砂土地区桥梁桩-土动力相互作用模型

Interaction Model of Pile-Soil Dynamics of Bridge in Sandy Soil Area

为了进一步研究砂土地区桥梁桩-土动力的相互作用,采用模拟方法进行了桥梁结构地震下的响应对比分析。基于工程实例,采用单墩模型在OpenSEES中建立桩-土相互作用分析模型,然后采用3种方法进行地震下桩-土作用的模拟。结果表明:当地质主要由砂土构成时,3种模型的计算结果比较接近。建议采用动力p-y法进行分析,因为在地震烈度较高时,动力p-y模型中的间隙单元被激活,可考虑桩-土界面发生脱离的情况。

In order to further study the interaction between pile and soil dynamics of bridges in sandy soil area, a comparative analysis of the response of the bridge structure under earthquakes was carried out using a simulation method. Based on engineering examples, a single-pier model was used to establish a pile-soil interaction analysis model in OpenSEES, and three methods were applied to simulate the pile-soil interaction under earthquakes. The results show that when the geological conditions are mainly composed of sand, the calculation results of the three models are relatively close. The dynamic p-y method is recommended because the gap element in the dynamic p-y model is activated when the seismic intensity is high, and the detachment of the pile-soil interface can be considered.