Pushover Analysis of Base Isolated RC Frame Buildings With Masonry Infills

2019 ◽  
Vol 10 (2) ◽  
pp. 18-31
Author(s):  
Radhikesh Prasad Nanda ◽  
Subhrasmita Majumder
Keyword(s):  
Base Isolation ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
Base Shear ◽  
Infilled Frame ◽  
Masonry Infills ◽  
Time Period ◽  
Frame Buildings ◽  
Story Drift ◽  
Rc Frame Buildings

In the present article, the performance of base-isolated infilled frames is studied analytically. The seismic performances of four RC buildings, namely RC bare frame without isolator, RC bare frame with isolator, RC infilled frame without isolator, and RC infilled frame with isolator are analysed. The results show a decrease in base shear value and increase in time period due to base isolated buildings, while these parameters are reversely affected due to infills. The decrease in story drift for the base isolated buildings is in phase while considering infill. Also, it can be inferred that plastic hinge formation is greatly affected by the introduction of masonry infill. Hence, relying on base isolation without considering infills may underestimate the seismic performance.

scholarly journals RCC Highrised Residential Buildings its Influence on Earthquake Loads

2020 ◽  
Vol 184 ◽  
pp. 01107
Author(s):  
Y. Kamala Raju ◽  
G.V.V. Satyanarayana ◽  
G. Arun Sai
Keyword(s):  
Residential Buildings ◽  
Response Spectrum ◽  
Software Tool ◽  
Wind Loads ◽  
Base Shear ◽  
High Rise ◽  
Frame Buildings ◽  
Present Decade ◽  
Earthquake Load ◽  
Rc Frame Buildings

The present decade, high rise multi-storey buildings are subjected to many external effects such as earthquake, wind loads, tidal loads, etc., in most cases high rise buildings have more vulnerable to earthquake and wind loads. Most of the reinforced concrete multi-storeyed frame buildings were heavily damaged and many of them completely collapsed during due earthquakes. RC frame buildings were severely damaged due to various deficiencies when proper codal provisions are not designed. A study is need to study the behaviour of the RC framed structure under earthquake load to reduce the damage caused by earthquake forces In this investigation a RC framed building of G+20 storeyed is considered in several seismic zones under different soils as per Indian Standard code IS 1893(part1):2016, using STAAD. Pro V8i as software tool. Finally evaluate the ultimate Base shear using Equivalent static method and Response spectrum method addressing under design forces.

Research on Seismic Damage of Buildings in the Beichuan Earthquake

2014 ◽  
Vol 580-583 ◽  
pp. 1613-1617
Author(s):  
Fan Wang ◽  
Chen Ning
Keyword(s):  
Seismic Design ◽  
Plastic Hinge ◽  
Seismic Damage ◽  
Rc Frame ◽  
Analysis Software ◽  
Element Analysis ◽  
Frame Buildings ◽  
Rc Frame Buildings ◽  
Component Failures ◽  
Beichuan County

This paper mainly discusses seismic damage of RC frame buildings in Beichuan county based on the investigation on the spot. The building damage forms are classified and component failures are analyzed. Applying finite element analysis software, the performance of RC frame buildings under severe earthquake is simulated and the components plastic hinge development is researched. The analysis results are made a comparison with real damage of buildings in this paper and some suggestions are proposed to seismic design.

scholarly journals Assessment of plastic hinge in RC structures with and without shear walls applying pushover analysis

2020 ◽  
Vol 1 (1) ◽  
pp. 11-18
Author(s):  
Jean Pierre Lukongo Ngenge ◽  
Abdallah M. S. Wafi
Keyword(s):  
Plastic Hinge ◽  
Pushover Analysis ◽  
Computer Software ◽  
Shear Walls ◽  
Span Length ◽  
Base Shear ◽  
Rc Structures ◽  
High Rise ◽  
Moment Resisting Frames ◽  
Moment Resisting

This paper gives a brief presentation about different types of analysis, plastic hinge, moment-resisting frames (MRFs) and shear walls (SWs) in reinforced concrete (RC) Structures. ETABS computer software is employed to model and analyse the structures applying the pushover. The performances of the modelled structures are also evaluated considering different parameters such as the number of stories, spans length, shear walls, reinforcement yield strength and characteristic strength of concrete. The study includes two cases, which are moment-resisting frames with and without shear walls (i.e. MRFs and MRF-SWs, respectively). Each case covers low-, mid- and high-rise buildings. In this regard, a comparative study has been performed for the results obtained from all models. It was observed that the stiffness of MRFs compared to MRF-SWs was less and also the stiffness of low-rise frames was higher than that of mid-rise and high-rise frames. Technically this means that a low-rise building is stiffer than a mid-rise building and a mid-rise building is stiffer than a high-rise building. Additionally, when the span length increases, the stiffness of the building decreases. Therefore, it can be concluded that the span length is inversely proportional to the stiffness. Finally, all stiffness values were calculated taking into consideration the displacement and base shear at the first hinge formation on the pushover curve of each model.

scholarly journals Seismic Performances of Conventional and LRB-Isolated Buildings Comparing to Seesaw Buildings

2020 ◽  
Vol 10 (1) ◽  
pp. 45-54
Author(s):  
Soroush Kherad ◽  
Mahmood Hosseini ◽  
Mehrtash Motamedi
Keyword(s):  
Base Isolation ◽  
Low Cost ◽  
Time History ◽  
Building Structure ◽  
Base Shear ◽  
Isolation System ◽  
Repair Work ◽  
Story Drift ◽  
Base Isolation System ◽  
Nonlinear Time History

AbstractUsing seesaw structural system equipped with energy dissipating devices has been considered as a low-cost and low-tech way for creation of earthquake-resilient buildings. In this paper by considering three groups of multi-story buildings, including conventional buildings, LRB-based isolated buildings and building with seesaw structure, equipped with a newly introduced type of structural fuses, their seismic performances have been compared through nonlinear time history analyses (NLTHA). The employed fuses in seesaw buildings are a specific type of yielding plate dampers, called Multiple Curved Yielding Plate Energy Dissipater (MCYPED), installed at the bottom of the all circumferential columns of the lowest story of the building. To show the efficiency of the proposed seesaw system in comparison with other two mentioned groups, first, by finite element modeling, verified by experimental results, the initial and secondary stiffness values as well as the yielding and ultimate strengths of the MCYPEDs have been obtained to be modeled by multi-linear plastic springs in the seesaw buildings. Then, a series of NLTHA have been performed on the three groups of buildings by using a set of selected earthquakes. The compared responses include roof displacement and acceleration, base shear, inter-story drift and finally plastic hinges (PHs) formed in the building’s structures. Results show that the proposed seesaw building equipped with MCYPEDs not only results in lower seismic demand, similar to base isolation system, but also leads to remarkable energy dissipation capacity in the building structure at base level, so that the building structure remains basically elastic, and does not need any major repair work, even after large earthquakes, contrary to the conventional building which need to be demolished after the earthquake.

scholarly journals Seismic Performance Evaluation of Multi-Storey Building Having Soft Storey With Different Location of Shear Walls

2020 ◽  
Vol 9 (11) ◽  
pp. 50-55
Keyword(s):  
Shear Walls ◽  
Base Shear ◽  
Soft Storey ◽  
Seismic Performance Evaluation ◽  
Soft Story ◽  
Time Period ◽  
Multistory Building ◽  
Story Drift ◽  
Seismic Behaviors ◽  
Storey Building

Present scenario growth of Multistory building is incredibly high attributable to fast growth everywhere around the globe. Open first story is usually provided for congested parking space, reception lobbies, party areas or any purpose in multistory building. However just in case of multistory building with soft story provides reduced performance. There are numerous aspects that effects on the behavior of multistory building like irregular plan within the structure. In the present work, study of various locations of weak stories is being considered for the analysis. To study of various locations on the seismic behavior of multistory building, linear static analysis (ESA) and linear dynamic analysis (RSA) in ETABs 2016 version is applied. Some seismic constraints like time period, story shear, story displacement, story drift and base shear are tried. The seismic behaviors of multistorey building with soft stories are administered.

scholarly journals Analysis of Multistory Buildings With Stub Column In Different Seismic Zones In India – A Review

2022 ◽  
pp. 44-49
Author(s):  
Somasundhara Naathan M ◽  
Dr Ramadevi K
Keyword(s):  
Seismic Analysis ◽  
Pushover Analysis ◽  
Seismic Load ◽  
Base Shear ◽  
Software Analysis ◽  
Multistory Buildings ◽  
Seismic Zones ◽  
Story Drift ◽  
Stub Column ◽  
Stub Columns

Construction of building requires proper planning and management. Buildings are subjected to various loads such as dead load, live load, wind load and seismic load. Seismic load has extreme adverse effect on building so it is necessary to perform seismic analysis. This paper explains about the response of building when it is subjected to seismic load, this response can be shown by story drift and base shear. Behavior of buildings with stub columns is analyzed and the results are compared with buildings without stub columns. Seismic analysis has been performed on (G+7) buildings located in seismic zones 2,3,4&5 using ETABS software. Analysis has been performed according to IS 1893:PartI (2002).The storey drift and design base shear are evaluated and compared. Pushover analysis was performed and the results were compared.

scholarly journals Evaluation of elastic stiffness factor of 2D reinforced concrete frame system with different parameters

2021 ◽  
Vol 2 (2) ◽  
pp. 26-31
Author(s):  
Omar Ahmad
Keyword(s):  
Reinforced Concrete ◽  
Lateral Displacement ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
Shear Walls ◽  
Elastic Stiffness ◽  
Span Length ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Plastic Hinges

In general, the buildings are designed based on the applied loads on them, and these buildings generally have elastic structural behaviour. However, these structures may be subjected to unexpectedly strong seismic forces that exceed their elastic limits. In order to find the rigidity and load-bearing trend of the building without the formation of plastic hinges and failure, pushover analysis should be performed. Pushover analysis is a non-linear static analysis in which the structure is subjected to lateral loads, so some parameters are recorded, such as failure, formation of plastic hinges, and yield. The elastic stiffness factor is the ability of a building to bear the loads on it before the failure and existent of the plastic hinges. In this study, pushover analysis had been done on 12 two-dimensional reinforced concrete frames with a different number of stories, different span lengths and with or without shear walls to find the effect of the span length, shear wall and the number of stories on the elastic stiffness factor. After performing the pushover analysis, the elastic stiffness factor had been evaluated from the pushover curve by dividing the base shear over the lateral displacement at the first point of the occurrence of the plastic hinge. The results obtained from the study showed that the elastic stiffness factor increases with the increase of the span length, while it decreases with the increase of the number of stories. As well, the frames with shear walls are stiffer than the frames without shear walls.

scholarly journals Performance Behavior of Eccentrically Braced Steel Frame under Seismic Loading

2019 ◽  
Vol 8 (9S) ◽  
pp. 1077-1090
Keyword(s):  
Seismic Event ◽  
Pushover Analysis ◽  
Lateral Force ◽  
Steel Frame ◽  
Braced Frames ◽  
Base Shear ◽  
Eccentrically Braced Frames ◽  
Load Effect ◽  
Story Drift ◽  
Bracing System

Recent past growth of multi-story buildings structures with emphasis on steel has been found satisfactory. For solving the better-quality accommodation in the region where the chances of earthquakes are likely, role of bracing system enhances the performance of building under lateral load effect of earthquakes. Various methods of bracing systems are available in practices however, eccentrically braced frames (EBFs) are fairly new lateral force resisting system established to resist seismic event in a probable manner. Properly designed and detailed EBFs perform in a ductile manner through shear or flexural yielding of link element. The ductile yielding indicates wide hysteresis loop, which is excellent energy dissipation essential for high seismic event. The seismic performance of multi-story steel frame is designed according to the Indian code (IS800:2007). A simple computer-based pushover analysis is a procedure for performance-based design of buildings subjected to earthquake loading. Pushover analysis gets much importance in the past due to its ease and efficiency of the results. In this study eight frames were taken,among these, six frames which were braced as V, Inverted V, and Diagonal and remaining two are frames without bracing in two alternate heights (4 and 8 story). Seismic response of frames is studied using non-linear static analysis (pushover analysis) in terms of base shear, roof displacement, spectral displacement, spectral acceleration and story drift.

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