An adaptive modal pushover procedure for asymmetric-plan buildings

Shakeri, Kazem; Tarbali, Karim; Mohebbi, Mohtasham

doi:10.1016/j.engstruct.2011.11.032

Cited by 44 publications

(17 citation statements)

References 19 publications

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“…Nevertheless, the conventional pushover analysis is valid if the response of the structure is governed by a single mode (Fajfar, ; Chopra and Goel, ). For those structures not meeting the mentioned limitations, advanced pushover‐based methods can be employed, such as adaptive pushover analysis (Shakeri et al, ) and modal pushover analysis (Chopra and Goel, ), in order to consider the effects of higher modes in the analysis. In this study, a vertical distribution of loads proportional to the shape of the fundamental mode in the direction under consideration is used.…”

Section: Modelling Of Pefmentioning

confidence: 99%

Structural response of vertically irregular tall moment-resisting steel frames under pre- and post-earthquake fire

Behnam

2015

Struct. Design Tall Spec. Build.

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SUMMARYPost-earthquake fires (PEF) may result in a catastrophe in urban regions even worse than the earthquake itself. Most urban structures are not designed to resist two subsequent extreme loads such as earthquake and fire. Thus, these types of structures are too weak when subjected to the PEF loads. On the other hand, it is well understood that irregular building structures are more susceptible to sustain earthquake damage than regular buildings. Investigating irregular buildings can therefore be more important when there is a high possibility of PEF. While there are various irregularities, here, vertical irregularity is considered. The study is performed on one irregular seven-story tall moment-resisting steel frame designed based on the American Society of Civil Engineers code. The frame is firstly subjected to an earthquake load with the peak ground acceleration of 0.35 g and then is exposed to a generalized exponential fire curve. To make a comparison between the results, the PEF analysis is also performed for the regular frame. The results show that there is a marked difference between the PEF of the regular frame with that of the irregular frame. In addition, two types of failure-local and global-were observed during the analysis, where the local collapse is related to the deflection of beams, and the global collapse is pertained to the considerable movement of the columns. It is observed during the analysis that the irregular frames are more susceptible to collapse globally.

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Section: Modelling Of Pefmentioning

confidence: 99%

Structural response of vertically irregular tall moment-resisting steel frames under pre- and post-earthquake fire

Behnam

2015

Struct. Design Tall Spec. Build.

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“…The pioneer adaptive pushover application, which considers only single-mode behaviour, was proposed by Bracci et al (1997). Following this study, multi-mode adaptive pushover procedures were proposed by many researchers, e.g., Elnashai (2001), Aydınoglu (2003Aydınoglu ( , 2004Aydınoglu ( , 2007, Pinho (2004a, 2004b), Kalkan and Kunnath (2006), Shakeri et al (2010Shakeri et al ( , 2012, and Abbasnia et al (2013). The multi-mode adaptive methods may be classified into two groups.…”

Section: Introductionmentioning

confidence: 98%

“…The applied load vector at each step is calculated by subtracting the instantaneous combined modal shear forces of the consecutive stories. The implementation of the SSAP method to asymmetric-plan buildings was proposed by Shakeri et al (2012). In this method, a lateral force in two translational directions and torques at each step are calculated by subtracting the combined modal storey shears and the combined modal storey torques of consecutive stories.…”

Section: Introductionmentioning

confidence: 99%

A variant of modal pushover analyses (VMPA) based on a non-incremental procedure

Sürmeli

Yüksel

2015

Bull Earthquake Eng

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A variant of modal pushover analysis (VMPA) is presented to evaluate the seismic performance of the structures. The suggested procedure is based on an iterative process in which secant stiffnesses are used both at the element level and in the modal response. VMPA diverges from the existing modal pushover analyses for the following reasons: (1) mode compatible adaptive forces are applied to the structure at each iteration step, (2) the application of the equal displacement rule in combination with secant stiffness based linearization in the spectral displacement (S d )-spectral acceleration (S a ) relation eliminates the necessity to produce a modal capacity diagram for each mode. The displacement controlled algorithm determines the single ordinate of the modal capacity diagram corresponding to the target displacement demand for the nth mode (S dn_p , S an_p ) by reducing elastic spectral acceleration (S an_e ) to converge to the plastic acceleration (S an_p ). A Matlab based computer program known as DOC3D-v2 is developed to implement the proposed procedure. To verify the success of the suggested procedure, 9-and 20-storey LA SAC buildings are analysed, and the resulting demands are compared with several existing procedures, such as the extended N2, MPA and MMPA, as well as nonlinear time history analyses performed for two different set of acceleration records. VMPA yields enhanced results in terms of storey drifts, especially for the 20-storey LA building, compared with the other methods. Although the storey displacements and drifts are largely consistent with nonlinear time history analysis results, conservative estimates are obtained for the storey shear forces.Keywords Nonlinear static procedure Á Pushover analysis Á Adaptive pushover analysis Á Multi-mode analysis Á Higher mode effect

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“…Over the past decade, several efforts have been made to extend pushover analysis methods to unsymmetric-plan 3D building structures taking torsional effects into account. Modal pushover analysis (MPA) [8,23,24], consecutive modal pushover (CMP) procedure [21,22], the extended N2 [17], adaptive modal pushover procedure [27] and generalized force vectors method [15] were extended to unsymmetric-plan building structures in which the effect of higher modes in both elevation and plan (torsion) was taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

The modified and extended upper-bound (UB) pushover method for the multi-mode pushover analysis of unsymmetric-plan tall buildings

Poursha

Samarin

2015

Soil Dynamics and Earthquake Engineering

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An adaptive modal pushover procedure for asymmetric-plan buildings

Cited by 44 publications

References 19 publications

Structural response of vertically irregular tall moment-resisting steel frames under pre- and post-earthquake fire

Structural response of vertically irregular tall moment-resisting steel frames under pre- and post-earthquake fire

A variant of modal pushover analyses (VMPA) based on a non-incremental procedure

The modified and extended upper-bound (UB) pushover method for the multi-mode pushover analysis of unsymmetric-plan tall buildings

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