基于試驗單元的多尺度有限元抗震混合試驗方法研究
發(fā)布時間：2019-01-20 08:48
【摘要】：為提高大型復雜建筑結(jié)構(gòu)抗震分析的精確性和可靠性,準確實現(xiàn)強震作用下結(jié)構(gòu)的非線性分析,本文將多尺度概念引入到混合試驗中提出了“多尺度有限元抗震混合試驗方法”。在多尺度有限元抗震混合試驗中,分別以試驗單元、宏觀計算單元和微觀計算單元模擬結(jié)構(gòu)整體的不同部分,通過不同尺度模型之間的協(xié)同分析與耦合,構(gòu)建多尺度有限元抗震混合試驗模型,進行整體結(jié)構(gòu)抗震非線性分析。針對結(jié)構(gòu)的多尺度有限元抗震混合試驗,本文的主要研究內(nèi)容如下：(1) 基于尺度離散和尺度間耦合的思想提出了多尺度有限元抗震混合試驗方法,指出了試驗平臺、有限元軟件和試驗控制系統(tǒng)的選取與組建方式,研究并闡述了多尺度有限元抗震混合試驗系統(tǒng)的構(gòu)建方法。(2)結(jié)構(gòu)的尺度離散方法直接影響著抗震分析的精確性,文中基于結(jié)構(gòu)的倒塌機理,提出了經(jīng)驗法和仿真法進行多尺度單元的選取,對大型復雜結(jié)構(gòu)應綜合考慮這兩種方法,進行試驗單元和計算單元的選取。(3)實現(xiàn)不同尺度間單元的耦合是多尺度有限元抗震混合試驗的關(guān)鍵,本文在研究試驗單元和計算單元特性的基礎(chǔ)上,基于多點約束方法實現(xiàn)了試驗單元和不同尺度計算單元連接界面自由度的協(xié)調(diào),同時基于OpenFresco混合試驗平臺,通過子程序的編寫和試驗系統(tǒng)的相關(guān)設(shè)置,詳細闡述了有限元軟件ABAQUS和MTS試驗控制系統(tǒng)的連接設(shè)置方法。考慮到多尺度有限元混合試驗中,試驗單元的邊界條件復雜,在多尺度界面連接的基礎(chǔ)上,通過對試驗單元的自由度縮減,實現(xiàn)試驗單元加載方式的簡化。(4)以一鋼框架為抗震研究對象,基于多點約束方法連接試驗單元部分和計算單元部分,構(gòu)建多尺度有限元抗震混合試驗模型,進行結(jié)構(gòu)的整體抗震分析。通過多尺度模型和有限元模型抗震分析結(jié)果的位移和加速度時程對比,驗證了基于多點約束的多尺度界面連接方法能夠很好地實現(xiàn)試驗單元和計算單元的多尺度界面連接,該方法可用于多尺度有限元混合試驗甚至是實時多尺度有限元混合試驗中。
[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.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU352.11
本文編號：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.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU352.11
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