and settlements are located at a considerable distance from each other, cannot be solved without the use of a complex of continuous units. The continuous ditch forming unit and the tunneling unit contain straight-through rotary rippers. Insufficient theoretical studies in this area do not enable to calculate the interaction of the elements of a direct-flow rotary ripper with the soil. Therefore, there is a need for theoretical studies to determine the energy parameters of the large rotor, in particular, that which is necessary for cutting the soil with the No.4 circumferential knives of the large rotor.The research method. The methods for calculating the required energy inputs: to separate the reservoir from the soil mass; separation of the reservoir into fragments; creating a gap in the soil mass; deformation of a part of the soil mass; overcoming the friction of the ground on the edge of the blade; overcoming the soil pressure on the front surface; movement of the soil by the front surface; overcoming the friction of the ground on the front surface have been developed.Results. On the basis of the developed methods, the parameter calculations were made. From the plane models and the spatial model of the forces of interaction with the soil of the circumferential knives No.4 of the large rotor, resultant forces, their components, normal forces were revealed. The force of friction of the soil on the edge of the blade and the front surface of No4 circumferential knives was calculated. The volumetric energy required for cutting with No.4 circumferential knives when mining one cubic meter of soil with a straight-through rotary ripper is calculated.Conclusion. The energy required to drive the circumferential knife includes separating the seam from the soil mass; separation of the reservoir into fragments; creating a gap in the soil mass; deformation of a part of the soil mass; overcoming the friction of the ground on the edge of the blade; overcoming the soil pressure on the front surface; movement of the soil by the front surface; overcoming the friction of the ground on the front surface. As a result of the calculations, the total energy required for cutting with No.4 circumferential knives, when mining one cubic meter of soil with a straight-through rotary ripper, was 9110 joules.

Study on Vibration and Noise of Railway Steel–Concrete Composite Box Girder Bridge Considering Vehicle–Bridge Coupling Effect

A steel–concrete composite beam bridge fully exploits the mechanical advantages of the concrete structure and steel structure, and has the advantages of a fast construction speed and large stiffness. It is of certain research value to explore the application of this bridge type in the field of railway bridges. However, with the rapid development of domestic high-speed railway construction, the problem of vibration and noise radiation of high-speed railway bridges caused by train loads is becoming more and more serious. A steel–concrete composite beam bridge combines the tensile characteristics of steel and the compressive characteristics of concrete perfectly. At the same time, it also has the characteristics of a steel bridge and concrete bridge in terms of vibration and noise radiation. This feature makes the study of the vibration and noise of the bridge type more complicated. Therefore, in this paper, the characteristics of vibration and noise radiation of a high-speed railway steel–concrete composite box girder bridge are studied in detail from two aspects: the theoretical basis and a numerical simulation. The main results obtained are as follows: Relying on the idea of vehicle–rail–bridge coupling dynamics, a structural dynamics analysis model of a steel–concrete combined girder bridge for a high-speed railroad was established, and numerical program simulation of the vibration of the vehicle–rail–bridge coupling system was carried out based on the parametric design language of ANSYS 18.0 and the language of MATLAB R2021a, and the structural vibration results were analyzed in both the time domain and frequency domain. By using different time-step loading for the vehicle–rail–bridge coupling vibration analysis, the computational efficiency can be effectively improved under the condition of guaranteeing the accuracy of the result analysis within 100 Hz. Based on the power flow equilibrium equation, a statistical energy method of calculating the high-frequency noise radiation is theoretically derived. Based on the theoretical basis of the statistical energy method, the high-frequency noise in the structure is numerically simulated in the VAONE 2021 software, and the average contribution of the concrete roof plate to the three acoustic field points constructed in this paper is as high as 50%, which is of great significance in the study of noise reduction in steel–concrete composite girders.

Stretchable conductive shape-memory nanocomposites for programmable electronics via photo-mediated multiscale structural design

Conductive shape-memory nanocomposites are very promising in flexible electronics, soft robotics, wearable sensors, etc. However, achieving a balance between conductivity, shape-memory behavior, and stretchability is still challenging in this field. Here, we report stretchable conductive shape-memory nanocomposites (SCSMNCs) prepared through photo-mediated multiscale structural design (PMMSD). At a molecular level, we utilize highly efficient photo-mediated radical polymerization and hydrogen abstraction reaction to fast construct a conjoined polymeric network in one step (∼68 s). Hybrid nanofibers are, meanwhile, introduced to generate highly conductive networks. This rational design facilitates the fabrication of nanocomposites simultaneously exhibiting excellent shape-memory behavior, high conductivity, improved mechanical properties, and rapid gelation. Mechanics-guided metamaterial design can be then produced in macro-scale by additive manufacturing to further increase the stretchability of the nanocomposites without compromising other key properties. Consequently, benefitting from the PMMSD strategy, the stretching strain of SCSMNCs improves significantly by 19 times compared to the samples lacking network and structural design, with conductivity > 105 S/m, shape fixation ratio and shape recovery ratio > 95 %. Notably, the combination of the increased stretchability, high conductivity and excellent shape-memory behavior endows the SCSMNCs with adaptive electrical and mechanical properties over long ranges. Based on these advanced performances, we demonstrate the utility of the designed SCSMNCs as function-programmable electromagnetic interference shields and wearable sensors. We anticipate this study will pave a new way for the design and application of high-performance SCSMNCs.

The development characteristics and prospect of pumped storage power station as the main energy storage facility in China under the background of double Carbon

Abstract Intending to reach the peak of carbon and carbon neutrality, to become a global consensus, and to achieve the goal of “reaching the peak of carbon emissions before 2023 and carbon neutrality before 2060”, China proposed in March 2021 to construct a new power system with new energy as its core. For the realization of the above goals, the construction of a pumped storage power station is quite important, and it is the key to the realization of green and low-carbon energy transformation and has a crucial impact on the achievement of China’s “double carbon” goal. This paper first introduces the related concepts of dual-carbon background and pumped storage power stations. Then the development dynamics of the station in a period are analyzed to obtain its characteristics, such as wide distribution, fast construction, and variety. Finally, this paper puts forward and summarizes the suggestions and prospects of pumped storage power stations for China’s new energy growth.

On shape design and optimization of gerotor pumps

AbstractA gerotor pump is a two‐piece mechanism where two rotational components, interior and exterior, engage each other via a rotational motion to transfer a fluid in a direction parallel to their rotational axes. A natural question arises on what shape of the gerotor is the optimal one in the sense of maximum fluid being pumped for a unit of time, given the constraint of a fixed material needed to manufacture the pump. As there is no closed‐formula to answer this question, we propose a new algorithm to design and optimize the shape of gerotor pumps to be as efficient as possible. The proposed algorithm is based on a fast construction of the envelope of the interior component and subsequent optimization. We demonstrate our algorithm on a benchmark gerotor and show that the optimized solution increases the estimated flowrate by 16%. We also use our algorithm to study the effect of the number of teeth on the cavity area of a gerotor.

Surface Grafting of Magnetic Carbon Nanotubes and Their Vertical Alignment in PVDF Asymmetric Ultrafiltration Membranes for Fast Nanochannel Construction

The application of carbon nanotubes (CNTs) in water treatment membranes can increase the permeability and selectivity of the membranes. However, traditional CNTs are usually affected by van der Waals forces, which makes them prone to agglomerate in polymer membranes, and their non-directional arrangement in the membranes limits their transport efficiency as water channels in the membranes. In this paper, a reversible addition-fragmentation chain transfer (RAFT) polymerization method was used to synthesize propargyl methacrylate - random copolymerization - poly (ethylene glycol) methacrylate - block - polymethyl methacrylate [P(PgMA-r-PEGMA) -b-PMMA]. The P(PgMA-r-PEGMA)-b-PMMA grafting rate was 60.4% on the surface of magnetic sulfhydryl functionalized carbon nanotubes (mCNTs-SH) by click-reaction grafting. Poly (vinylidene fluoride) (PVDF)/CNTs composite ultrafiltration membranes were prepared using vapor-induced phase separation (VIPS) combined with magnetic field arraying. When the mCNTs-g-P(PgMA-r-PEGMA)-b-PMMA were vertically aligned in the PVDF membrane through a magnetic field, the effective construction of the vertical nanochannels was realized, and an increased purified water flux from 25.6 LMH to 35.8 LMH, with the composite ultrafiltration membranes was obtained. In addition, the membranes also showed excellent hydrophilicity, mechanical properties, and polyethylene glycol 1200 (PEG1200) rejection. The water contact angle was reduced from 105° to 79°, the rejection of PEG1200 was increased from 44% to 91% of the 0.5 g/L PEG aqueous solutions, and excellent mechanical properties (tensile strengthes up to 9.3 MPa) were achieved. By designing the interface structure of the CNTs and studying the orientation of the CNTs in PVDF membranes, this work provides a new research idea for the field of water treatment ultrafiltration membranes.

Cyclic response sensitivity of coupled composite plate shear walls/concrete filled (CC-PSWs/CF)

A composite plate shear wall/concrete filled system, also known as “SpeedCore”, is a new lateral force-resisting system used as core walls in mid- and high-rise buildings. This composite wall system eliminates some of the conventional construction requirements in reinforced concrete core walls, resulting in faster construction and cost savings. This paper aims to identify factors affecting the cyclic response and limit states of coupled composite plate shear walls/concrete filled (CC-PSWs/CF). A statistical sensitivity analysis is performed using the Design of Experiments method. Finite element models of walls are developed and analyzed under cyclic loading. The accuracy of the finite element simulation is validated by using results from past experimental and numerical studies. The sensitivity analysis evaluates the effect of eight factors and their interactions on the lateral response of CC-PSWs/CF systems. Ten response parameters are considered, including the system initial stiffness, the onset of steel yielding in coupling beams and walls, the onset of compressive cracking of concrete in coupling beams and walls, coupling beam first and last steel yielding and plastic hinge in concrete, and the system lateral load capacity. The results show that the wall length is the most influential factor affecting all the response variables. The wall steel area ratio, steel yield strength, concrete compressive strength, wall thickness, and the coupling beam steel ratio and span-to-depth ratio affect at least four response variables.

A generation expansion planning method considering conditional value-at-risk

Abstract The uncertainty of load forecasting can lead to certain risks in generation expansion planning. Different from the traditional large-capacity unit planning in the past, renewable energy has the characteristics of small single-machine capacity and fast construction speed, etc. The uncertainty of load forecasting will have a more significant impact on the results of generation expansion planning including renewable energy. For this reason, this paper proposes a generation expansion planning idea considering load forecast uncertainty based on conditional value-at-risk (CVaR). Firstly, scenario technology is used to simulate the uncertainty, and CVaR is introduced to quantify the risk of generation expansion planning. Then, considering the coordinated development of traditional and renewable energy sources, a generation expansion planning model that considers risk is established to minimize the total costs. Finally, the effectiveness of the model was verified through a case study, and this model has reference significance for balancing the economy and reliability in generation expansion planning.

CRISPR-Based Modular Assembly for High-Throughput Construction of a UAS-cDNA/ORF Plasmid Library.

Functional genomics screening offers a powerful approach to probe gene function and relies on the construction of genome-wide plasmid libraries. Conventional approaches for plasmid library construction are time-consuming and laborious. Therefore, we recently developed a simple and efficient method, CRISPR-based modular assembly (CRISPRmass), for high-throughput construction of a genome-wide upstream activating sequence-complementary DNA/open reading frame (UAS-cDNA/ORF) plasmid library. Here, we present a protocol for CRISPRmass, taking as an example the construction of a GAL4/UAS-based UAS-cDNA/ORF plasmid library. The protocol includes massively parallel two-step test tube reactions followed by bacterial transformation. The first step is to linearize the existing complementary DNA (cDNA) or open reading frame (ORF) cDNA or ORF library plasmids by cutting the shared upstream vector sequences adjacent to the 5' end of cDNAs or ORFs using CRISPR/Cas9 together with single guide RNA (sgRNA), and the second step is to insert a UAS module into the linearized cDNA or ORF plasmids using a single step reaction. CRISPRmass allows the simple, fast, efficient, and cost-effective construction of various plasmid libraries. The UAS-cDNA/ORF plasmid library can be utilized for gain-of-function screening in cultured cells and for constructing a genome-wide transgenic UAS-cDNA/ORF library in Drosophila.

Analysis of a Prefabricated Beam Column Joint Component with Energy Consuming Steel Plates

Prefabricated structures have the advantages of short construction period, fast construction speed, and low environmental pollution. Based on this, a new type of prefabricated beam column node with energy dissipating steel plates is proposed. The structure mainly consists of prefabricated beams, columns, prefabricated energy dissipating hinge structures, etc. A finite element model is established for analysis and comparison with cast-in-place structures. It is found that the seismic performance of prefabricated beam column nodes with energy dissipating steel plates is better, and their displacement ductility and energy dissipation capacity are much higher than cast-in-place structures. A prefabricated frame structure system with energy dissipating steel plates is established to study its structural failure sequence.

An Innovative Retrofitting Technique of an Industrial Prefabricated Building Without Evacuation

This paper presents a seismic retrofit of an industrial-type precast reinforced concrete building structure using friction dampers. The project consisted of retrofitting two precast reinforced concrete buildings, one of which will be presented in this paper. Precast concrete is one of the industrial structures' most preferred construction methods due to its low cost, fast construction, and availability in rural areas. Unfortunately, most structures constructed before “Specification for Buildings to be Built in Seismic Zones(TBDY 2018)[5]” are not sufficiently engineered and are expected to perform poorly when exposed to a significant seismic event. The general characteristic of precast reinforced concrete buildings built before TBDY 2018 is their relatively high concrete quality (compared to cast-in-place reinforced concrete buildings) and better reinforcement workmanship. But they have some characteristic weaknesses as well. Weak beam-column connections, high drift ratios due to heavy beams, instability problems, and lack of frame behavior can be considered primary weaknesses. General classical retrofitting techniques include increasing beam/column sections or adding new reinforced concrete or steel members to the system or FRP(fiber-reinforced polymer) wrapping. Mostly classical retrofitting needs additional foundations. All these techniques require a long construction period, causing evacuation and stopping building usage. Because stopping the production cost can be tolerated by the owners, a retrofitting approach that can be assembled during the normal function of the industrial structures is required. As a result of this requirement, friction dampers are selected as the supplemental energy dissipation device. ASCE 41-17 [10] is employed for the building's damper design and performance evaluation. Before the damper study, some instability and weak connection problems are solved by traditional strengthening measures. The most effective damper configuration and capacities are selected after an iterative trial-and-error linear study using the simplified methods developed by PROMER. Nonlinear push-over analyses are conducted after linear prestudies. Finally, a nonlinear time-history analysis is performed for confirmation of the results. , It is shown that the proposed retrofit scheme satisfies the desired performance goals for both DBE and MCE events. Overall, it is considered that the proposed retrofit scheme with dampers provides the optimal solution for the Project stakeholders from a performance, design, constructability, and economic point of view. Some application photos will be presented, and methods will be explained in detail in the paper. The friction damper behavior is based on the rotational friction hinge concept. The dampers increase building damping, causing a decrease in earthquake demand. As a result, dampers provide passive energy dissipation and protect buildings from structural and nonstructural damage during moderate and severe earthquakes.

Experimental and numerical studies on the behavior of corrugated steel-sprayed ECC composite arches with full-shear-connection

This paper proposes a novel corrugated steel-sprayed ECC (CSSECC) composite arch, which possesses high load-bearing capacity and fast construction speed. To investigate the ultimate load-bearing capacity, composite effect, and key mechanical indices, five 6 m-span arch specimens were tested. A finite element model was developed, and parametric analysis was conducted. The results indicate that the ultimate load-bearing capacity and damping ratio of the CSSECC composite arch specimens can reach 3.4 and 6.5 times that of the corrugated steel (CS) arch, respectively, and increasing the ECC thickness significantly enhances the damping ratio. Both studs and epoxy resin contribute to the composite effect, but studs are more reliable than epoxy resin even though their design shear connection degree is the same at 1.2. Finally, a design method for the stability bearing capacity under axial compressive was proposed.

Fast, parallel, and cache-friendly suffix array construction

PurposeString indexes such as the suffix array (sa) and the closely related longest common prefix (lcp) array are fundamental objects in bioinformatics and have a wide variety of applications. Despite their importance in practice, few scalable parallel algorithms for constructing these are known, and the existing algorithms can be highly non-trivial to implement and parallelize.MethodsIn this paper we present caps-sa, a simple and scalable parallel algorithm for constructing these string indexes inspired by samplesort and utilizing an LCP-informed mergesort. Due to its design, caps-sa has excellent memory-locality and thus incurs fewer cache misses and achieves strong performance on modern multicore systems with deep cache hierarchies.ResultsWe show that despite its simple design, caps-sa outperforms existing state-of-the-art parallel sa and lcp-array construction algorithms on modern hardware. Finally, motivated by applications in modern aligners where the query strings have bounded lengths, we introduce the notion of a bounded-context sa and show that caps-sa can easily be extended to exploit this structure to obtain further speedups. We make our code publicly available at https://github.com/jamshed/CaPS-SA.