【作者】 刘伟；

【导师】 潘盛山；

【作者基本信息】 大连理工大学 ， 桥梁与隧道工程， 2020， 硕士

【摘要】 地震灾害对城市基础设施影响日益严重,桥梁抗震设计因此变得尤为关键。自复位预制装配式桥墩由于采用了预制装配式结构,将墩柱与承台分离,由预应力钢束相连接产生预加轴压比,发生地震作用时桥墩开始摇摆,耗能构件通过变形耗能吸收地震能量,从而有效避免地震作用对桥墩的严重损坏。墩柱和承台之间的界面由于不断发生摇摆开合作用,会导致墩柱底部有不同程度的损伤,本文基于ABAQUS数值分析平台,针对自复位预制装配式桥墩界面展开研究,建立两种摇摆界面加固模型,推导摇摆界面受压区面积公式,并验证自复位桥墩对比传统桥墩优越的抗震性能。本文主要研究内容和创新如下:(1)介绍自复位预制装配式桥墩发展历史,总结国内外学者对于自复位预制装配式桥墩结构形式研究历程,详细阐述摇摆界面几种不同加固方法及其发展历程。(2)基于ABAQUS软件,建立自复位预制装配式桥墩精细化模型,结合拟静力方法验证自复位预制装配式桥墩对比传统式整体混凝土桥墩所具有的抗震性能优势,详细介绍自复位预制装配式桥墩结构组成和各部件设计方法。(3)针对摇摆界面受损状况提出两种加固方法,即提高墩柱底部混凝土强度等级和使用钢材加固墩底界面以避免墩柱底部在摇摆过程中发生损伤破坏,以墩柱应力分布状态、墩底混凝土损伤以及墩底摇摆界面应力变化作为研究目标,对比不同加固方法对各研究目标的影响,并对摇摆界面加固方式提出具体建议。(4)基于有限元和理论分析对摇摆界面展开研究,介绍了自复位预制装配式桥墩基于性能的目标位移计算方法,推导了不含耗能部件的自复位桥墩界面受压区面积与墩柱转角的关系公式,并探究了基于墩底混凝土损伤的目标位移计算方法。更多还原

【Abstract】 The earthquake disaster has an increasingly serious impact on the urban infrastructure,so the bridge seismic design becomes particularly critical.Because of adopting prefabricated structure,the self-centring prefabricated pier separates the pier column from the bearing platform,and produces the pre-stressed axial compression ratio by connecting the prestressed steel tendon.When the earthquake occurs,the bridge pier begins to swing,and the energy consuming components absorb the seismic energy through deformation,so as to effectively avoid the serious damage of the bridge pier caused by the earthquake.The interface between the column and the bearing platform will cause different degrees of damage to the bottom of the pier due to the continuous swing opening and closing action.Based on the ABAQUS numerical analysis platform,this paper studies the interface of the self-centring prefabricated pier,establishes two kinds of swing interface reinforcement models,deduces the area formula of the compression area of the swing interface,and verifies the superior resistance of the selfcentring prefabricated pier compared with the traditional pier seismic performance.The main contents and innovations of this paper are as follows:(1)This paper introduces the development history of self-centring prefabricated pier,summarizes the research history of domestic and foreign scholars on the structural form of self-centring prefabricated pier,and expounds several different reinforcement methods and development history of swing interface in detail.(2)Based on ABAQUS software,a refined model of self-centring prefabricated pier is established,and the advantages of self-centring prefabricated pier compared with traditional monolithic concrete bridge pier are verified by quasi-static method.(3)According to the damage condition of rocking interface,two kinds of reinforcement methods are put forward,that is,improving the strength grade of concrete at the bottom of pier and using steel to reinforce the interface at the bottom of pier so as to avoid the damage of the bottom of pier in the rocking process.Taking the stress distribution state of pier,the damage of concrete at the bottom of pier and the stress change of rocking interface at the bottom of pier as the research objectives,the different reinforcement methods are compared to each research objective In addition,some concrete suggestions are put forward for the strengthening method of sway interface.(4)Based on the finite element analysis and theoretical analysis,this paper studies the sway interface,introduces the performance-based target displacement calculation method of self-centring prefabricated pier,derives the relationship formula between the area of compression area of self-centring prefabricated pier interface without energy dissipation components and the angle of pier column,and explores the target displacement calculation method based on the damage of concrete at the bottom of pier.更多还原