市政技术2026，Vol.44Issue(9)：66-71,131,7.DOI:10.19922/j.1009-7767.2026.09.066
基于等效静力与简化脉冲响应的高架桥-桩基体系抗风性能研究
Study on Wind Resistance Performance of Viaduct-Pile Foundation System Based on Equivalent Static Force and Simplified Impulse Response
苏尔想1
作者信息
- 1. 温州信达交通工程试验检测有限公司,浙江温州 325100
- 折叠
摘要
Abstract
To evaluate the global response of a viaduct-pile foundation system in coastal soft soil areas under design strong winds,a 3D finite element model consisting of bridge,pier,cap,pile foundation and layered soil mass is es-tablished with the Wenzhou Municipal Railway Line S3 as the engineering background.The transverse direction of the bridge deck is defined as the wind pressure loading direction.Wind pressure height variation is considered for a representative height of 15 m and terrain roughness category A,yielding a design wind pressure of 0.681 6 kN/m2.The beam-pier connection is simplified as rigid joint,and the pile-soil interaction is simulated by contact algorithm.Based on the fact that the cumulative mass participation factor of the first 20 modes exceeds 90％and the first-order frequency is 0.32 Hz(corresponding to a fundamental period of approximately 3.13 s),a single half-sine wind pressure pulse with a duration of 3 s is applied.The results are compared with those under the equivalent static load case and graded wind pressure ranging from 0.2 to 1.0 times the design value.The results show that the peak transverse dis-placement at the bridge top reaches 4.216 mm under the equivalent static case,and the displacement response in-creases nearly linearly with wind pressure.Under the single half-sine wind pressure pulse,the peak transverse dis-placement at the bridge top is 2.2～2.3 mm.The deformations in both cases gradually attenuate from the superstruc-ture down to the pile foundation and deep soil.Under the adopted design wind pressure and simplified pulse condi-tions,the viaduct-pile foundation system remains in a small-deformation state.It should be specially noted that the transient analysis results only reflect the response characteristics under this specific pulse case and cannot replace refined dynamic analysis under the random wind field of real typhoons.关键词
滨海软土/高架桥/桩基/设计风荷载/半正弦风压脉冲/等效静力/瞬态响应Key words
coastal soft soil/viaduct/pile foundation/design wind load/half-sine wind pressure pulse/equivalent static force/transient response分类
交通工程引用本文复制引用
苏尔想..基于等效静力与简化脉冲响应的高架桥-桩基体系抗风性能研究[J].市政技术,2026,44(9):66-71,131,7.
