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为给考虑桥台非线性行为的桥梁整体抗震设计提供参考,针对非线性土-桥台-桥梁结构相互作用,采用土的双曲线应力-应变关系,给出了桥台纵桥向非线性力-位移行为;并基于全尺寸桥台试验数据,提出了一种桥台非线性力-位移关系的双曲线简化适用计算公式;将此简化公式应用于有限元模型中,分析了桥梁上部结构-桥台背墙-回填土相互作用对桥梁结构地震反应的影响。结果表明:给出的预测模型和简化公式可准确评估桥台纵桥向非线性力-位移能力,且便于应用到桥梁抗震设计中;桥台非线性力-位移滞回性能对桥梁结构地震反应影响显著,在桥梁抗震设计中应合理考虑。
In order to provide a reference for the overall seismic design of bridges considering the nonlinear behavior of bridge abutments, the hyperbolic stress-strain relationship of soil is given for the nonlinear soil-abutment-bridge structure interaction. Based on the experimental data of full-scale abutment, a simplified hyperbola formula for calculating the nonlinear force-displacement relationship of abutment is proposed. The simplified formula is applied to the finite element model, and the analysis of the superstructure of the bridge- Influence of abutment back - wall - backfill soil interaction on seismic response of bridge structures. The results show that the predictive model and the simplified formula can accurately evaluate the nonlinear force-displacement ability of longitudinal bridge and can be easily applied to the seismic design of bridge. The nonlinear response of bridge abutment to the seismic response of bridge structure Significant impact, in the seismic design of the bridge should be reasonable consideration.