Imperial College London
Alternate

ProfessorAhmedElghazouli

Faculty of Engineering, Department of Civil and Environmental Engineering

Emeritus Professor of Structural Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6021a.elghazouli

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

440Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Liapopoulou:2020:10.1002/eqe.3278,
author = {Liapopoulou, M and BravoHaro, MA and Elghazouli, AY},
doi = {10.1002/eqe.3278},
journal = {Earthquake Engineering & Structural Dynamics},
pages = {1051--1071},
title = {The role of ground motion duration and pulse effects in the collapse of ductile systems},
url = {http://dx.doi.org/10.1002/eqe.3278},
volume = {49},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The seismic collapse capacity of ductile singledegreeoffreedom systems vulnerable to PΔ effects is investigated by examining the respective influence of ground motion duration and acceleration pulses. The main objective is to provide simple relationships for predicting the durationdependent collapse capacity of modern ductile systems. A novel procedure is proposed for modifying spectrally equivalent records, such that they are also equivalent in terms of pulses. The effect of duration is firstly assessed, without accounting for pulses, by assembling 101 pairs of long and short records with equivalent spectral response. The systems considered exhibit a trilinear backbone curve with an elastic, hardening and negative stiffness segment. The parameters investigated include the period, negative stiffness slope, ductility and strain hardening, for both bilinear and pinching hysteretic models. Incremental dynamic analysis is employed to determine collapse capacities and derive design collapse capacity spectra. It is shown that up to 60% reduction in collapse capacity can occur due to duration effects for flexible bilinear systems subjected to low levels of PΔ. A comparative evaluation of intensity measures that account for spectral shape, duration or pulses, is also presented. The influence of pulses, quantified through incremental velocity, is then explicitly considered to modify the long records, such that their pulse distribution matches that of their short spectrally equivalent counterparts. The results show the need to account for pulse effects in order to achieve unbiased estimation of the role of duration in flexible ductile systems, as it can influence the durationinduced reduction in collapse capacity by more than 20%.
AU  - Liapopoulou,M
AU  - BravoHaro,MA
AU  - Elghazouli,AY
DO  - 10.1002/eqe.3278
EP  - 1071
PY  - 2020///
SN  - 0098-8847
SP  - 1051
TI  - The role of ground motion duration and pulse effects in the collapse of ductile systems
T2  - Earthquake Engineering & Structural Dynamics
UR  - http://dx.doi.org/10.1002/eqe.3278
UR  - https://onlinelibrary.wiley.com/doi/full/10.1002/eqe.3278
UR  - http://hdl.handle.net/10044/1/78549
VL  - 49
ER  -
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