Effectiveness of physics-based collapse criteria in seismic risk assessment of code-conforming low-rise RC framed structures

Pathak, Shivang; Khennane, Amar; Watt, Simon; Al‐Deen, Safat

doi:10.1016/j.istruc.2020.05.033

Cited by 2 publications

(1 citation statement)

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“…E K > E EQ . The use of velocity-dependent energies was followed in other studies (Pathak et al ., 2020). However, it should be noted that these criteria show structural collapse with a delay in some cases because of their dependence on velocity and gravity load (or weight).…”

Section: Introductionmentioning

confidence: 99%

An efficient energy-based methodology for seismic collapse assessment of steel moment frame buildings

Esmailzadeh-Shahri,

Eshghi

2023

IJSI

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PurposeNonlinear dynamic analyses are employed for seismic collapse risk evaluation of existing steel moment frame buildings. The standards, such as ASCE 41-17, often define collapse thresholds based on plastic deformations; however, the collapse process involves several factors, and plastic deformation is only one of them. An energy-based approach employs deformation and resistance responses simultaneously, so it can consider various factors such as excessive deformation, stiffness and resistance degradation, and low-cycle fatigue as cumulative damage for seismic assessment. In this paper, an efficient energy-based methodology is proposed to estimate the collapse threshold responses of steel moment frame buildings.Design/methodology/approachThis methodology uses a new criterion based on the energy balance concept and computes the structural responses for different seismic hazard levels. Meanwhile, a pre-processing phase is introduced to find the records that lead to the collapse of buildings. Furthermore, the proposed methodology can detect failure-prone hinges with a straightforward probability-based definition.FindingsThe findings show that the proposed methodology can estimate reasonably accurate responses against the results of the past experiment on the collapse threshold. Based on past studies, ASCE 41-17 results differ from experimental results and are even overly conservative in some cases. The authors believe that the proposed methodology can improve it. In addition, the failure-prone hinges detected by the proposed methodology are similar to the predicted collapse mechanism of three mid-rise steel moment frame buildings.Originality/valueIn the proposed methodology, new definitions based on energy and probability are employed to find out the structural collapse threshold and failure-prone hinges. Also, comparing the proposed methodology results against the experimental outcomes shows that this methodology efficiently predicts the collapse threshold responses.

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Section: Introductionmentioning

confidence: 99%