Multimode pushover analysis for asymmetric buildings under biaxial seismic excitation based on a new concept of the equivalent single degree of freedom system

Manoukas, Grigorios E.; Athanatopoulou, Asimina; Avramidis, Ioannis

doi:10.1016/j.soildyn.2012.01.018

Cited by 35 publications

(29 citation statements)

References 7 publications

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“…In recent decades, the author and other researchers worked to extend these simplified procedures to improve the seismic‐performance estimates of buildings with plan or elevation irregularities or both . Recent investigations of the extension of this simplified procedure to an irregular structure were conducted by Lavan and De Stefano and Zembaty and De Stefano .…”

Section: Introductionmentioning

confidence: 99%

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Fujii

2018

Japan Architectural Review

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The applicability of a simplified procedure, namely mode‐adaptive bidirectional pushover analysis (MABPA), to the prediction of the non‐linear peak response of a multistory asymmetric building subjected to bidirectional excitation is discussed. The first part of the paper summarizes the formulation of 2 independent equivalent single‐degree‐of‐freedom models representing the first and second modal responses. The relationship between the critical assumptions of MABPA and the torsional index defined based on mode shape is then discussed. In the latter part of the paper, non‐linear time‐history analyses of 4‐story torsionally stiff (TS) or torsionally flexible asymmetric buildings are described, and the results are compared with the predictions. The results show that MABPA predicts the peak response displacement of only the TS asymmetric buildings satisfactorily. Therefore, MABPA should be considered applicable only to TS buildings. The applicability of MABPA to a given asymmetric building may be evaluated by using the torsional indices of the first 3 modes.

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Section: Introductionmentioning

confidence: 99%

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Fujii

2018

Japan Architectural Review

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“…The preliminary evaluation of the proposed methodology (Manoukas et al ., ), (Manoukas and Avramidis, ) for single‐storey and multistorey buildings, indicated that, in general, provides for each response parameter at the mass center and at the flexible side of buildings an upper limit and a lower limit that in the vast majority of cases envelope the corresponding value obtained by NDA. Besides, the mean errors with regard to the NDA results are significantly smaller than those resulting from a multimode pushover procedure comprising independent analysis along two horizontal axes and directional combination of the results.…”

Section: Introductionmentioning

confidence: 94%

“…Recently, a new multimode pushover procedure for the approximate estimation of the seismic response of asymmetric in plan buildings under biaxial seismic excitation has been developed (Manoukas et al ., ). Its main idea is that the seismic response of an asymmetric multi‐degree‐of‐freedom (MDOF) system with N degrees of freedom under biaxial excitation can be related to the responses of N ‘modal’ E‐SDOF systems under uniaxial excitation.…”

Section: Introductionmentioning

confidence: 97%

Improved multimode pushover procedure for asymmetric in plan buildings under biaxial seismic excitation—application to tall buildings

Manoukas

Avramidis

2014

Structural Design Tall Build

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Summary An improved version of a recently developed multimode pushover procedure for asymmetric in plan buildings under biaxial seismic excitation is presented and evaluated. The proposed methodology is quite similar to the well‐known modal pushover analysis. However, the establishment of the equivalent single‐degree‐of‐freedom systems is based on a new concept, which takes into account multidirectional seismic effects. The proposed methodology does not require independent analysis in the two orthogonal directions, and therefore, the application of simplified directional combination rules is avoided. The improvement presented here consists in definition of correction factors to be applied to the response values at the stiff side of buildings. An extensive evaluation study comprising applications to tall buildings is presented. The response parameters obtained from the proposed methodology in most cases envelope the values resulting from nonlinear dynamic analysis (NDA). Furthermore, the mean errors with regard to the NDA results are smaller than those obtained from a multimode pushover procedure comprising independent analysis along two horizontal axes and directional combination of the results. In general, the proposed methodology provides a reasonable estimation of the seismic performance of asymmetric buildings.

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“…., u p,i,n ], which can be obtained by modal pushover analysis (Manoukas et al, 2012;Miao et al, 2011;Poursha et al, 2011).…”

Section: Estimation Of Hysteretic Energymentioning

confidence: 99%

A method for evaluating earthquake-induced structural damage based on displacement and hysteretic energy

Wang

Zhang

2016

Advances in Structural Engineering

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Rather than viewing earthquake-induced structural damage as a single index of maximal deformation, it can be viewed as a combination of two indices, that is, the deformation demand and dissipation of energy. A method for evaluating the earthquake-induced damage of multi-storey buildings is presented that considers the maximal storey drift and the storey hysteretic energy. In this method, the maximal storey drift is estimated by means of the strength reduction factor spectrum, pushover analysis and distribution formula of deformation along structural storeys, which is based on the modal decomposition hypothesis in the nonlinear response stage of structures. For estimating the storey hysteretic energy demand, the normalized hysteretic energy spectrum of constant ductility factors is established, where the normalized hysteretic energy is defined as the ratio of the hysteretic energy to the square of the peak ground acceleration, and the formula for the distribution of hysteretic energy along structural storeys is derived based on the relation of the simplified internal forces of structures. For demonstrating the process of the proposed method and verifying its accuracy, an example is implemented, and the analysis results of the example indicate the following: (1) the method proposed in this article is a simple and easily implemented method for evaluating the structural damage induced by earthquakes and (2) the distribution formulas of the maximal drift and hysteretic energy along structural storeys derived in this article are relatively accurate.Keywords damage index, displacement demand, hysteretic energy, nonlinear response history analysis, pushover analysis, storey drift

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Multimode pushover analysis for asymmetric buildings under biaxial seismic excitation based on a new concept of the equivalent single degree of freedom system

Cited by 35 publications

References 7 publications

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Improved multimode pushover procedure for asymmetric in plan buildings under biaxial seismic excitation—application to tall buildings

A method for evaluating earthquake-induced structural damage based on displacement and hysteretic energy

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