Storey Displacement Research Articles

Optimizing G+20 Multistorey Octagonal Building with Shear Wall and Floating Column

This paper examines a multistorey building with G+20 floors that is designed in a complicated octagonal shape. In contrast to normal structures, which usually consist of four-facing sides, the octagonal-shaped building has eight-facing sides and has the advantage of an open core in the center that allows for proper air circulation and natural light to be provided throughout the day. The G+20 storey building is complicated, with different kinds of irregularities at different levels in the floors. With floating columns that trigger the structure to have critical zones due to the discontinuity of the load transfer path leads to poor performance and boosted displacement in the building. This work focuses on the outcome compression of three models: model I is a straightforward, RC-framed building; Model II is a structure with floating columns; and Model III is a building with floating columns and a shear wall in the center. ETABS v2016 software has been utilized to perform response spectrum analysis to evaluate several characteristics including storey displacement and storey drifts. When comparing the models, model III has come up with a lesser storey displacement by 50% and more strength as compared to other models.

A novel approach for improving seismic characteristics of coupled primary-secondary structural systems

This study evaluates the primary-secondary structure interaction in three-dimensional single- and multi-story steel frame structures. A novel and practical approach was proposed to consider the effect of secondary systems. Additionally, a technique was developed to lower the time period of coupled structures. This is particularly helpful in high-rise buildings when exposed to earthquakes. Five types of steel frames were designed, fabricated, and subjected to seismic loading. The experimental models were exposed to ground motion excitations and the finite element models were subjected to nonlinear dynamic time-history analyses. An excellent agreement between the two approaches were observed. According to the results, infill wall displacements and accelerations were considerably reduced by utilizing the deformable wall setting. In this regard, the story displacements and accelerations decreased from 209 to 211 mm and 17,8 to 18,0 meter per square second when secondary systems were used. In addition, free vibrations of the frames were considerably reduced when the concentrated mass secondary systems were implemented.

Seismic Evaluation of RC Asymmetric Building Consisting of Floating Column and Passive Device

The abrupt slip on a fault that causes earthquakes causes the ground to tremble. Earthquakes have been happening frequently all around the planet over the past several decades. Nearly all earthquakes cause direct damage to the buildings, which results in the destruction of life and property. Due to lack of following structural guidelines which lead to collapse, so carried out modern seismic reduction techniques base isolation, shear wall, dampers, which helps in earthquake resistant structures for better performance during seismic events. The energy dissipation devices are easy to installed in existing or new building with low construction cost.So past studied has been done on fluid viscous damper, Tune mass damper, viscous damper with multi storied regular building. In present study comparing with fluid viscous damper in RC Asymmetric layout C & H shape having G+12storey building with consisting Floating column at alternative floor. Time-History analysis has been done by using two different earthquakes taken from PEER ground motion having high and low Pga value. To learn the analytical effects like change in Axial force, Bending moment of Floating column with fluid viscous damper at different location. Also, Optimization of Damper position has been carried out using parameters like storey displacement, storey drift, storey stiffness

Assessment of the influence of nonlinear soil effects on seismic response of RC structures with floating columns considering soil–structure interaction

Nonlinear dynamic properties of soil crucially influence structural responses during seismic events, highlighting the interdependence between soil and structural behavior. Incorporating soil–structure interaction (SSI) significantly increases structural vulnerability, especially in irregular conditions, compared to traditional fixed-base structures. Despite the emerging construction of reinforced concrete structures with floating columns in urban areas, their seismic performance, particularly when considering soil-structure interaction, remains largely unexplored. Therefore, this study aims to investigate the structural seismic response of mid-rise reinforcement concrete structures with and without floating columns situated on multilayered soil deposits, incorporating the effects of SSI. The nonlinearity of the soil materials was modeled using an isotropic hardening elastoplastic hysteretic constitutive model. A three-dimensional numerical investigation, employing finite element nonlinear time history analysis, was conducted to study seismic responses of structures under different configurations and base conditions. The results were presented as the ratio of structural responses with soil-structure interaction to fixed-base responses subjected to earthquake events. Structures with floating columns exhibited 1.43 times higher peak lateral storey displacement and 55% higher inter-storey drift ratio compared to those without, considering soil-structure interaction. The analysis results demonstrated a decrease in base shear values of up to 35% when accounting for SSI effects.

Moderating the Soft Storey Impact in Multi-Storey Buildings: A Comparative Seismic Investigation

A storey with lateral stiffness less than 70% of the storey above or less than 80% of the average stiffness of the three storeys above is considered a soft storey. Ground-floor open-air buildings are frequently used for parking, particularly in metropolitan settings with considerable space limits. Soft-story buildings with irregular stiffness tend to collapse more than conventional buildings. The study's main goal was to understand better the soft storey effect in multi-storey structures and how to mitigate it using strategies such as adding shear walls, bracings, viscous dampers, and stiffer columns. A G+14 storey building finite element model (FEM) has been established via ETABS software and performed Response Spectrum Analysis at three seismic zones-III, IV and V. To determine the best method for reducing the soft storey effect in buildings, an analysis is conducted taking into account many parameters, including storey shear, stiffness, storey drift, and storey displacement for the entire structure, as well as the responses at the soft storey level for different configurations. According to the findings, adding a shear wall to a soft-storey building increases storey shear while reducing maximum displacement and storey drift. The first floor of the structure (soft storey) exhibits the most significant reduction in displacement (79.29%) and storey drift (79.3%) when shear walls are incorporated at the corners. There is also a 33.11% increase in base shear at the first story level, and the structure's stiffness increases by 6.5 times compared to a soft storey building. Adding a shear wall reduces the soft storey building's maximum displacement and storey drift by 25.27% and 59.28%, respectively. The soft storey building's maximum storey shear rises by 33.38%. Regarding seismic performance, a soft-storey building with a shear wall performs better than other soft-storey mitigation techniques.

Pushover Analysis of a Reinforced Cement Concrete (RCC) Structure Incorporating Fibre-Reinforced Polymers to Address Vertical Irregularities

India has had four of the world's most destructive earthquakes in the past ten years, and our country is often rocked by earthquakes of low to moderate intensity. Since many buildings were severely damaged or collapsed, it has sparked debate whether framed constructions are sufficiently sturdy to withstand significant vibrations. As a result, the strength or ability of existing reinforced concrete structures to withstand seismic loads can be evaluated. The performance level of earthquake-prone buildings is evaluated using a performance-based design. One seismic technique for assessing a building's performance level is push-over analysis. It is possible to determine whether damage occurs at the member or structure level using pushover analysis. The study employs pushover analysis by Applied Technology Council (ATC) – 4), a seismic assessment technique, to evaluate the ability of 20-story buildings in seismic Zone III (with hard soil characteristics) to resist earthquake-induced forces. The primary objective was to assess the performance of structures reinforced with different fiber-reinforced polymer (FRP) materials, including aramid, glass, and carbon fibers, known for their high flexibility and strength in seismically active regions. To determine the best fiber-reinforced polymer configuration, the study considers the following parameters: pushover curve, target displacement, story shear, time period, maximum story displacement, and story drift based on pushover analysis independently. Through the pushover analysis method, the research discovers that FRP wrapping can significantly improve the seismic performance of reinforced concrete buildings. The findings aim to improve building design practices by recommending fiber-reinforced polymer configurations for better earthquake resistance, ensuring that future constructions are better equipped to handle seismic activity.

The application of ICPA optimization algorithm in multi-objective optimization structural design of prefabricated buildings

With the prefabricated buildings developing, traditional architectural design methods can no longer meet the requirements of efficient, green, and sustainable development. In view of this, based on the analysis of the framework structure of the cyclical parthenogenesis algorithm, the study introduced chaotic optimization algorithm for improvement. And the improved new algorithm was applied to multi-objective problems in the optimization design of prefabricated building structures. Finally, a novel structural design optimization model was proposed. These experiments confirmed that the improved algorithm had the least 160 iterations and 17 optimal solutions, which was an increase of 15 compared to traditional aphid algorithms. Two function solutions of this new structural design optimization model were both between –0:5 and 0.5, with relatively smaller values. In addition, this model could effectively optimize and transform physical buildings, increasing their structural stability by 2.43%, increasing their structural quality coefficient by 4.49%, reducing vibration cycles by 0.06%, and reducing inter story displacement angles by 0.04%. In summary, the improved cyclical parthenogenesis algorithm has good performance in solving multi-objective problems in prefabricated structures, and can quickly and accurately find the global optimal solution. This study aims to provide guidance for the prefabricated building structure design.

Analysis of SCWB Ratio on Collapse Probability of SRPMK Concrete Structures

The Bank Indonesia Medan Office, built in 1907, is an example of an old building requiring seismic resilience evaluation. This article investigates the impact of the Strong Column-Weak Beam (SCWB) ratio on the collapse probability of SRPMK concrete structures using spectrum response and linear time history analyses. Ground motions from Niigata (Mw 6.63), Tohoku (Mw 9.12), and Miyagi (Mw 7.15) earthquakes were utilized. Findings indicate that the existing structure does not meet seismic resilience standards per SNI 1726:2019 and SNI 2847:2019. Structural modifications are necessary with an SCWB ratio of 1.2 to ensure adequate seismic resistance. The analysis reveals that the largest inter storey drift and displacement occur during the Niigata earthquake, while the maximum base shear is recorded in spectrum response analysis. Performance evaluation of the structure shows that the collapse probability remains within the Immediate Occupancy (IO) level. This article underscores the critical role of the SCWB ratio in determining collapse probability and provides recommendations for structural design improvements.

Influence of Mass Irregularities on the Seismic Behavior of Multi-Storied Using STAAD.Pro Connect Edition

The seismic behavior of multi-story buildings is greatly influenced by their structural configuration. Irregularities in plan or elevation, particularly mass irregularities, are critical factors contributing to structural failure during earthquakes. Proper identification and management of such irregularities are essential to optimize a building's functionality and aesthetics. This study examines the seismic response of a G+14 reinforced concrete (RC) frame structure with and without mass irregularity. The analysis focuses on storey drift, storey displacement, lateral loads, maximum bending moments, and shear forces. A swimming pool placed on the 7th floor introduces a heavy mass, creating mass irregularity as per IS 1893 (Part 1):2016, where a floor’s seismic weight exceeds 150% of the floors above and below. Using STAAD.Pro Connect Edition software, the structures are analysed through dynamic response spectrum analysis. The residential building, with dimensions of 35.45 m × 30.56 m, is subjected to seismic loads according to IS code standards. Results indicate that the inclusion of mass irregularity significantly impacts the seismic response, leading to notable variations in drift, displacement, and internal force distribution. This study highlights the importance of addressing mass irregularities in seismic design to ensure structural safety and performance in earthquake-prone areas. Keywords: Mass irregularity, seismic response, RC frame, STAAD.Pro, storey drift, response spectrum, IS 1893:2016, dynamic analysis.

Static and Dynamic Analysis of Automated Car Parking Tower Systems

Background: Our country has dramatically evolved over the decades, and now we have a large number of well-connected roads, public buildings and a rising number of automobiles. With the passage of time, the manual car parking system in commercial spaces has become a stumbling block and wastes time. As a result, it requires a solution that can address these issues. Automated car parking systems are the answer to these issues. Methods: In this study, the static and dynamic response spectrum approach was used to analyze G+13 storey automated car parking by using ETABS-2018 systems Results: The storey displacement, storey stiffness, storey shear and overturning moment of steel and Reinforced cement concrete (RCC) automated car parking tower subjected to static and dynamic load for seismic zone III and zone IV in India have been determined. Conclusion: The RCC automated car parking tower was found to be not only stiffer but also lowered the displacement of construction.

Seismic analysis of vertically irregular RCC high-rise buildings: A study with provision of FVD at various locations

Abstract Irregular buildings are a significant part of urban infrastructure, often resulting from architectural, functional, and economic constraints. Among these, structures embracing vertical irregularities are predominantly receptive to dynamic loads, with earthquakes being the most damaging event. The dynamic forces acting on a structure during an earthquake generate vibrations and increase the energy within the structure. The primary role of a structure is to withstand these lateral loads and transmit them to the foundation. To enhance the seismic performance of such structures, various energy dissipation systems are employed to absorb and dissipate the released energy, thereby improving the building’s response to earthquake forces. This study focuses on the use of Fluid Viscous Dampers (FVDs) to dissipate energy from the structure. It involves a comparative analysis of effect due to inclusive and non-inclusiveness of fluid viscous dampers at various locations for Set-Back and Step-Back type vertical irregular high-rise buildings. The analysis aims to study key response parameters such as modal time-period, storey displacement, mode type, storey shear, torsional irregularity, and storey drift using ETABS software. The primary objective is to enhance understanding of the seismic behaviour of high-rise reinforced concrete structures with vertical irregularities and Fluid Viscous Dampers (FVDs) at different locations.

A Comparative Study on Seismic Behaviour of Plan Irregular Buildings

Abstract: Asymmetrical plan irregularities occur when the horizontal layout of a building is non uniform or unsymmetrical in one or more axes. These irregularities may arise from variations in building shape, size, or configuration, leading to nonuniform distribution of mass, stiffness, or load paths throughout the structure. Considering equivalent static analysis (ESA) and response spectrum analysis (RSA) as per IS 1893-Part 1 (2016) considering seismic zones III, structure with square shaped plan performs better than the other shaped models (viz. T, L, H and Plus shapes) with least values of storey displacement and storey drift ratio, and also with higher value of storey stiffness. Thus, square plan shaped structure is seismically more resistant than T, L, H and Plus shaped structures.

Seismic behavior of base isolated precast frame

Seismic behavior of base isolated precast frame

Comparative Study of Tube-In-Tube and Bundled Tube System in High Rise Buildings

This study evaluates the seismic performance of Tube-in-Tube and Bundled Tube structural systems for high-rise buildings, following IS 1893 standards. Key parameters, including storey displacement, drift, and shear, were assessed in Seismic Zones 3 and 5. In Seismic Zone 5, the Bundled Tube system reduces storey displacement by about 33% compared to the Tube-in-Tube system. Similarly, in Seismic Zone 3, displacements are lowered by 21-24%. The Tube-in-Tube system exhibits higher storey drift, particularly in Seismic Zone 5, where the Bundled Tube system offers a remarkable 85% reduction. In Seismic Zone 3, this reduction ranges from 45-50%. In terms of storey shear, the Bundled Tube system consistently outperforms the Tube-in-Tube system, reducing shear forces by 24-30% across both seismic zones. Overall, the Bundled Tube system proves to be more effective under seismic conditions, minimizing displacements, drifts, and shear forces, making it the superior choice for high-rise structures in earthquake-prone regions. This improvement in performance contributes to safer structural designs in compliance with IS 1893 standards.

Analysis of G+20 Horizontally Connected Buildings with and Without Fluid Viscous Dampers

As urban populations continue to grow globally, the demand for new cities and high-rise structures is increasing due to limited land resources and expanding social and commercial activities. To address these challenges, this study investigates the seismic performance of G+20 horizontally connected buildings, focusing on the effects of fluid viscous dampers (FVDs) on structural response. A 3D model of two G+20 buildings, one with and one without FVDs, was developed using ETABS software, and seismic analysis was conducted for a Zone V seismic region in India. The study evaluates key performance parameters, including storey displacement, storey drift, and storey shear, to assess the effectiveness of the dampers. Results showed that adding FVDs significantly reduced overall building displacement, particularly in the X-direction at the top storey, with a reduction of approximately 40%. The Y-direction saw a more modest 5% reduction, attributed to geometric and stiffness irregularities. Additionally, storey drifts in the X-direction were higher than in the Y-direction but were significantly reduced after installing dampers. The findings highlight the importance of FVDs in improving the seismic resilience of horizontally connected high-rise buildings and offer valuable insights for future structural design in earthquake prone areas.

Seismic isolation strategy via controlled soft first story with innovative multi-stage yielding damper: Experimental and numerical insights

Seismic isolation strategy via controlled soft first story with innovative multi-stage yielding damper: Experimental and numerical insights

Seismic response control of shear frame structure using a novel tuned-mass type composite column

Seismic response control of shear frame structure using a novel tuned-mass type composite column

Progressive Collapse Analysis of G+10 RCC Building

This study important of the progressive collapse that final damage of the structure is not similar as the initial collapse of structure. The key parameters used story displacement in eleven-storey building of regular shape that has modelled and analyzed by the ETABS 2018 software by using the Indian standard codes. Then for the calculation of progressive collapse we use U.S General Service Administration (GSA 2016) guidelines. The demand capacity ratio (DCR) values of the neighboring member are taken into account after the damage the DCR values for regular structure must be with in (2). In this study the progressive collapse is considered in three different cases that is at corner, interior and at exterior columns.

Seismic isolation design of high-rise shear wall structures in high-intensity areas

Taking a shear wall structure in a high-intensity area of 20 floors as an example, the seismic reduction scheme of the structure was determined, and the Etabs software was used to conduct time history analysis on the seismic and non-seismic structures. The floor shear force, overturning moment, and short-term surface pressure of the isolation support were obtained. The results showed that under frequent earthquake action, the average maximum floor shear force in the X direction of the isolated upper structure was only about 28 % of that of the non-isolated structure. The maximum inter story shear ratio was 0.34, and the maximum floor shear force in the Y direction was only about 25 % of that of the non-isolated structure. The maximum inter story shear ratio was 0.31. The average maximum overturning moment of the upper structure in the X direction after isolation is about 30 % of that of the non-isolated structure. The maximum overturning moment ratio is 0.36, and the average overturning moment of the maximum floor in the Y direction is about 22 % of that of the non-isolated structure. The maximum overturning moment ratio is 0.26. Under rare earthquake action, the maximum inter story displacement angles in the X and Y directions of each floor of the seismic isolation structure are 1/302 and 1/446, respectively. The maximum surface pressure value of the isolation bearing under rare earthquake is 28.9 MPa, the minimum surface pressure value is 5.58 MPa, and the maximum displacement is 579 mm, which meets the requirements of the specifications. Overall, the seismic performance of the seismic isolation structure is good, and the isolation scheme is feasible.

Effect of Vertical Aspect Ratio on Mass, Stiffness and Vertical Geometric Irregular Structures

Occurrence of earthquake will highly damage the structures which are not modelled and designed to resist such loads it may cause sometimes the collapse of structures leads to loss of human lives. The size of the building and slenderness ratio are the important factors for the efficient structural design. The aspect ratio of buildings is considerably effects under seismic loads. It is important to know the influence of aspect ratio on the irregular structures in high seismic zone areas. The research has been performed on the 15 storey building frames of five cases with mass, stiffness and vertical geometric irregularities. Each case comprises of four models having various vertical aspect ratios. The purpose of this study is to investigate the influence of vertical aspect ratio on mass, stiffness and vertical geometric irregular structures and how the structure will vary under seismic loads. The irregularities are incorporated in to the buildings by increasing the loads and column height in particular storeys and by eliminating the columns and beam sections compared to adjacent storeys. Linear dynamic analysis is performed. It is observed that with the decrease of vertical aspect ratio the structural response will increases the response of storey displacement, base shear, storey drift and over turning moment in the cases of mass and stiffness irregular structures. In the case of vertical geometric irregular structures with the decrease of vertical aspect ratio the storey displacement and storey drift values decrease for all the models, the base shear, overturning moment and stiffness increases with the decrease of vertical aspect ratio. Key words: Mass irregularity, Stiffness irregularity, Vertical geometric irregularity, Vertical aspect ratio, Linear dynamic analysis.