地下结构抗震分析的整体式反应位移法

INTEGRAL RESPONSE DEFORMATION METHOD FOR SEISMIC ANALYSIS OF UNDERGROUND STRUCTURE

对目前地下结构抗震分析中的传统反应位移法进行分析,针对该方法的主要误差来源,结合反应位移法明确的物理概念及严密的理论基础,提出一种适用于地下结构抗震分析的计算方法——整体式反应位移法。整体式反应位移法在反应位移法的基础上,通过直接建立土–结构分析模型来反映土–结构间相互作用,避免引入地基弹簧带来的计算量和计算误差。为验证改进方法的有效性,一方面从物理概念出发,论证改进方法与反应位移法的一致性;另一方面通过数值计算,将整体式反应位移法与动力时程分析方法进行对比分析。结果表明,整体式反应位移法相比于反应位移法计算量小,计算结果更接近动力时程方法,是一种实用性强的拟静力方法。

The response deformation method for seismic analysis of underground structures is introduced. Based on the physical concept and basic principle of the response deformation method, an integral response deformation method is proposed to reduce the error source of the original method. The integral response deformation method takes the soil-structure model to realize the interaction between soil and structure. In order to verify the efficiency of the improved method, on the one hand, the improved method is proved to be consistent with the response deformation method in the physical concept; on the other hand, the improved method is compared with the dynamic analysis method by numerical calculation. It can be found from the numerical results that, compared to the response deformation method, the integral response deformation method requires less computational complexity and achieves more accurate result. The integral response deformation method is proved to be a highly practical pseudo-static method.