中日规范地下结构反应位移法的位移与剪力研究

在我国《城市轨道交通结构抗震设计规范》对地下结构反应位移法的设计指导偏少的情况下,研究分析其与日本《水道施設耐震工法指针·解说》反应位移法地层位移函数和地层剪力计算公式的差异,并通过某工程地铁车站的算例比较得到,车站埋置于中软土层的地层位移和地层剪力计算,"日本规范"偏于安全,而中硬土层的计算则"中国规范"偏于安全。建议地下结构抗震设计中,当车站埋置土层剪切波速大于300 m/s时,不宜再留设过多安全储备,并可结合安评参数考虑一定的地震作用折减。

Study on Displacement and Shear Force of Underground Structure Response Displacement Method in Specifications of China and Japan

Due to the fact that there is less domestic guidance for the design of underground structure response displacement method in the urban rail transit construction code for seismic design,this paper focuses on the differences in the formulas to calculate the displacement and shear force of the stratum defined in the specifications of China and Japan. The comparison of the calculations based on a metro station shows that Japanese specification addresses more on safety for the calculation of station embedded in soft soil layer,while the Chinese specification focuses more on safety for the calculation of station embedded in hard soil layer. It is recommended that for seismic design,where the soil shear wave velocity is greater than 300 m / s,safety reserves should not be excessively maintained and some reduction of seismic motion may be considered in combination with safety assessment parameters.