独柱高架车站考虑桩土相互作用的抗震性能分析

发布时间：2018-06-07 04:49

本文选题：独柱高架车站 + 桩基础　；参考：《建筑结构学报》2014年05期

【摘要】：采用双向线性弹簧模拟桩土相互作用,并考虑了结构P-Δ效应、材料塑性等非线性因素,用ABAQUS有限元分析软件,研究了独柱高架车站在设防烈度三向罕遇地震作用下的抗震性能。将其分析结果与假定基础为刚性的结构计算结果进行了对比分析。研究结果表明,考虑桩土相互作用对结构强轴和弱轴方向的响应有不同的影响,结构强轴方向的最大位移增加了100%,墩柱底剪力增加了20%,而结构弱轴方向的响应则与假定基础刚性时的计算结果基本相同。假定基础刚性时,尚处于弹性状态的端部楼梯间梁和站厅层轨道梁等关键受力构件,在考虑桩土作用时均进入塑性状态。根据分析结果,采取了加宽变形缝、增大墩柱配筋、加强关键受力构件等改进措施,以提高结构的抗震性能。分析还表明在现有条件下,双向线性弹簧仍是简便易行的分析桩土相互作用的有效方法,其计算结果可为结构设计提供针对性建议。
[Abstract]:The interaction between pile and soil is simulated by a bidirectional linear spring, and nonlinear factors such as P- 螖 effect and material plasticity are taken into account. The seismic behavior of a single column elevated station under the action of earthquake fortification in three directions is studied by using ABAQUS finite element analysis software. The results of analysis are compared with those of the structure with rigid foundation. The results show that considering the pile-soil interaction, there are different effects on the responses of the strong axis and the weak axis of the structure. The maximum displacement in the direction of the strong axis of the structure is increased by 100 parts, the shear force at the bottom of the pier increases by 20%, and the response in the direction of the weak axis of the structure is basically the same as that calculated when the foundation is assumed to be rigid. Assuming that the foundation is rigid, the key load-bearing members, such as the end-stair beam and the track-beam of the station hall, which are still in the elastic state, all enter the plastic state when considering the action of the pile and soil. According to the results of the analysis, some measures are taken to improve the seismic performance of the structure, such as widening the deformation joint, increasing the reinforcement of the pier column and strengthening the key bearing members. The analysis also shows that the bidirectional linear spring is still a simple and effective method for analyzing pile-soil interaction under the existing conditions, and its calculation results can provide some suggestions for structural design.
【作者单位】：中国建筑科学研究院;北京城建设计研究总院有限责任公司;
【基金】：国家“十二五”科技支撑计划(2012BAJ07B01)
【分类号】：TU473.1;TU435

【参考文献】