# [1]黄青隆,罗永峰,相阳,等.钢拱结构面内地震反应分析的改进模态组合系数法[J].东南大学学报(自然科学版),2018,48(3):470-477.[doi:10.3969/j.issn.1001-0505.2018.03.014] 　Huang Qinglong,Luo Yongfeng,Xiang Yang,et al.Modified factored modal combination method for seismic response analysis of planar steel arches[J].Journal of Southeast University (Natural Science Edition),2018,48(3):470-477.[doi:10.3969/j.issn.1001-0505.2018.03.014] 点击复制 钢拱结构面内地震反应分析的改进模态组合系数法() 分享到： var jiathis_config = { data_track_clickback: true };

48

2018年第3期

470-477

2018-05-20

## 文章信息/Info

Title:
Modified factored modal combination method for seismic response analysis of planar steel arches

Author(s):
College of Civil Engineering, Tongji University, Shanghai 200092, China

Keywords:

TU973.31
DOI:
10.3969/j.issn.1001-0505.2018.03.014

Abstract:
In order to consider the effect of geometrical nonlinearity and multi-mode contributions in the pushover analysis of the seismic response of planar steel arches, a modified factored modal combination method is proposed. First, a nonlinear stiffness ratio αk is introduced to quantify the effect of geometrical nonlinearity on the initial structural frequency. Then, a limit value β is defined for selecting dominated modes, and the combined load profiles are established based on the dominated modes. Finally, the structural responses are obtained by pushover analysis based on the combined load profiles. The results of two planar steel arches with the span-rise ratio of 1/4 and 1/5 show that the modified method is convenient and effective. Compared with the results of response history analysis, when the peak ground acceleration is 0.3g, the average errors of the steel arches in the x direction peak displacement with the span-rise ratios of 1/4 and 1/5 are 2.7% and -7.2%, respectively, and -6.5% and 5.8% in the y direction. The average errors in the peak member stress are -5.0% and -4.3%, respectively. With the increase of the peak ground acceleration, the average errors of the peak displacement and the peak member stress keep stable in the x and y directions.

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