設計合理的防屈曲支撐(BRB)具有良好的延性與耗能能力,但大幅軸向屈服后殘余變形較大。因此,本文設計了一種新型的組裝式碟簧自復位防屈曲支撐,并通過擬靜力試驗與數值模擬探索了其抗震性能。主要研究內容如下:(1)提出一種新型自復位防屈曲支撐(SCBRB)構造。給出了SCBRB的詳細構造,并分析了受力特性。據此設計了SCBRB試件。SCBRB支撐的復位力由受壓碟簧組合提供,耗能能力由BRB提供。BRB由中心的鋼板支撐、薄壁圓鋼管內填砂漿做外圍約束構件和二者間的無粘結材料組成。(2)對一個自復位支撐(SC)、一個防屈曲支撐(BRB)、兩個SCBRB進行了擬靜力試驗。試驗表明,與BRB相比,SCBRB呈現出旗幟型滯回曲線,殘余變形顯著減小。SC的滯回曲線也呈旗幟型,軸壓下碟簧組合間耗能能力較小。因構造上,無論SC還是BRB,都帶有上下部推拉塊(下部推拉塊的鋼管插入上部推拉塊的鋼管中)。水平往復加載下,支撐上下部推拉塊間具有一定的相互作用使其具有一定的抗側承載力和耗能能力。因此,水平加載時,SC試件具有一定的耗能能力,且BRB在鋼板內芯斷裂后隨著加載位移增長其仍有一定的承載力。(3)采用ABAQU...

【文章頁數】：153 頁

【學位級別】：碩士

【文章目錄】：
摘要
Abstract
Chapter1 Introduction
    1.1 Background
    1.2 Buckling Restrained Brace
    1.3 Self-Centering Energy Dissipation Brace
        1.3.1 Self-centering friction energy dissipation brace
        1.3.2 Self-centering buckling restrained brace
    1.4 Summary of self-centering system researches
    1.5 The source and main research contents
Chapter2 Design of Self-Centering Buckling Restrained Brace
    2.1 Overview
    2.2 Structural and mechanical properties of self-centering buckling restrained brace
        2.2.1 Structural and mechanical properties of the self-centering system
            2.2.1.1 Configuration of the self-centering system
            2.2.1.2 Disc spring combination
            2.2.1.3 Stress characteristic of the self-centering system
        2.2.2 Structural and mechanical properties of buckling restrained brace
            2.2.2.1 Configuration of buckling restrained brace
            2.2.2.2 Size of specimen inner core
            2.2.2.3 Force characteristics of buckling restrained brace
            2.2.2.4 Stiffness of the buckling restrained brace’s core
        2.2.3 Structural and mechanical properties of self-centering buckling restrained brace
            2.2.3.1 Configuration of self-centering buckling restrained brace
            2.2.3.2 Design of self-centering buckling restrained brace based on maximum loading capacity
            2.2.3.3 Design of self-centering ratio
            2.2.3.4 Design of pre-compression force of the self-centering system
            2.2.3.5 Design of axial displacement and bearing capacity of buckling restrained brace
    2.3 Design and prefabrication of specimens
        2.3.1 Design and prefabrication of self-centering system
            2.3.1.1 Design and prefabrication of compression disc spring system
            2.3.1.2 Design and prefabrication of lower and upper push-pull blocks
        2.3.2 Design and prefabrication of buckling restrained brace
            2.3.2.1 Design of buckling restrained brace’s inner core
            2.3.2.2 Design of restrained member of buckling restrained brace
            2.3.2.3 Design of clearance
            2.3.2.4 Pre-casted buckling restrained brace
        2.3.3 Design and prefabrication of end connection system
        2.3.4 Configuration assessment
    2.4 Material properties
        2.4.1 Steel
        2.4.2 Mortar
    2.5 Summary
Chapter3 Experimental Study on the Hysteretic Behavior of Self-Centering Buckling Restrained Brace
    3.1 Overview
    3.2 Composition and number of specimens
    3.3 Test scheme
        3.3.1 Specimen assembly
            3.3.1.1 Compression disc spring system assembly
            3.3.1.2 Self-centering specimen assembly
            3.3.1.3 Self-centering buckling restrained brace assembly
            3.3.1.4 Buckling restrained brace specimen assembly
        3.3.2 Test rig set up
        3.3.3 Specimen installation
    3.4 Loading scheme and measurement
    3.5 Test loading
    3.6 Experimental phenomenon and analysis
    3.7 Analysis of test result
        3.7.1 Hysteretic curve of the specimen
        3.7.2 Separation of the respective buckling restrained brace from the self-centering buckling restrained brace specimen
        3.7.3 Skeleton curve
        3.7.4 Bearing capacity and ductility
        3.7.5 Self-centering ratio analysis
        3.7.6 Residual deformation analysis
        3.7.7 Cumulative energy dissipation analysis
        3.7.8 Test result
    3.8 Summary
Chapter4 Finite Element Analysis on Hysteretic Behavior of Self-Centering Buckling Restrained Brace
    4.1 Overview
    4.2 Component modeling
        4.2.1 Disc spring
        4.2.2 Gasket
        4.2.3 Compression block
        4.2.4 Lower push-pull block
        4.2.5 Upper push-pull block
        4.2.6 Threaded Studs and nuts
    4.3 Assembly and simulation of the self-centering system
        4.3.1 Assembly of the self-centering system
        4.3.2 Simulation of self-centering system under axial load
    4.4 Assembly and simulation of buckling restrained brace
        4.4.1 Assembly and modeling of buckling restrained brace
        4.4.2 Simulation of the buckling restrained brace under axial load
    4.5 Assembly and simulation of self-centering buckling restrained brace under axial load
        4.5.1 Assembly of self-centering buckling restrained brace
        4.5.2 Simulation of self-centering buckling restrained brace under axial load
    4.6 Verified simulation and analysis
        4.6.1 The push-pull blocks interaction
        4.6.2 The self-centering system simulation in45°position
    4.7 Summary
Conclusions
References
Appendix
Acknowledgement



本文編號：3980626