渤海海域软表层厚度对反应谱的影响
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摘要
利用渤海海域场地土层模型,改变其软表层的厚度,构造出一系列新的场地模型,采用等效线性化方法进行场地地震反应计算,得到这些场地模型的反应谱,从而进行软表层厚度对反应谱影响的分析。结果表明:(1)随着软表层厚度的增加,反应谱谱形向低频方向移动;(2)当软表层厚度不大或输入地震动不大时,大多数频率处的反应谱值会增大;当输入地震动变大或软表层厚度继续增大时,反应谱会在高频处减小,在低频处增大;(3)随着软表层厚度的增加,特征周期逐渐增大,反应谱平台值先增大后减小,减小的速率有随厚度增加而变慢的趋势,本文所选场地的平台值最大值出现在软表层厚度为4~6 m附近。
Firstly we selected typical site soil models of Bohai Sea,and we constructed a series of new soil models by changing thickness of soft surface soil. Secondly we used equivalent linear method to compute site seismic response and obtained response spectra of these new models. Thirdly we analyzed the influence of soft surface soil's thickness on site response spectra. The results show that:( 1) With the increase of thickness of soft surface soil,the response spectrum moves toward low frequency.( 2) When thickness of soft surface soil or the input seismic acceleration is small,the response spectrum's values at most frequencies will increase. When thickness of soft surface soil or the input seismic acceleration becomes bigger,the response spectrum will decreases at high frequencies and increases at low frequencies.( 3) With the increase of the thickness of soft surface soil,characteristic period will increases gradually,the platform value of the response spectrum firstly increases then decreases,decreasing rate slows down with thickness' s increase. For sites in this paper,maximum platform values appear when soft surface soil's thickness is around 4 ~ 6 m.
引文
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