科研之友
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摘要
In this paper, a new lateral load pattern is proposed for pushover analysis of structures. In order to evaluate the accuracy and performance of the proposed lateral load pattern in estimation of seismic behavior of structures, the capacity curves obtained from the pushover analysis with the proposed lateral load pattern are compared to the capacity curve obtained from the incremental dynamic analysis (IDA) as an exact solution. Moreover, for comparison purposes, the uniform and triangular lateral load patterns proposed by Federal Emergency Management Agency (FEMA) are applied for the pushover analysis. Numerical studies are carried out on three frames with 4, 12 and 20-story and two lateral resisting systems, steel moment-resisting frames (MRF) and concrete special moment-resisting frames (SMRF). The results indicate that in the low-period steel MRF, the triangular load pattern and with the increase of the period, the uniform lateral load patterns are suitable for lateral load distribution. Furthermore, the results show that the proposed load pattern can provide an appropriate accuracy to estimate seismic behavior of the structures. In low-period concrete SMRF, the uniform load pattern proposed by FEMA is a suitable pattern for pushover analysis, but with increase of the period, the lateral load patterns recommended by FEMA cannot provide accurate results. However, the proposed lateral load pattern indicates more accuracy results. Therefore, it is suggested to evaluate the nonlinear behavior of the structures.
- 出版日期2015-5
