水平单调载荷作用下的桩基桥墩滞回特性
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摘要
为研究桩基桥墩—地基系统的非线性性能,根据模型与原型的物理相似关系制作1∶5比例的桩基桥墩模型.采用力—位移混合控制加载的拟静力试验方法,通过在墩顶施加水平单调增加载荷,得到墩顶水平载荷下桩基桥墩的载荷—位移滞回曲线、骨架曲线和滞回特性.用非线性弹簧单元模拟土体、用梁单元模拟桩和桥墩,建立模型桥墩的计算模型.计算模型的骨架曲线与试验模型的骨架曲线吻合较好,表明采用非线性弹簧单元和梁单元分别模拟土体和桩是可行的,可以为考虑土—结构相互作用时的桥梁抗震分析提供参考依据.
To study the nonlinear performance of pile-supported bridge pier-foundation system,a 1∶5 scale pile-supported bridge pier model is built according to the physical similarity between the prototype and the model. The hysteretic curves,skeleton curves and hysteretic characteristics of load-displacement of pile-supported bridge piers under level monotonic load are obtained by using the pseudo-static test method that uses the force-displacement control load and imposing load on the top of the pier. The computation model is built for the model of the pier by using nonlinear spring element to simulate soil and beam element to simulate piers and piles. The skeleton curves of the computation model is well in agreement with the one of the test model and it is shown that it is feasible to use nonlinear spring element to simulate soil and beam element to simulate piles,and so it can provide reference for the analysis on the seismic resistance of bridges considering soil-structure interaction.
To study the nonlinear performance of pile-supported bridge pier-foundation system,a 1∶5 scale pile-supported bridge pier model is built according to the physical similarity between the prototype and the model. The hysteretic curves,skeleton curves and hysteretic characteristics of load-displacement of pile-supported bridge piers under level monotonic load are obtained by using the pseudo-static test method that uses the force-displacement control load and imposing load on the top of the pier. The computation model is built for the model of the pier by using nonlinear spring element to simulate soil and beam element to simulate piers and piles. The skeleton curves of the computation model is well in agreement with the one of the test model and it is shown that it is feasible to use nonlinear spring element to simulate soil and beam element to simulate piles,and so it can provide reference for the analysis on the seismic resistance of bridges considering soil-structure interaction.
引文
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[2]杨光,张树山,崔军.地基与重力式桥墩相互作用的非线性地震反应[J].哈尔滨工业大学学报,2003,35(10):1278-1280.
[3]谭国宏.客运专线桥墩—基础非线性性能的模型试验研究[D].兰州:兰州交通大学,2007.
[4]林皋,朱彤,林蓓.结构动力模型试验的相似技巧[J].大连理工大学学报,2000,40(1):1-8.
[5]日本铁道技术综合研究所.铁道构造物等设计标准及解说,抗震设计[S].东京:日本铁道技术综合研究所,1999.
[6]日本铁道技术综合研究所.铁道构造物等设计标准及解说,混凝土构造物[S].东京:日本铁道技术综合研究所,1999.
[7]日本铁道技术综合研究所.铁道构造物等设计标准及解说,基础构造物与抗土压构造物[S].东京:日本铁道技术综合研究所,1999.
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