| 基坑桩地震冲击下的受力分析模型仿真 |
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| 引用本文： | 张富.基坑桩地震冲击下的受力分析模型仿真[J].西北地震学报,2018,40(3):466-472. |
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| 作者姓名： | 张富 |
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| 作者单位： | 南充职业技术学院土木与建筑工程系 |
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| 基金项目： | 国家自然科学基金（51304169） |
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| 摘 要： | 当前利用改进动力Winkler模型分析基坑桩地震冲击下的受力情况,不能预防应力波的反射作用,导致其分析结果具有不全面、准确性低的缺点。本论述提出有限元数值模拟的基坑桩地震冲击下的受力分析模型,通过基坑桩小应变模型描述不同应力状态下基坑桩模量的变化,采用有限元数值模拟方法结合基坑桩小应变模型对基坑桩有限元模型进行塑造。在约束基坑桩有限元模型边界条件时,模型选择黏性阻尼器的吸收边界,使模型边界上的应力波不会遭到折射,避免运算结果出现误差。利用Newmark方法对基坑桩有限元模型进行动力时程分析,实现基坑桩在不同应力状态下的受力分析。实验结果证明:所提模型能够有效、准确的对地震冲击下的基坑应力分布、基坑桩身弯曲度、变形位移以及桩体水平位移差值对比等进行全面的分析。
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| 关 键 词： | 基坑桩 地震冲击 受力分析 数值模拟 有限元模型 动力时程 |
| 收稿时间： | 2017/8/20 0:00:00 |
Simulation of Force Analysis Model for Foundation Pit Pile under Seismic Impact |
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| ZHANG Fu.Simulation of Force Analysis Model for Foundation Pit Pile under Seismic Impact[J].Northwestern Seismological Journal,2018,40(3):466-472. |
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| Authors: | ZHANG Fu |
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| Institution: | Department of Civil and Architectural Engineering, Nanchong Vocational and Technical College, Nanchong 637131, Sichuan, China |
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| Abstract: | At present, when using the improved dynamic Winkler model to analyze the stress conditions of foundation pit piles from earthquake shock, the reflection effect of the stress wave cannot be prevented, which renders the analysis result noncomprehensive and inaccurate. In this paper, we propose a stress analysis model for foundation pit piles subjected to seismic impact. We use a small strain model for foundation pit piles to describe the modulus change of the pile under different stress states, and use the finite element numerical simulation method to establish a finite element model for foundation pit piles in combination with the small strain model. When setting the boundary condition constraints of the finite element model for foundation pit piles, we choose an absorbent boundary of viscous dampers to prevent the refraction of the stress wave on the model boundary, and thereby avoid calculation error. We use the Newmark method to analyze the dynamic time history of the finite element model and determine the stress of foundation pit piles under different stress states. The experimental results show that the proposed model can effectively and accurately analyze the stress distributions of foundation pits and the bending moments and deformation displacements of the piles. |
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| Keywords: | foundation pit pile seismic impact stress analysis numerical simulation finite element model dynamic time history |
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