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   許雅玲¹，  曹加良²
   （1 建設(shè)綜合勘察研究設(shè)計(jì)院有限公司，北京 100007； 2 同濟(jì)大學(xué)，上海 200092）

[摘要] 建筑結(jié)構(gòu)抗震設(shè)計(jì)方法應(yīng)能體現(xiàn)地震動(dòng)主要特性的影響。作為結(jié)構(gòu)抗震設(shè)計(jì)主要方法之一的反應(yīng)譜法一直以來被認(rèn)為只能反映地震動(dòng)的頻譜和振幅影響，對(duì)于地震動(dòng)持時(shí)特性的影響則未能有明確反映。通過選用高通低截止頻率的強(qiáng)震記錄，建立長(zhǎng)周期反應(yīng)譜，研究了地震動(dòng)振幅和持時(shí)對(duì)長(zhǎng)周期結(jié)構(gòu)反應(yīng)譜形狀和譜值的影響，探討了利用反應(yīng)譜法體現(xiàn)地震動(dòng)持時(shí)對(duì)結(jié)構(gòu)地震響應(yīng)影響的可能性。研究結(jié)果表明，地震動(dòng)振幅僅影響長(zhǎng)周期結(jié)構(gòu)反應(yīng)譜的譜值，地震動(dòng)持時(shí)對(duì)速度譜影響較小，對(duì)加速度譜和相對(duì)位移譜的長(zhǎng)周期段譜值影響較大，在抗震設(shè)計(jì)中可通過將加速度譜或相對(duì)位移譜乘以持時(shí)調(diào)整系數(shù)來反映地震動(dòng)持時(shí)對(duì)長(zhǎng)周期結(jié)構(gòu)地震響應(yīng)的影響。
[關(guān)鍵詞] 持時(shí)；幅值；地震動(dòng)；反應(yīng)譜；長(zhǎng)周期結(jié)構(gòu)
中圖分類號(hào)：P315.9，TU311.3    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2012) Sl-0207-03

Influence of ground motion characteristics on response spectra of long-period structures
Xu Yaling¹, Cao Jialiang²
(1  China Institute of Geotecluucal Inverstigation and Surveying, Beijing 100007, China; 2 Tongji University, Shanghai 200092, China)

Abstract: Influence of characteristics of ground motion on structural seisnuc response should be embodied in structural seismic design method. As one of these methods, response spectrum method has been considered to only embody the influence of frequency spectrum and amplitude of to structural seismic response, but influence of duration. By selecting strong motion records with low usable frequency, influence of amplitude and duration on seismic response of long-period structure was studied as well as probability of using response spectrum method to embody influence of duration on structural seisnuc response. The results show that the acceleration amplitude only has influence on response spectral value, and the duration has little influence on velocity spectrum compared with the influence of duration on absolute acceleration spectrum and relative displacement spectrum, the influence of duration on seismic response of long-period structure can be considered by acceleration or displacement spectrum multiplied by adjustment coefficient of duration in structural seismic design.
Keywords: duration; amplitude; ground motion; response spectra; long-period structures