Abstract
Nonlinear response history analysis (NLRHA) procedure is one of the most precise and accurate numerical method to compute the seismic demands of high-rise structures but is complex, rigorous, and time-consuming and requires a lot of expertise for nonlinear modelling and results interpretation. Therefore, practicing engineers in developing countries like Pakistan still use the simplified analysis procedures to compute the seismic demands. Among the simplified analysis procedures, equivalent lateral force and response spectrum analysis procedures are widely used for the design purpose. However, other procedures have also been proposed in the recent past to accurately capture the higher mode effects in mid-to-high-rise structures. In the current study, results of a forty-story core wall building are used to check the relative accuracy and ease of application of different simplified analysis procedures. Furthermore, a modal decomposition technique is used to separate the modal responses from the NLRHA results, and a mode wise comparison of different demand parameters for different simplified procedures is performed. The current study has been used to clearly identify the reasons of inaccuracies in different simplified procedures. Furthermore, a simplified analysis procedure is proposed to accurately estimate the seismic demands of high-rise buildings and the possible solutions to improve their predictions.
Highlights
Recent survey by the United Nations estimated that more than half the population of the world lives in the urban regions [1]. e United Nations predicted that, by the end of 2050, about 64% of the developing countries and 86% of the developed countries population will be living in the cities
The current study focuses on the comparison of results from different simplified analysis procedures with the results from the time history analysis
uncoupled modal response history analysis (UMRHA) Results and Discussion. e UMRHA procedure is used to determine the seismic demands of the 40story building to each of the three ground motions, both for the design basis earthquake (DBE) and maximum considered earthquake (MCE) levels. e modal seismic response time histories are first determined and combined in the time domain for each of the floor level using Equation (10) to obtain the total seismic response time history of the building
Summary
Recent survey by the United Nations estimated that more than half the population of the world lives in the urban regions [1]. e United Nations predicted that, by the end of 2050, about 64% of the developing countries and 86% of the developed countries population will be living in the cities. Response spectrum analysis (RSA) procedure, on the other hand, explicitly takes into account the higher mode actions and is the most commonly adopted procedure to compute the seismic demands of buildings in many countries. Chopra and Goel [21] suggested the modal pushover analysis (MPA) procedure to overcome shortcomings of NSP procedure based on the fundamental mode only In this technique, firstly, all significant modes in which the building will vibrate are determined. Based on an in-depth analysis of modal responses using modal decomposition techniques, a modified simple analysis procedure is proposed For this purpose, a high-rise core wall building is chosen as a case study building as explained
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