现已提出了一种以土层变形为等效地震荷载形式的地下结构简化抗震计算方法——整体强制反应位移法，介绍了该方法的基本思想与具体实施步骤。土层变形作为等效地震荷载，是影响整体强制反应位移法的计算精度的关键，其准确性和适用性受到土层条件及结构本身等多方面因素的影响。通过改变地铁车站结构型式、地下结构在土层中的埋深与地基土体刚度对整体强制反应位移法进行了适用性分析，将应用该方法在不同情况下的计算结果与动力时程法进行了对比。结果表明整体强制反应位移法在软土地下结构抗震计算与分析中具有良好的适应性与计算精度。为进一步考虑地下结构抗震计算时的土层-结构相对刚度问题提出采用结构剪切变形修正系数R对方法进行修正，验算表明修正后的整体强制反应位移法计算误差更小，适用性更广。
Abstract
An underground structures’ simplified aseismic analysis method named the integral forced response dis-placement method was proposed to directly take soil deformation as equivalent earthquake loading.The fundamental idea and the specific implementation steps were introduced.Since the equivalent earthquake loading was obtained through free-field seismic response analysis, its accuracy was influenced by soil condition and the structure itself, so the accuracy of the integral forced response displacement method was also affected.The applicability of this method was analyzed through changing underground structure type, its burial depth and base soil stiffness.The results obtained with this method in vari-ous cases were compared with those using the dynamic time history analysis.It was shown that the integral forced response displacement method has a good applicability and a satisfactory accuracy in most cases, and the method is suitable for aseismic analysis and design of underground structures in soft soil.Considering the soil-structure relative stiffness in aseis-mic analysis of underground structures, the structure shear deformation correction coefficient R was proposed to modify this method.The checking calculations showed that the modified integral forced response displacement method has smaller er-rors and a wider applicability.
关键词
地下结构 /
整体强制反应位移法 /
抗震计算 /
适用性 /
土结刚度比
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Key words
underground structures /
integral forced displacement method /
seismic analysis /
applicability /
flexibility ratio
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