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。
Finite element analysis software ABAQUS was used to study the seismic performance of a single-column elevated station under three way rare earthquake. Bi-linear spring was used to simulate the pile-soil interaction. Structural P-Δ effect and materials plastic etc. nonlinear factors were considered. And a detailed comparison with rigid foundation assumption was done. The results show that structure effects of strong axis and weak axis are different by considering pile-soil interaction. The maximum displacement of structure strong axis is increased by 100% and the pier stud bottom shear force is increased by 20%. Structure effects of weak axis are basically the same as the rigid foundation case. The staircase beams,station hall beams and other critical elements are still in elastic state when the foundation is assumed to be rigid,but when the pile-soil interaction is considered the beams go into plastic state. According to analysis results,several measures are used to improve structure seismic performance such as widening deformation joint,adding pier stud reinforcement and enhancing key elements etc. Analysis results show that under the existing conditions,bi-linear spring is still a simple and effective method of considering pile-soil interaction which can provide specific suggestion for structure design.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第5期25-32,共8页
Journal of Building Structures
基金
国家"十二五"科技支撑计划(2012BAJ07B01)
关键词
独柱高架车站
桩基础
桩土相互作用
双向线性弹簧
动力弹塑性分析
抗震性能
single-column elevated station
pile foundations
pile-soil interaction
bi-linear spring
dynamic elastoplastic analysis
seismic performance
