考虑多点激励的桥梁结构远程协同拟动力试验平台开发

发布时间：2019-05-22 06:11

【摘要】：结构远程协同拟动力试验利用互联网通讯手段将分布于异地的实验室联合起来形成一个功能强大的综合性网络结构实验室。可以实现所连接实验室之间软硬件设施的资源共享从而完成单个实验室难以完成的大型综合复杂试验。因此为大跨度、大尺寸的桥梁结构抗震性能研究提供了一种新的方法。大量研究表明,作为长跨结构的桥梁在地震作用过程中考虑各支承处地震波的非一致性更加符合实际情况。本文基于前期研究工作,研究多点激励下的拟动力试验方法,并在此基础上对远程协同拟动力试验平台进行进一步的开发。(1)介绍了桥梁结构多点激励问题研究的必要性及其意义,详细阐述了多点激励时程分析的基本方法；针对远程协同试验方面,介绍了网络化结构实验室NetSLab系统,包括该系统的基本结构、数据模型以及其程序的开发原理。(2)桥梁结构弹塑性时程分析程序的开发。在考虑多点激励以及对桥梁结构计算模型研究的基础上,编写了桥梁结构整体非线性时程分析程序；并以一个三跨梁式桥在多点激励下的反应分析为例,将自编程序与商业有限元软件对比,验证所编程序的正确性及可靠性,为远程协同拟动力试验平台的开发提供数值计算支持。同时,对比了一致激励下与非一致激励下结构时程分析的部分结果,说明结构地震反应分析中应根据实际情况对结构多点激励问题进行考虑是有必要的。(3)桥梁结构远程协同拟动力试验平台的开发。在传统子结构拟动力试验方法研究的基础上建立了基于多点激励下桥梁结构远程协同拟动力试验的方法。并以一个三跨梁式桥在多点激励作用下为算例,在分别取出桥墩及支座为试验子结构的基础上,研究试验子结构及计算子结构的刚度矩阵形成过程,同时讨论了边界条件的模拟问题。进行了一系列远程虚拟试验,并将其结果与结构整体非线性时程分析对比,进一步验证试验平台的可靠性。(4)针对远程协同试验的进一步发展以及对远程协同试验平台的进一步完善提出下一步研究工作。
[Abstract]:The remote cooperative dynamic test of structure combines the laboratories distributed in different places to form a powerful comprehensive network structure laboratory by means of Internet communication. The resource sharing of hardware and software facilities between the connected laboratories can be realized so as to complete the large-scale comprehensive and complex experiments that are difficult to complete by a single laboratory. Therefore, a new method is provided for the study of seismic performance of long-span and large-size bridge structures. A large number of studies show that it is more in line with the actual situation that the bridge as a long-span structure takes into account the inconsistency of seismic waves at each support in the process of seismic action. In this paper, based on the previous research work, the quasi-dynamic test method under multi-point excitation is studied. On this basis, the remote collaborative dynamic test platform is further developed. (1) the necessity and significance of studying the multi-point excitation problem of bridge structure are introduced, and the basic method of multi-point excitation time history analysis is expounded in detail. Aiming at the remote collaborative test, this paper introduces the NetSLab system of networked structure laboratory, including the basic structure of the system, the data model and the development principle of its program. (2) the development of elastic-plastic time history analysis program for bridge structure. On the basis of considering multi-point excitation and studying the calculation model of bridge structure, the whole nonlinear time history analysis program of bridge structure is compiled. Taking the response analysis of a three-span beam bridge under multi-point excitation as an example, the correctness and reliability of the program are verified by comparing the self-programmed program with the commercial finite element software. It provides numerical calculation support for the development of remote collaborative dynamic test platform. At the same time, some results of structural time history analysis under uniform excitation and non-uniform excitation are compared. It is necessary to consider the problem of multi-point excitation according to the actual situation in the seismic response analysis of structures. (3) the development of remote collaborative dynamic test platform for bridge structures. Based on the research of traditional substructure quasi-dynamic test method, a remote cooperative quasi-dynamic test method of bridge structure based on multi-point excitation is established. Taking a three-span beam bridge under multi-point excitation as an example, on the basis of taking the pier and support as the experimental substructure respectively, the formation process of the stiffness matrix of the experimental substructure and the calculated substructure is studied. At the same time, the simulation of boundary conditions is discussed. A series of remote virtual experiments are carried out, and the results are compared with the nonlinear time history analysis of the whole structure. The reliability of the test platform is further verified. (4) in view of the further development of remote collaborative test and the further improvement of remote collaborative test platform, the next research work is put forward.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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