考虑桩-土相互作用的不等高墩桥地震响应分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 114-120.

论文

吕杨1,刘喆1,李忠献1,2

作者信息 +

SEISMIC ANALYSIS OF UNEQUAL HEIGHT PIER BRIDGE CONSIDERING SOIL-PILE INTERACTION

LV Yang 1, LIU Zhe 1, LI Zhong-xian 1,2

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文章历史 +

摘要

基于LS-DYNA有限元软件的二次开发功能，引入p-y桩土动力相互作用模型和钢材的Bonora损伤本构模型。以某大桥四跨引桥为研究对象，建立了包括考虑土-结构相互作用的Winkler地基梁模型、有效桩长模型、全桩长模型，以及不考虑土-结构相互作用的无桩模型等四种桩基础分析模型和上部结构弹塑性损伤分析模型。通过场地自由场求解，在桩侧节点上施加相应位置的加速度时程，对基于四种桩基础模型的该大桥进行了自振特性以及在小震、中震和大震下的位移、加速度、内力、损伤分析，并探讨了Winkler地基梁模型不同深度下桩-土p-y模型的应力-应变关系和桩身变形特性。结果表明，桩基础数值分析模型对结构整体响应影响显著，不等高墩桥顺桥向与横桥向响应差距大，所开发的p-y模型可用于桥梁结构精细化数值分析。

Abstract

Based on the secondary development of LS-DYNA program, the nonlinear dynamic p-y model and the Bonora damage material model of steel were applied into the main program. Taking a four-span approach bridge as an example, the plastic damage model of the upper bridge and four simplified bridge pile-foundation models, including Beam on Winkler Foundation model, effective length pile model, total pile model considering soil-structure interaction and no pile model were introduced. The earthquake motions obtained by free-field analysis were applied to the different depth of pile profile. The free vibration characteristics, displacement, acceleration, internal force and damage under different levels of earthquake motions were analyzed. The stress-strain curve of different depth of p-y elements and pile deflection of Winkler-methods model were discussed. Analysis results indicated that the structure responses are different among the four pile-foundation models, the responses of the bridge in longitudinal and transverse directions are totally different, and the p-y model can be used to simulate the bridge precisely.

导出引用

吕杨1,刘喆1,李忠献1,2. 考虑桩-土相互作用的不等高墩桥地震响应分析[J]. 振动与冲击, 2016, 35(23): 114-120

LV Yang 1, LIU Zhe 1, LI Zhong-xian 1,2. SEISMIC ANALYSIS OF UNEQUAL HEIGHT PIER BRIDGE CONSIDERING SOIL-PILE INTERACTION[J]. Journal of Vibration and Shock, 2016, 35(23): 114-120

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