Super High Rise Research Articles

Optimization Analysis of Water Supply Mode for Fire Protection System of Super High Rise Building

Abstract In order to improve the applicability and reliability of the fire water supply capacity of super high-rise buildings, the fluid analysis software Flomaster was used for simulation. Through the existing pumps, valves, pipelines, pressure reducing valves and newly developed fire hydrants and other components, the fire water supply system of super high-rise buildings is modeled. The pressure distribution of the system pipe network under a given fire water supply mode is studied. The research shows that the simulation can analyze whether there is excessive pressure in the fire hydrant system under different flow conditions in the actual fire extinguishing process. This paper simulates the actual fire extinguishing process of the fire hydrant system through a specific engineering case. The pressure distribution and flow distribution under different flow conditions are obtained. The excessive pressure position of the fire pipe network system under the given fire pump model is obtained. It provides a method for guiding the selection of fire pump and the design of fire hydrant system pipe network. It has certain guiding significance for the subsequent optimization of the design scheme of the fire water supply network and the prediction of the performance of the R&D equipment.

Seismic Fragility Analysis of a Multi-Tower Super High-Rise Building Under Near-Fault Ground Motions

ABSTRACT Earthquake damage to engineering structures often occur in near-fault areas. Near-fault ground motion is characterized by high-energy velocity pulses, long action period, and strong destructiveness. This paper forces on the seismic analysis of a multi-tower super high-rise building that subjected to near-fault ground motions. The interactions between each tower makes the internal forces and dynamic responses much complex and totally different from single-tower super high-rise buildings. However, currently, multi-tower buildings in China are usually regarded as multiple single-tower buildings, and then separately designed based on the relevant provisions in seismic code for single-tower buildings. The mutual influence between the towers is almost not taken into account. Seismic response history analysis was carried on a three-tower super high-rise building using finite element method. Various near-fault and far-fault ground motions and high-energy velocity pulses were used as inputs. Through calculation of inter-story drift ratio and maximum displacement, the quantitative seismic fragility analysis was conducted for the main tower and sub-tower structures. The results show that the responses from near-fault ground motions to the structure are much greater than those from far-fault ground motions. The damage probabilities of various damage levels for near-fault ground motions are 12.5% higher than far-fault ground motions averagely. A further analysis reveals that the velocity pulses are the main factor causing structural damage in near-fault ground motions.

Finite Element Analysis of Seismic Performance of RCS Hybrid Joints of Steel Hoop Structure

Reinforced concrete column-steel beam (RCS) composite structures are widely used in super highrise buildings due to their excellent performance. In this paper, the numerical simulation analysis of the RCS hybrid joints of “beam through” and “column through” RCS constructed with steel hoop structure are carried out, and the influence of five different parameters, i. e. , flange width-thickness ratio, steel yield strength, axial compression ratio, concrete strength and end plate thickness, on the seismic performance and failure mode of RCS hybrid joints is investigated. The results show that the ABAQUS finite element model can simulate the performance of RCS mixing under static load through reasonable parameter settings, which is in good agreement with the experimental results. Under the mechanism of “strong column and weak beam”, the combined node firstly undergoes beam-hinge damage, and the change of the axial compression ratio and the concrete strength parameter of the joint have little effect on the ultimate bearing capacity and deformation performance of the joint. Increasing the flange width-thickness ratio reduces the bearing capacity of the joint by up to 11%, and increases the yield strength of the steel, and increases the bearing capacity of the joint by 36. 4%. The thickness of the end plate of the column through specimen is increased, and the bearing capacity and deformation performance of the joint are improved to a certain extent. The changes of each parameter have no significant effect on the final plastic hinge failure mode of the joint. The research in this paper provides theoretical support for the design and research of this type of node in the future.

Retracted: Simulation Study on the Influence of Fire Partition on Curtain Wall Temperature in Super High-Rise Buildings in China

Retracted: Simulation Study on the Influence of Fire Partition on Curtain Wall Temperature in Super High-Rise Buildings in China

Building a one level 3D control network ensure the geodetic work in high-rise building construction

Super high-rise buildings are being built more and more in the world and in Vietnam. Currently, foreign experts are presiding over most of the geodetic work during the construction of super high-rise buildings in Vietnam. Vietnamese technicians are only allowed to participate in the implementation at the request of these experts. Therefore, in Vietnam, it is necessary to have a full research on geodetic work in the process of building super high-rise buildings. This article presents the research results of a group of lecturers in the Geodetic Department, Hanoi University of Civil Engineering on the ability to combine terrestrial and satellite measurements, which are measured by total station and GNSS, in geodetic work when building super high-rise. The research results are the process of building and data processing one-level spatial networks, determining three-dimensional coordinates in a unified coordinate system, step by step ensuring accuracy throughout the construction process, exploiting super high-rise buildings.

Retracted: Simulation Study on Fire Visibility of Typical Floor Planes of Modern Super High-Rise Office Buildings in China

Retracted: Simulation Study on Fire Visibility of Typical Floor Planes of Modern Super High-Rise Office Buildings in China

Optimization Analysis of Key Technologies of Super High-Rise Buildings with Soft Soil Foundation

The frequency of super high-rise buildings has gradually increased in larger cities. Compared with ordinary buildings, super high-rise buildings involve more difficult technologies of construction. Soft soil foundation is one of the unfavorable foundation types for engineering construction because of its high sensitivity and low bearing capacity. Therefore, the combination of super high-rise buildings and soft soil foundations will greatly increase the insecurity of the project. Although related methods of soft soil treatments have been proposed and optimized in recent years, there is still a lack of targeted construction methods combing for super high-rise buildings, which is of vital significance to improve the safety and efficiency of future construction projects. Based on the case analysis of Jinmao Tower, Shanghai World Financial Center and Shanghai Tower in the Lujiazui zone, this paper summarizes the optimization of key technologies of super high-rise buildings under the background of soft soil foundation. The author hopes to provide a clear reference for future projects by systematically sorting out the construction projects in this typical area.

Research on Technological Innovation of Super High-rise Buildings

As China enters a new era of socialism, the economy is developing at a high speed, and the urban population density is increasing rapidly. The development of cities is facing the problem of land shortage. Therefore, the development of super high-rise buildings has become an inevitable means of urban development and construction. However, the construction of super high-rise buildings is difficult and complicated, and there are many factors need to be considered. If the construction technology, structural design method and materials adopted in the construction process are too old or inappropriate, it will cause unnecessary economic losses and even potential safety hazards. Therefore, it is urgent to summarize and find more novel and appropriate construction methods for super high-rise buildings in China. In this paper. the literature method is used to discuss and explore the structural design, material selection and construction technology of super high-rise buildings. The results summarized can provide references for designers and engineers.

Construction Temperature Control Technology of Super High-rise Mass Concrete Foundation Raft

Construction Temperature Control Technology of Super High-rise Mass Concrete Foundation Raft

Research on Key Technology of Super High-rise Building Survey

Research on Key Technology of Super High-rise Building Survey

Investigation on the Performance of Partial Penetration Welds in Multicell Concrete Filled Steel Tubes

This paper presents an experimental and analytical investigation on the performance of partial penetration welds used to adjoin steel plates in irregular shaped multicell concrete filled steel tubes. The experimental program of this study is designed based on an actual implementation of such members as mega columns in a super high rise building in China. A total of six specimens are designed with different plate arrangements for the purpose of testing the performance of the partial penetration welds at different locations of the specimen. The designed specimens are tested under different load procedures and directions; this is achieved by placing them in vertical and slantwise manners between two loading plates which impose monotonic and cyclic actions. The failure conditions of each of the tested specimens are presented and discussed in detail and are based on the conclusions drawn from the experimental observations; the partial penetration weld at the corner of the tested specimens is found to be the most vulnerable. To facilitate large scale analysis, a finite element model constructed by the finite element analysis program ABAQUS is verified against experimental results. The evaluation of the stress at the partial penetration welded corner is carried out following an empirical procedure, which is adopted due to the complexity of the problem domain. The adopted procedure consists of two steps: the first one is to initially evaluate the stress based on an existing method in the literature, and the second one is to fit the results of the initial evaluation with the finite element model results based on parametric and regression analysis. After performing regression analysis, a formula to predict the weld stress is concluded, and the results of the proposed equation are found to be satisfactory when compared with the finite element model results.

Research on vertical deformation and predeformation control of three‐tower connected super high‐rise structure during construction

SummaryConnected super high‐rise structure has a long construction period and significant time‐dependent characteristics, so it is necessary to study its vertical deformation during construction. Taking an asymmetrical three‐tower conjoined super high‐rise structure as engineering background, the equivalent elasticity problem was analyzed by age‐adjusted effective modulus method, and vertical deformation formula was deduced. A simplified model and a refined model of structure were established. The correctness of the deformation formula and modeling had been proven by comparing the dynamic characteristics and numerical simulation results. Based on the simplified model, the optimal construction plan of the conjoined super high‐rise structure was discussed. Based on the deformation formula, the predeformation calculation method of the conjoined super high rise was studied, and the correctness was verified by numerical simulation. The results show that the largest vertical deformation of the connected structure occurs at the position of corridor, and an apparent mutation occurs here. Properly delaying the rigid connection timing between corridor and tower is beneficial to the control of the overall structural deformation difference and internal force. The predeformation analysis method proposed in this paper is correct and effective, which could offset the vertical deformation of the structure during the construction sequence.

Brief Analysis of Electrical Automation Equipment Installation Project Management of Super High-rise Building

Brief Analysis of Electrical Automation Equipment Installation Project Management of Super High-rise Building

Analysis of Design Characteristics of Intelligent System for Super High Rise Building Based on BIM Technology

The design and construction of super high-rise building is a very complex system engineering, which not only involves the intersection and integration of many disciplines and fields, but also involves the management of personnel in various disciplines and fields. Traditional system design and building mode are difficult to effectively support the intelligent design and construction of super high-rise buildings. Based on this, this paper first analyses the concept of BIM Tech and its application characteristics in super high-rise building engineering, then studies the application of BIM Tech in the intelligent system design of super high-rise buildings, and finally gives the design and analysis of intelligent system of super high-rise buildings based on BIM Tech.

Construction technology of super high rise ultra-thin shear wall bearing heavy tonnage tower crane under energy saving and emission reduction

Lanzhou·Famous City Plaza Project There are two internal climbing boom tower cranes in the core tube of 1# building. From the 50th floor, the thickness of shear wall is reduced to 200mm, and the design wall thickness and reinforcement can not meet the stress requirements of boom tower cranes. Through the finite element analysis software ANSYS simulation analysis, the core tube shear wall and coupling beam are strengthened, the reinforcement is increased, and the concrete strength grade is improved. At the same time, the steel beam of the boom tower crane is reinforced to reduce the load borne by the shear wall, and then the seamless steel pipe and jack are used to push back the load of the steel beam from the bottom, which solves the problem of insufficient bearing capacity of the ultra-thin shear wall to the boom tower crane, makes the boom tower crane work normally, and ensures the construction safety and the construction period.

Simulation Study on the Influence of Fire Partition on Curtain Wall Temperature in Super High-Rise Buildings in China

The poor fire resistance characteristic of super high-rise curtain wall makes the curtain wall design one of the main approaches to improve its capacity for prevention and control over fire and smoke spread. The propagation of smoke leads to the increase in the temperature of the curtain wall on the upper and lower floors of the fire floor and consequently leads to glass fracture and other serious consequences. Current codes have control over fire resistance performance and size of fire partition materials but do not include requirements on the position of curtain walls on floors. By changing the position of fire partition in curtain walls, the paper carries out three comparative simulation experiments on two forms of fire partition: spandrel and fire prevention cornice. Besides, PyroSim is used to calculate the comparative simulation of fire and smoke spread and obtain the data on temperature variation nephogram and monitoring points in the center line of glass curtain walls during different fire scenarios, so as to discuss the influence of different positions of spandrels and fire canopy on fire hazard and smoke. This study finds out the following: fire canopy can better prevent the longitudinal spread of fire smoke than spandrels. The fire canopy above spandrels can reduce the flue-gas temperature. The higher the spandrels above floors, the faster the temperature of the central lines of glass curtain walls above fire floors reduced. However, the higher the spandrels above floors, the more uneven the distributions of high-temperature regions and low-temperature regions, thus leading to the increase in horizontal temperature differences of glass panels. This research conclusion can be taken as a reference for fire protection design of super high-rise glass curtain wall.

Application of Key Technologies for Multi-Terminal Change of Frame-Double Core Tube Super High-Rise Building

Frame-double-core tube structure is a structural form suitable for super high-rise buildings with long or irregular standard floor plan. In this paper, the structural arrangement and structural member size of the double core tube are determined through the analysis of structural indexes such as stiffness calculation and torsion effect under rare earthquake. At the same time, through the research of all-steel climbing frame and aluminum formwork under the condition of super high-rise height and structural change, the application of all-steel climbing frame and multi-end aluminum formwork with super high-rise height change are solved, which speeds up the construction progress, greatly reduces the safety and quality risks in the construction process of super high-rise buildings, and at the same time, reduces the material and labor costs to meet the development requirements of green construction.

Research on the Application of “Compensation Effect” in the Design of Urban Super High-Rise Buildings Based on Big Data

With the development of urbanization, more and more super high-rise buildings are put into use. Big data research shows that in order to reduce the disadvantages of super high-rise buildings, meet the needs of people for the natural environment and relieve the physical and mental needs, more and more super high-rise buildings apply compensation effect in the design process. This paper first analyzes the adaptability of super high-rise buildings to compensation effect, then studies the composition of compensation mode of urban super high-rise buildings, and finally gives the design and implementation of urban super high-rise buildings based on compensation effect[1-3].

Simulation Study on Fire Visibility of Typical Floor Planes of Modern Super High-Rise Office Buildings in China

With the development of office forms, the space form of super high-rise office buildings changed from the unitary efficient office space to a complex space that integrated office, communication, and experience, which also diversified the design of typical floors in the office zone. However, from the perspective of fire prevention, the placement of shared space changed the form of the plane in typical floors in the office zone, affecting the smoke spreading of fire and paths of personnel evacuation. Hence, the subject on the planar relationship among high-rise office buildings based on fire prevention analysis, which optimizes space design, is worthy of discussion. After collecting many cases of super high-rise office buildings in China, this study categorized them into six typical planes and adopted the software PyroSim for comparative simulation of the smoke spreading of fire. By comparing the visibility of different zones in fires, this study analyzed the effects of the area of the office zone, the location of the atrium, and the form of the plane on the fire visibility on the typical floor and put forth the key factors that influence fire visibility, thus optimizing the plane design of the typical floor of super high-rise buildings. The findings show that in the six fire scenes, the area of the office zone is between 1136m2 and 1736m2. The peak of duration for visibility decline at 1.5 m appeared in Scene 3. Its office zone is 1536m2, and the duration of visibility decline is greater than 1000 s. In other fire scenes, the duration of visibility decline is less than 300 s. By comparing the plane arrangement features of the fire scenes, the paper concludes that in a given fire scene, establishing an atrium in the office zone, expanding the length of the adjacent edge between the atrium and the office zone, and building an evacuation corridor between the atrium and the core tube can greatly extend the effective evacuation time. This can serve as reference for the plane design of super high-rise office buildings.

Seismic control of super high‐rise structures with double‐layer tuned particle damper

AbstractEnergy dissipation is an important method for improving the seismic performance of super high‐rise (SHR) structures. However, few quantitative studies have focused on new energy dissipation methods and their application in SHR structures, especially for those under long‐period ground motion, including near‐fault pulse‐type (NFPT) ground motion. Thus, in this study, a 1/20‐scale model of a typical SHR structure was designed and manufactured, and various earthquake waves were selected based on the site condition of the structure, such as non‐long‐period (NLP) ground motion, non‐pulse‐like long‐period (NPLP) ground motion, and NFPT ground motion. Then, a double‐layer tuned particle damper (DTPD) was fabricated, its parameters were optimized, and a design method was proposed. Finally, a series of shaking table tests were performed on the scaled model with and without DTPD. The results indicated that the dynamic responses were much greater under NPLP and NFPT than under NLP ground motion. The dynamic responses of the SHR structure were more evident when the value of velocity pulse period was close to that of the natural vibration period of the SHR structure. Moreover, the top floor of the SHR structure clearly exhibited whipcord phenomenon under NPLP and NFPT ground motions. DTPD can effectively decrease the dynamic response of SHRs. The damping performance of the DTPD under NPLP and NFPT was better than that under NLP ground motion. In addition, a smaller damping ratio at the connection between the DTPD and the structure induced a better damping performance from the DTPD.