考虑桩土动力相互作用的钢-钢筋混凝土组合连续梁桥的抗震性能分析

The Seismic Performance Analysis of the Continuous Steel-reinforced Concrete Box Girder Bridge with the Consideration of the Soil-structure Dynamic Interaction

考虑桩土动力相互作用,以某跨海大桥浅水区非通航孔桥为对象,采用反应谱法研究了钢-钢筋混凝土组合连续梁的自振特性以及不同水准的地震响应,并以其下部墩身和桩身的M-N关系曲线及桩基土的承载能力为控制目标研究了该桥的抗震性能.通过与不考虑桩土动力相互作用的模型比较表明,建立包含桩土动力相互作用模型能获取更为完整准确的桥梁自振特性及抗震性能.

A non navigational channel cross-sea bridge is presented as an example to demonstrate how this ap- proach works when the nonlinear soil-structure interaction is involved, and how the soil-structure interaction affect the results of the dynamic characteristics of the structure and seismic response,and how the spectrum analysis method can be combined with this method to conduct the soil-structure interaction analysis, which currently are generally performed using the time-history analysis, taking the M-N interaction curve of the piers and the soil strength and bearing capacity as the controlling elements, the traditional method are compared with the introduced method, upon which the conclusion shows that when the soft soil exists, the soil-structure dynamic interaction must be included.