- 摘 要
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謝異同, 王鑫娟, 任 鍵, 葛興云, 王 強(qiáng), 穆德君
(西安建筑科技大學(xué)土木學(xué)院,西安 710055)[摘要] 采用小波分解的方法對(duì)汶川地震近震區(qū)豎向地震動(dòng)加速度進(jìn)行分解,并對(duì)大跨度結(jié)構(gòu)作多點(diǎn)豎向地震動(dòng)輸入,采用時(shí)程分析法計(jì)算不同頻段豎向地震動(dòng)對(duì)大跨度結(jié)構(gòu)的內(nèi)力反應(yīng)。結(jié)果反映,豎向地震動(dòng)含有較多的高頻成分,其對(duì)結(jié)構(gòu)高階振型的影響較大。因此,在抗震設(shè)計(jì)中豎向地震動(dòng)和結(jié)構(gòu)的高階振型不容忽視。
[關(guān)鍵詞] 豎向地震動(dòng);多支點(diǎn);小波分解;地震反應(yīng)分析
中圖分類號(hào):TU311.3 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1002-848X(2011) Sl-0224-04Wavelet method for multi-support analysis of long-span structures under vertical seismic excitation
Xie Yitong, Wang Xinjuan, Ren Jian, Ge Xingyun, Wang Qiang, Mu Dejun
( Xian University of Technology and Architecture, Civil Engineering, Xian 710055, China)Abstract: The wavelet decomposition method was used to decompose the vertical seismic motion of the earthquake near Wenchuan, and multi-point vertical ground motion was input for long-span structures. Then the method of time-history analysis was used to calculate the intemal force response of vertical seismic of different frequency bands for long-span structures. The results show that the vertical ground motion contains more high frequency components, which affects lugher mode greatly. Therefore, the earthquake-resistant design can't neglect vertical ground motion and lugher mode.
Keywords: vertical ground motions; multi-pivot; wavelet decomposition; seismic response analysis
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