地下RC结构物地震响应特征土工离心试验的模拟  

Numerical simulation of centrifuge modeling for seismic responses of underground RC structures

作　　者：汪明武[1] Susumu Iai 

机构地区：[1]合肥工业大学土木建筑工程学院,安徽合肥230009 [2]京都大学防灾研究所

出　　处：《地震工程与工程振动》2007年第3期150-155,共6页Earthquake Engineering and Engineering Dynamics

基　　金：安徽省自然科学基金项目(01045409)

摘　　要：地下结构物抗震稳定性的研究具有重要实际意义。基于动态土工离心试验,应用有效应力法分析了不同水平地震作用下土层和地下RC结构物的最大水平位移、不同埋深的土层加速度和超孔隙水压力变化规律,以及结构物的破坏发展特征,并进一步与试验结果进行了相互验证和对比,取得了较好效果,为重要地下结构物的抗震设计提供了依据和参考。In order to insure the safety of underground structures in the earthquake-prone area, availability of seismic design of underground structure is of prime importance. Based on the dynamic centrifuge tests, the seismic responses of underground RC structure in liquefiable soils using the effective stress analysis method are investigated. It is concluded that the stronger the motion, the larger the maximum displacement, and the displacement of the top slab of RC structure is smaller than that in the ground at the same depth. Displacement of the surface soil is larger than that of deeper soil layer. Plastic yielding region of RC structures first occurred on the comers and spread. It is consistent with the cracks observed in RC structures during centrifuge tests. Moreover, a comparison, for the case with a input peak motion of 8.35 m/s^2 in prototype scale, between computed and measured time histories of displacements at the top slab and in the ground, earth pressures acting on the top slab of RC structure, and excess pore water pressure of sand deposit was conducted. The measured time history of excess pore water pressure is in excellent agreement with the corresponding computed value. Phase traces of displacement time histories between centrifuge test and numerical simulation, do mum values are not in fairly good agreement, match with each other. However, the measured and computed maximum values are not in fairly good agreement, which may be induced by the simply supposed lateral boundary, and the value measured at the frame of laminar box, which is unlikely to represent the displacement of soil itself. It is also found that the computed and measured total normal stress, to be called earth pressure, acting on the top slab of RC structure gradually decreased and reached, on average, the value of total vertical stress in the free field. As a whole, there is a good agreement of the results between the centrifuge test and numerical modeling. This study provides a foundation for the seismic design of underground structure

关 键 词：液化 地下结构 动态土工离心模型试验 有效应力分析 

分 类 号：P315.983[天文地球—地震学]