New Nonlinear Modal Decomposition Method for Seismic Analysis of Tall RC Core Wall Buildings
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RESEARCH PAPER
New Nonlinear Modal Decomposition Method for Seismic Analysis of Tall RC Core Wall Buildings Tahir Mehmood1 · Muhammad Irshad Qureshi2 · Fawad Ahmed Najam3 · Ahsen Maqsoom1 · Adnan Nawaz1 · Hammad Salahuddin1 · Rana Faisal Tufail1 Received: 11 September 2018 / Accepted: 16 March 2020 © Shiraz University 2020
Abstract Significant research has been conducted in the past to develop simplified seismic evaluation procedures for tall buildings. However, most of these procedures are based on the use of fundamental mode response while ignoring the responses from higher modes. Moreover, such seismic evaluation procedures are unable to accurately predict individual-member responses. Evaluation of individual-member responses is an important part of damage and loss prediction estimation due to seismic hazard. In this research work, a new nonlinear modal decomposition approach is proposed for seismic evaluation of tall RC core wall buildings that can take into account the higher mode effects. This procedure is an extension of the classical Uncoupled Modal Response History Analysis procedure. A 44-story reinforced concrete core wall building is selected to verify the accuracy of the proposed procedure. A comparison between the outcomes of the proposed procedure and the nonlinear response history analysis procedure shows that this procedure is reasonably accurate in predicting important global and member responses. Keywords Tall buildings · Seismic analysis · Nonlinear modal decomposition · Higher modes
* Tahir Mehmood [email protected] Muhammad Irshad Qureshi [email protected] Fawad Ahmed Najam [email protected] Ahsen Maqsoom [email protected] Adnan Nawaz [email protected] Hammad Salahuddin [email protected] Rana Faisal Tufail [email protected] 1
Department of Civil Engineering, COMSATS University Islamabad, Wah Campus, Wah Cantonment, Pakistan
2
Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan
3
NUST Institute of Civil Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Islamabad, Pakistan
Abbreviations UMRHA Uncoupled Modal Response History Analysis RC Reinforced concrete NLRHA Nonlinear response history analysis NSP Nonlinear static procedure MPA Modal pushover analysis SRSS Squares-root-of-sum-of-squares SDOF Single-degree-of-freedom MDOF Multi-degree-of-freedom MVLEM Multiple vertical line element model
1 Introduction The number of tall buildings is increasing worldwide due to the lack of available space in cities for further construction and need for accommodating the growing human population. Such building structures not only are a symbol of the economic might of countries but also represent recent advancements in structural engineering. In the last few decades, understanding of the seismic hazard and seismic behavior of high-rise buildings, during extreme ground shakings, has greatly improved, resulting
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