斜拉桥抗震性能分析与提高

发布时间：2023-01-15 15:46

　　考虑到斜拉桥在建设过程中大量成本的投入以及发生地震时带来的风险,本论文将通过研究提出一些适当的方法来显著降低地震时结构坍塌的风险。在本文研究中,讨论了现有斜拉桥的抗震性能。通过提高桥梁抗震性能的机理,提出了改进桥梁抗震的方法。在本文分析中,桥梁的三维有限元模型通过在SAP2000软件中建立,以进行桥梁地震响应分析。本论文深入讨论了改进方法,作为增强桥梁抗震性能的方式。然后采用非线性时程分析方法,研究了三种不同的斜拉桥布置形式在El-Centro地震波作用下的地震响应。在第一种布置形式中,对按原有设计参数的桥梁在地震荷载和恒载作用下的动力响应进行了分析,并通过ERS系统对桥梁进行了改进。改进ERS系统涉及塔架连接处的流体粘滞阻尼器和墩台位置处的铅芯橡胶隔离支座。并对桥梁的关键参数进行了比较分析。数值结果的对比分析表明:在应用改进方法后,桥梁的抗震性能有了显着的提高。数值结果表明,被动控制阻尼器是控制由桥梁地震响应的有效构件,塔底弯矩,基础响应和塔底剪力与未进行改进的桥梁相比其地震响应显著降低。此外,分析结果表明,通过LRB对基础进行隔离的桥梁,地震对其造成的破坏会大大降低,并且LRB能够... 

【文章页数】：90 页

【学位级别】：硕士

【文章目录】：
ACKNOWLEDGEMENTS
摘要
ABSTRACT
LIST OF SYMBOLS AND ABBREVIATIONS
Chapter 1: INTRODUCTION
    1.1 RESEARCH AREA DESCRIPTION
    1.2 EARTHQUAKE RECORDS IN THE EAST AFRICAN RIFT VALLEY
    1.3 PROBLEM STATEMENT
    1.4 RESEARCH OBJECTIVES
    1.5 SIGNIFICANCE OF STUDY
    1.6 THE SCOPE OF THE STUDY
Chapter 2: LITERATURE REVIEW
    2.1. GENERAL
    2.2. BRIDGE STRUCTURES SEISMIC ANALYSIS
    2.3. MATHEMATICAL APPROACH: THE SYSTEM DYNAMICS
    2.4. ELASTIC ANALYSIS
        2.4.1 Direct Response History Analysis: DRHA
    2.5. INELASTIC ANALYSIS
    2.6. BRIDGES DYNAMIC ANALYSIS METHODS
        2.6.1 Modal analysis
    2.7. STATIC ANALYSIS FOR GRAVITY LOADS
    2.8. DESIGN METHODS FOR BRIDGE STRUCTURES UNDER SEISMIC LOADS
        2.8.1 Force-Based Method
        2.8.2 Displacement-Based Method
    2.9. METHODS FOR SEISMIC CONTROL OF CABLE-STAYED BRIDGES
        2.9.1 Introduction of supplementary dampers
        2.9.2 Application of base isolation system
Chapter 3: METHODOLOGY
    3.1 ANALYSIS OF CABLE-STAYED BRIDGES
        3.1.1 Preliminary design
        3.1.2 Stayed Cable Forces
    3.2 METHODS OF ANALYSIS
        3.2.1. Static analysis
        3.2.2. Dynamic analysis
    3.3 DYNAMIC CHARACTERISTICS OF A CABLE-STAYED BRIDGE
    3.4 GEOMETRY AND MATERIALS DESCRIPTION OF THE REFERENCE BRIDGE
    3.5 PERFORMANCE REQUIREMENTS AND DESIGN ISSUES OF CABLE-STAYEDBRIDGE
    3.6 CABLE-STAYED BRIDGE STRUCTURAL CONTROL
    3.7 STRUCTURAL CONTROL STRATEGY
    3.8 THE PASSIVE CONTROL SYSTEM OF BRIDGE STRUCTURAL SYSTEM
        3.8.1. Fluid Viscous Dampers
    3.9 CABLE-STAYED BRIDGE STRUCTURAL CONTROL ISSUES
        3.9.1. Foundation Isolation
        3.9.2. Pylon Control
        3.9.3. Deck Control
        3.9.4. Cable Control
    3.10 SAP2000 SOFTWARE
    3.11 STRUCTURAL MODELLING OF CABLE-STAYED BRIDGE
        3.11.1. Finite element model
        3.11.2. Modeling of deck Element
        3.11.3. Modeling of Cables
        3.11.4. Modeling of piers and abutments
        3.11.5. Modeling of towers
        3.11.6. Assumptions made in the models
    3.12 TRAFFIC TRUCK AND CARS LIVE LOADS
    3.13 EARTHQUAKE GROUND MOTIONS
    3.14 MODELS OF REFERENCED CABLE-STAYED BRIDGE
        3.14.1. Original Structural Modeling-first model
        3.14.2. Modeling of bridge structure retrofitted with isolation systems
        3.14.3. Validation of the SAP2000 software
Chapter 4 RESULTS OF ANALYSIS AND COMPARISON ANALYSIS
    4.1 RESULTS OF STATIC LOAD ANALYSIS
        4.1.0. Mode shapes of the referenced bridge under static loads
        4.1.1. Deck displacement
        4.1.2. Summary of Static analysis results
    4.2 RESULTS OF SEISMIC LOADS AND MOVING VEHICULAR LOAD ANALYSIS
        4.2.1. Retrofit of the bridge with fluid viscous dampers (FVD's)
        4.2.2. Retrofit of the bridge with lead rubber bearing's (LRB's)
    4.3 COMPARISON ANALYSIS
        4.3.1. Deck displacement at the main span
        4.3.2. Maximum deck moment
        4.3.3. The moment at Pylon bottom
        4.3.4. Base reaction
        4.3.5. Pylon deflection at the top
        4.3.6. Shear forces at pylon bottom
        4.3.7. Cable maximum forces
        4.3.8. Input Energy
Chapter 5 CONCLUSION AND RECOMMENDATIONS FOR FURTHER STUDIES
    5.1 CONCLUSION
    5.2 RECOMMENDATIONS FOR FURTHER STUDIES
REFERENCES
APPENDICES
Author's Resume
数据集



本文编号：3731211