采用界面单元的子结构混合试验方法研究

发布时间：2018-04-10 00:17

本文选题：界面单元　切入点：实壳耦合　出处：《中国地震局工程力学研究所》2017年硕士论文

【摘要】：子结构混合试验方法是抗震试验方法中的一项热门研究内容。该方法将结构中行为复杂的部分作为试验子结构进行试验获取准确的恢复力,其余部分在计算机中进行数值模拟,获得惯性力和阻尼力,不仅可以模拟结构在地震动作用下的动力响应,又能大大降低对加载装置动力性能的要求,减少了试验成本。子结构混合试验方法的核心问题在于不同子结构之间的边界协调,本文利用界面单元方法,对不同自由度耦合问题、支座激励问题、多点激励问题进行研究。在此基础上,研究粘弹性人工边界及地震动输入问题,以云南牛栏江大桥为例进行土结相互作用研究,验证界面单元方法的可行性。本文主要进行了以下工作:第一,针对子结构混合试验中不同子结构边界协调问题,提出界面单元方法,并引入静力凝聚与BFGS方法,实现多子结构不共节点的界面协调,并利用板板模型进行验证。第二,研究了实壳耦合中转换矩阵理论,将转换矩阵引入界面单元中实现了具有不同自由度子结构的边界耦合。建立ABAQUS板-梁模型,验证了该方法的可行性。第三,对界面单元方法进行支座激励分析时产生的问题进行研究,解决了界面单元方法支座激励与非支座激励之间算法的差别,并利用ABAQUS板梁的板激励模型进行验证。针对考虑行波效应的多点激励问题进行简单模拟,利用界面单元方法实现多点激励分析,并与ABAQUS整体分析结果对比。第四,研究粘弹性人工边界及其地震动输入方法,建立不同尺寸参数的ABAQUS二维、三维土体模型,验证了粘弹性人工边界地震动输入方法的准确性。第五,采用ABAQUS建立了牛栏江大桥桥体模型,利用粘弹性人工边界的方法,建立考虑土结相互作用的ABAQUS土-桥模型,实现土体边界的地震动输入。
[Abstract]:The substructure mixed test method is one of the hot research contents in the seismic test method.In this method, the complex part of the structure is used as the test substructure to obtain the accurate restoring force, and the rest is numerically simulated in the computer to obtain the inertia force and damping force.It can not only simulate the dynamic response of the structure under ground motion, but also greatly reduce the requirements for the dynamic performance of the loading device and reduce the test cost.The key problem of the substructure hybrid test method is the boundary coordination between different substructures. In this paper, the coupling problem of different degrees of freedom, the support excitation problem and the multi-point excitation problem are studied by using the interface element method.On this basis, the viscoelastic artificial boundary and the input of ground motion are studied. The interaction of soil junction is studied by taking Niulianjiang Bridge in Yunnan Province as an example, and the feasibility of the interface element method is verified.The main work of this paper is as follows: first, aiming at the problem of boundary coordination of different substructures in substructure mixing test, an interface element method is proposed, and the static coacervation and BFGS method are introduced to realize the interface coordination of multi-substructure non-common nodes.The plate model is used to verify the model.Secondly, the theory of transition matrix in real shell coupling is studied. The transformation matrix is introduced into the interface element to realize the boundary coupling with different degrees of freedom substructures.The ABAQUS plate-beam model is established, and the feasibility of the method is verified.Thirdly, the problems arising from the support excitation analysis of the interface element method are studied, and the difference between the support excitation algorithm and the non-support excitation algorithm of the interface element method is solved, which is verified by the plate excitation model of the ABAQUS plate beam.The multi-point excitation problem considering traveling wave effect is simply simulated. The interface element method is used to realize the multi-point excitation analysis, and the results are compared with that of ABAQUS.Fourthly, the viscoelastic artificial boundary and its seismic input method are studied, and the ABAQUS two-dimensional and three-dimensional soil mass models with different parameters are established to verify the accuracy of the viscoelastic artificial boundary seismic input method.Fifthly, the bridge body model of Niulanjiang Bridge is established by using ABAQUS, and the ABAQUS soil-bridge model considering the interaction of soil junctions is established by using the viscoelastic artificial boundary method to realize the ground motion input of the soil boundary.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU317

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