支盘桩-土-结构相互作用体系的计算分析
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摘要
以支盘桩-地基-结构动力相互作用振动模型试验为基础,结合通用有限元程序MARC,对桩-土结构动力相互作用体系进行了三维有限元分析。计算与试验得出的规律基本一致。由于上部结构的摆动造成一侧受拉一侧受压,从而出现拉拔现象,使桩基与土体发生了脱开再闭合甚至还发生了滑移。桩身的应变幅值呈桩顶大、桩底小的倒三角形分布。桩土接触压力在靠近桩两端部分较大而在桩体中部较小,大体呈K形分布。各支盘中,下部所承受的压力值要明显大于上部。角桩的应力、应变幅值要明显大于中桩。通过计算分析与试验的对照研究,验证了采用的计算模型与分析方法的合理性,为结构-地基动力相互作用的进一步研究奠定了基础。
Based on squeezed branch pile-soil-structure dynamic interaction shaking table model test and using general-purpose finite element program MARC,some analysis about modeling of soil-structure interaction(SSI) system are discussed in this paper.Issues drawn from computational analysis are consistent with test results.Because of up-structure swinging,one side is pulled,the other side is pressed.The phenomena of separation,reclosing and sliding occur between pile foundation and soil.The distribution of the strain amplitude along the pile is the shape where the large strain is at the top of the pile and the small strain is at the tip of the pile.The distribution of the contact pressure on the pile-soil interface is larger at the end than in the middle.The general shape is "K" distribution.In every pile,the down part pressure is bigger than the up part.The strain and pressure amplitude of pile at corners are bigger than middle pile.The rationality of computational model and analysis method is verified through comparison research between calculation and test results.The present work lays a foundation for further research on SSI.
Based on squeezed branch pile-soil-structure dynamic interaction shaking table model test and using general-purpose finite element program MARC,some analysis about modeling of soil-structure interaction(SSI) system are discussed in this paper.Issues drawn from computational analysis are consistent with test results.Because of up-structure swinging,one side is pulled,the other side is pressed.The phenomena of separation,reclosing and sliding occur between pile foundation and soil.The distribution of the strain amplitude along the pile is the shape where the large strain is at the top of the pile and the small strain is at the tip of the pile.The distribution of the contact pressure on the pile-soil interface is larger at the end than in the middle.The general shape is "K" distribution.In every pile,the down part pressure is bigger than the up part.The strain and pressure amplitude of pile at corners are bigger than middle pile.The rationality of computational model and analysis method is verified through comparison research between calculation and test results.The present work lays a foundation for further research on SSI.
引文
1]王东坡.支盘桩-地基-结构相互作用体系的振动台试验研究[D].合肥:合肥工业大学,2005.
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2]钱德玲,雷超,王东坡,等.相互作用体系中桩基的动力响应[J].岩土工程学报.2006,28(6):709-714.
3]楼梦麟,林皋.粘弹性地基中人工边界的波动反射效应[J].水利学报,1986(6):20-30.
4]陈波,吕西林,李培振,等.用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.
5]钱德玲.变截面桩与土的相互作用原理[M].合肥:合肥工业大学出版社,2003.
6]陈波,吕西林,李培振,等.均匀土-桩基-结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91-99.
7]钱德玲,孙昌玲.一种新型桩-土-结构体系抗震性能的研究[J].合肥工业大学学报,2005,28(1):251-255.
8]钱德玲,赵元一,王东坡.桩-土-结构体系动力相互作用的试验研究[J].上海交通大学学报,2005,39(11):1856-1861.
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