基于试验单元的多尺度有限元抗震混合试验方法研究
发布时间：2019-01-20 08:48
【摘要】：为提高大型复杂建筑结构抗震分析的精确性和可靠性,准确实现强震作用下结构的非线性分析,本文将多尺度概念引入到混合试验中提出了“多尺度有限元抗震混合试验方法”。在多尺度有限元抗震混合试验中,分别以试验单元、宏观计算单元和微观计算单元模拟结构整体的不同部分,通过不同尺度模型之间的协同分析与耦合,构建多尺度有限元抗震混合试验模型,进行整体结构抗震非线性分析。针对结构的多尺度有限元抗震混合试验,本文的主要研究内容如下：(1) 基于尺度离散和尺度间耦合的思想提出了多尺度有限元抗震混合试验方法,指出了试验平台、有限元软件和试验控制系统的选取与组建方式,研究并阐述了多尺度有限元抗震混合试验系统的构建方法。(2)结构的尺度离散方法直接影响着抗震分析的精确性,文中基于结构的倒塌机理,提出了经验法和仿真法进行多尺度单元的选取,对大型复杂结构应综合考虑这两种方法,进行试验单元和计算单元的选取。(3)实现不同尺度间单元的耦合是多尺度有限元抗震混合试验的关键,本文在研究试验单元和计算单元特性的基础上,基于多点约束方法实现了试验单元和不同尺度计算单元连接界面自由度的协调,同时基于OpenFresco混合试验平台,通过子程序的编写和试验系统的相关设置,详细阐述了有限元软件ABAQUS和MTS试验控制系统的连接设置方法。考虑到多尺度有限元混合试验中,试验单元的边界条件复杂,在多尺度界面连接的基础上,通过对试验单元的自由度缩减,实现试验单元加载方式的简化。(4)以一钢框架为抗震研究对象,基于多点约束方法连接试验单元部分和计算单元部分,构建多尺度有限元抗震混合试验模型,进行结构的整体抗震分析。通过多尺度模型和有限元模型抗震分析结果的位移和加速度时程对比,验证了基于多点约束的多尺度界面连接方法能够很好地实现试验单元和计算单元的多尺度界面连接,该方法可用于多尺度有限元混合试验甚至是实时多尺度有限元混合试验中。
[Abstract]:In order to improve the accuracy and reliability of seismic analysis of large and complex building structures, the nonlinear analysis of structures under strong earthquake can be realized accurately. In this paper, the concept of multi-scale finite element seismic mixing test is introduced into the mixed test. In the multi-scale finite element seismic hybrid test, the different parts of the whole structure are simulated by the test element, the macro-computing element and the micro-computing element, respectively, and the cooperative analysis and coupling between the different scale models are carried out. A multi-scale finite element seismic hybrid test model is constructed to analyze the nonlinear seismic behavior of the whole structure. The main contents of this paper are as follows: (1) based on the idea of scale discretization and scale coupling, a multi-scale finite element seismic hybrid test method is proposed, and the test platform is pointed out. Based on the selection and construction of finite element software and test control system, the construction method of multi-scale finite element seismic hybrid test system is studied and expounded. (2) the accuracy of seismic analysis is directly affected by the scale discretization method of structure. In this paper, based on the collapse mechanism of structures, the empirical method and simulation method are proposed to select multi-scale elements. These two methods should be considered comprehensively for large and complex structures. (3) the key of multi-scale finite element seismic hybrid test is to realize the coupling of different scale elements. In this paper, the characteristics of the test unit and the calculation element are studied. Based on the multi-point constraint method, the coordination of the degree of freedom of the interface between the test unit and the calculation unit with different scales is realized. At the same time, based on the OpenFresco hybrid test platform, the subroutine is compiled and the relevant settings of the test system are set up. The connection setting method of finite element software ABAQUS and MTS test control system is described in detail. Considering that the boundary condition of the test unit is complex in the multi-scale finite element mixing test, the degree of freedom of the test unit is reduced on the basis of the multi-scale interface connection. The loading mode of test elements is simplified. (4) taking a steel frame as the seismic research object, the multi-scale finite element seismic hybrid test model is constructed based on the multi-point constraint method to connect the test unit part with the calculation element part. The whole seismic analysis of the structure is carried out. Through the comparison of displacement and acceleration time history between the seismic analysis results of multi-scale model and finite element model, it is verified that the multi-scale interface connection method based on multi-point constraint can realize the multi-scale interface connection between test unit and computational element. This method can be used in multi-scale finite element mixing test or real-time multi-scale finite element hybrid test.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
本文编号：2411868
[Abstract]:In order to improve the accuracy and reliability of seismic analysis of large and complex building structures, the nonlinear analysis of structures under strong earthquake can be realized accurately. In this paper, the concept of multi-scale finite element seismic mixing test is introduced into the mixed test. In the multi-scale finite element seismic hybrid test, the different parts of the whole structure are simulated by the test element, the macro-computing element and the micro-computing element, respectively, and the cooperative analysis and coupling between the different scale models are carried out. A multi-scale finite element seismic hybrid test model is constructed to analyze the nonlinear seismic behavior of the whole structure. The main contents of this paper are as follows: (1) based on the idea of scale discretization and scale coupling, a multi-scale finite element seismic hybrid test method is proposed, and the test platform is pointed out. Based on the selection and construction of finite element software and test control system, the construction method of multi-scale finite element seismic hybrid test system is studied and expounded. (2) the accuracy of seismic analysis is directly affected by the scale discretization method of structure. In this paper, based on the collapse mechanism of structures, the empirical method and simulation method are proposed to select multi-scale elements. These two methods should be considered comprehensively for large and complex structures. (3) the key of multi-scale finite element seismic hybrid test is to realize the coupling of different scale elements. In this paper, the characteristics of the test unit and the calculation element are studied. Based on the multi-point constraint method, the coordination of the degree of freedom of the interface between the test unit and the calculation unit with different scales is realized. At the same time, based on the OpenFresco hybrid test platform, the subroutine is compiled and the relevant settings of the test system are set up. The connection setting method of finite element software ABAQUS and MTS test control system is described in detail. Considering that the boundary condition of the test unit is complex in the multi-scale finite element mixing test, the degree of freedom of the test unit is reduced on the basis of the multi-scale interface connection. The loading mode of test elements is simplified. (4) taking a steel frame as the seismic research object, the multi-scale finite element seismic hybrid test model is constructed based on the multi-point constraint method to connect the test unit part with the calculation element part. The whole seismic analysis of the structure is carried out. Through the comparison of displacement and acceleration time history between the seismic analysis results of multi-scale model and finite element model, it is verified that the multi-scale interface connection method based on multi-point constraint can realize the multi-scale interface connection between test unit and computational element. This method can be used in multi-scale finite element mixing test or real-time multi-scale finite element hybrid test.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
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