The extended consecutive modal pushover procedure for estimating the seismic demands of two-way unsymmetric-plan tall buildings under influence of two horizontal components of ground motions |
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| Institution: | 1. Faculty of Civil Engineering, Sahand University of Technology, Tabriz, Iran;2. Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran;3. Structural Engineering Research Center, International Earthquake and Seismology Research Centre, Tehran, Iran;1. Department of Mathematics, Nanjing University, Nanjing, 210093, PR China;2. School of Mathematics and Statistics, Xi’an Jiaotong University, Xi’an, 710049, PR China;3. Department of Mathematics and Statistics, Lanzhou University, Lanzhou, 730000, PR China;1. Department of Structural, Geotechnical and Building Engineering (DISEG), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Department of Civil and Environmental Engineering, University of Strathclyde, 75 Montrose Street, Glasgow G1 1XJ, Scotland, UK;1. Department of Civil, Chemical, Environmental, and Materials Engineering (DICAM), University of Bologna, Viale del Risorgimento 2, Bologna 40136, Italy;2. Department of Architecture, Built Environment and Construction Engineering, Technical University of Milan, Piazza Leonardo Da Vinci, Milan 20133, Italy;1. Aristotle University of Thessaloniki, Department of Civil Engineering, Division of Structural Engineering, University Campus, 541 24 Thessaloniki, Greece;2. Department of Civil Engineering, City University London, EC1V OHB London, UK |
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| Abstract: | This paper aims to extend the consecutive modal pushover (CMP) procedure for estimating the seismic demands of two-way unsymmetric-plan tall buildings subjected to bi-directional seismic ground motions taking the effects of higher modes and torsion into account. Multi-stage and single-stage pushover analyses are carried out in both X and Y directions. Inelastic seismic responses obtained by multi-stage and single-stage pushover analyses for X and Y directions are combined using the SRSS combination scheme. The final seismic responses are determined by enveloping the combined results of multi-stage and single-stage pushover analyses. To evaluate the accuracy of the proposed procedure, it is applied to two-way unsymmetric-plan tall buildings which include torsionally stiff and torsionally flexible systems. The results derived from the CMP procedure are compared with those from nonlinear response history analysis (NL-RHA), as a benchmark solution. Moreover, the advantages of the proposed procedure are demonstrated by comparing the results derived from the CMP to those from pushover analysis with uniform and fundamental effective mode distributions. The proposed procedure is able to accurately predict amplification or de-amplification of the seismic displacements at the flexible and stiff edges of the two-way unsymmetric-plan tall buildings by considering the effects of higher modes and torsion. The extended CMP procedure can accurately estimate the peak inelastic responses, such as displacements and storey drifts. The CMP procedure features a higher potential in estimating plastic hinge rotations at both flexible and stiff sides of unsymmetric-plan tall buildings under bi-directional seismic excitation when compared to the uniform and fundamental effective mode force distributions. |
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| Keywords: | Consecutive modal pushover (CMP) procedure Two-way unsymmetric-plan tall buildings Two horizontal components of ground motions Torsion Higher-modes effect |
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