Pushover Analysis of Existing Asymmetrical Building Using Modal Load Pattern, Soil Flexibility and Infill Walls—A Case Study

2021 ◽  
pp. 171-190
Author(s):  
Karismita Pathak ◽  
Atanu Kumar Dutta
Keyword(s):  
Pushover Analysis ◽  
Infill Walls ◽  
Soil Flexibility ◽  
Load Pattern

scholarly journals Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

Buildings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 276
Author(s):  
Nisar Ali Khan ◽  
Giorgio Monti ◽  
Camillo Nuti ◽  
Marco Vailati
Keyword(s):  
Numerical Model ◽  
Construction Materials ◽  
Building Codes ◽  
Construction Technique ◽  
Infill Walls ◽  
Mortar Strength ◽  
Materials Used ◽  
Seismic Response Of Buildings

Infilled reinforced concrete (IRC) frames are a very common construction typology, not only in developing countries such as Pakistan but also in southern Europe and Western countries, due to their ease of construction and less technical skills required for the construction. Their performance during past earthquakes has been in some cases satisfactory and in other cases inadequate. Significant effort has been made among researchers to improve such performance, but few have highlighted the influence of construction materials used in the infill walls. In some building codes, infills are still considered as non-structural elements, both in the design of new buildings and, sometimes, in the assessment of existing buildings. This is mainly due to some difficulties in modeling their mechanical behavior and also the large variety of typologies, which are difficult to categorize. Some building codes, for example, Eurocode, already address the influence of infill walls in design, but there is still a lack of homogeneity among different codes. For example, the Pakistan building code (PBC) does not address infills, despite being a common construction technique in the country. Past earthquake survey records show that construction materials and infill types significantly affect the seismic response of buildings, thus highlighting the importance of investigating such parameters. This is the object of this work, where a numerical model for infill walls is introduced, which aims at predicting their failure mode, as a function of some essential parameters, such as the friction coefficient between mortar and brick surface and mortar strength, usually disregarded in previous models. A comprehensive case study is presented of a three-story IRC frame located in the city of Mirpur, Pakistan, hit by an earthquake of magnitude 5.9 on 24 September 2019. The results obtained from the numerical model show good agreement with the damage patterns observed in situ, thus highlighting the importance of correctly modeling the infill walls when seismically designing or assessing Pakistani buildings that make use of this technology.

scholarly journals EVALUASI STRUKTUR GEDUNG DUAL SYSTEM DENGAN DINDING GESER BERSAYAP C MENGGUNAKAN PUSHOVER ANALYSIS

2020 ◽  
Vol 3 (4) ◽  
pp. 1233
Author(s):  
Albert Albert ◽  
Daniel Christianto ◽  
Hadi Pranata
Keyword(s):  
Line Element ◽  
Pushover Analysis ◽  
Safety Performance ◽  
Life Safety ◽  
Target Displacement ◽  
Uniform Load ◽  
Load Pattern ◽  
Fema 356 ◽  
Strength And Stiffness ◽  
Equivalent Strength

ABSTRACTAlthough elastic analysis gives a good indication of the elastic capacity and behavior of a building, but the elastic method can’t predict when the first yield will occur, and the failure mechanism and account for redistribution of member forces when the plastic hinges progressively formed. The use of inelastic procedure for evaluation is an attempt made by engineer in the past days to better understand how the structure will behave when subjected to strong earthquake, assuming the elastic capacity of the structure will be exceeded. In this research the pushover analysis was done using the modelling criteria of FEMA 356. The modeling of C-flanged shear was done using line element with the equivalent strength and stiffness properties. Target displacement was calculated using the displacement coefficient method of FEMA 356. Based on the analysis the triangular load pattern resulted in larger target displacement than the uniform load. But the uniform load pattern gives larger seismic response than the triangular load pattern. The uniform load pattern resulted in Life Safety performance level, while the triangular load pattern resulted in Immediate Occupancy, based on the two load patterns used the structure resulted in Life Safety performance level.ABSTRAKWalaupun analisis elastik memberikan indikasi yang baik mengenai kapasitas dan perilaku elastik dari suatu gedung, tetapi metode elastik tidak dapat memperkirakan kapan pelelehan pertama terjadi, serta mekanisme kegagalan apa yang mungkin terjadi pada bangunan tersebut, dan memperkirakan redistribusi dari gaya- gaya dalam ketika pembentukan sendi plastis secara progresif terjadi. Fungsi dari analisis inelastik, sebagai prosedur untuk mengevaluasi bangunan, yang merupakan usaha dari insinyur-insinyur terdahulu memahami bagaimana struktur akan berperilaku apabila dikenai gempa kuat, dimana diasumsikan bahwa kapasitas elastik gedung telah terlampaui. Dalam penelitian ini dilakukan pushover analysis menggunakan kriteria pemodelan berdasarkan FEMA 356. Pemodelan dari dinding geser bersayap C dilakukan menggunakan line element dengan kekuatan dan kekakuan yang ekivalen. Target perpindahan dianalisis menggunakan metode coefficient of displacement dari FEMA 356. Berdasarkan analisis yang dilakukan didapat bahwa pembebanan segitiga lebih besar dibandingkan pembebanan merata. Namun, respons seismik yang didapat akibat beban merata, lebih besar dibandingkan beban segitiga. Pembebanan merata menghasilkan tingkatan kinerja Life Safety, sedangkan pembebanan segitiga menghasilkan tingkatan kinerja Immadiate Occupancy, berdasarkan kedua pembebanan tersebut didapat kinerja dari struktur tersebut adalah Life Safety.

Use of Pushover Analysis for Predicting Seismic Response of Irregular Buildings: A Case Study

2009 ◽  
Vol 13 (8) ◽  
pp. 1089-1100 ◽  
Author(s):  
Angelo D'Ambrisi ◽  
Mario De Stefano ◽  
Marco Tanganelli
Keyword(s):  
Seismic Response ◽  
Pushover Analysis ◽  
Irregular Buildings

scholarly journals Influence of exterior infill walls on the performance of RC frames under tsunami loads: Case study of school buildings in Sri Lanka

2021 ◽  
Vol 234 ◽  
pp. 111920
Author(s):  
Marta Del Zoppo ◽  
Kushan Wijesundara ◽  
Tiziana Rossetto ◽  
Priyan Dias ◽  
Marco Baiguera ◽  
...  
Keyword(s):  
Sri Lanka ◽  
School Buildings ◽  
Infill Walls ◽  
Rc Frames

Optimization of modal load pattern for pushover analysis of building structures

2013 ◽  
Vol 47 (1) ◽  
pp. 119-129 ◽  
Author(s):  
Mohsen Ali Shayanfar ◽  
Mansoor Ashoory ◽  
Taha Bakhshpoori ◽  
Basir Farhadi
Keyword(s):  
Pushover Analysis ◽  
Building Structures ◽  
Load Pattern

Convex Model for a New Lateral Load Pattern of Pushover Analysis

2011 ◽  
Vol 243-249 ◽  
pp. 4013-4016
Author(s):  
Li Zhe Jia ◽  
Zhong Dong Duan
Keyword(s):  
Response Spectrum ◽  
Pushover Analysis ◽  
Fundamental Equation ◽  
Lateral Load ◽  
Seismic Load ◽  
Influence Coefficient ◽  
Convex Model ◽  
Load Pattern ◽  
Relationship Of ◽  
Strong Ground

The uncertainties of earthquake currently were not considered with the various lateral load patterns of pushover. The convex set theory, which requires much less information, is employed to model the uncertainties of the seismic influence coefficient maximum and the characteristic period of response spectrum. Then the convex analysis method is integrated into the fundamental equation of pushover, and the analytic relationship of lateral seismic load and top displacement of buildings is derived. The results of numerical example shows that the new lateral load pattern of pushover proposed in this research may effective simulate the uncertainties of strong ground motion.

Non-Classical Probability Seismic Reliability Based on Pushover Analysis

2014 ◽  
Vol 638-640 ◽  
pp. 1822-1827
Author(s):  
Hao Li
Keyword(s):  
Probabilistic Model ◽  
Pushover Analysis ◽  
Probability Method ◽  
Convex Model ◽  
Classical Probability ◽  
Seismic Reliability ◽  
Structural Resistance ◽  
Level Function ◽  
Distribution Parameters

In this paper, the probabilistic model is used to quantify the uncertainty of structural resistance, and the convex model is used to quantify the seismic uncertainty. The distribution parameters for the probabilistic model, together with the interval range for the convex model, are obtained through pushover analysis. Two-level function equation method is employed to calculate the seismic reliability of the structure. Case study shows that compared with the classical probability method, the proposed method is more simple and reasonable for seismic reliability analysis.

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