地下建筑结构三维抗震简化计算方法研究

本文在理论分析的基础上,提出了地下建筑结构的三维抗震简化计算方法,研究了将地下结构平面模型的地震荷载和弹簧约束扩展应用于地下结构空间模型的具体实施方法,并建议了三维简化计算方法中法向和切向地基弹簧系数的数值计算方法。与三维有限元时程分析结果进行对比,验证了该方法的可靠性和适用性。三维抗震简化计算方法的提出,可以解决当空间地下建筑结构不能满足平面应变的假定条件时必须采用三维有限元时程分析进行抗震设计的问题。

Study on Three-dimensional Seismic Analysis Method for Underground Structures

Based on theoretical analysis,a three-dimensional simplified seismic calculation method is proposed for seismic design of underground structures.Furthermore,the method to expand the seismic load and spring constraints of plane model to three-dimensional model is studied,and finite element analysis method is proposed for the normal and tangential spring constants of the groundwork.Through comparison with three-dimensional finite element time-history analysis,the rationality and the accuracy of the simplified method are verified.The simplified method is suitable to the cases beyond the plane strain assumption.