榫卯接缝节段拼装桥墩抗震性能数值分析

发布时间：2018-06-01 06:23

本文选题：预制节段拼装桥墩 + 榫卯接缝　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：预制节段拼装桥墩是将墩身沿纵向分为若干预制墩柱节段，再通过后张预应力筋将各个节段挤压整合的一种新型构件，具有施工速度快、自复位性能强和综合经济效益高等优点。然而，现有节段拼装桥墩均为平面接缝形式，因而难以消除节段剪切错动所带来的安全隐患；而且由于预制节段拼装桥墩在分析时同时涉及材料非线性、接触非线性和几何非线性，数值模拟难度较大，故目前对其数值研究还十分欠缺。鉴于此，本文提出“榫卯接缝节段拼装桥墩”的概念，通过改变拼接缝的构造形式来避免节段之间相对滑动，并对该类桥墩的抗震性能进行数值研究。主要研究工作如下：（1）对现有平面接缝节段拼装桥墩的构造形式、受力及变形特点进行总结和分析，指出当前研究中存在的主要问题，继而提出“榫卯接缝节段拼装桥墩”的概念并阐述其构造设计思路；（2）确定基于ABAQUS平台进行钢筋混凝土构件有限元数值模拟的建模方法，并结合现浇钢筋混凝土墩柱试验进行验证；在此基础上增加对接触非线性及无粘结预应力筋的模拟，建立无粘结预应力节段拼装桥墩有限元模型，，并结合试验验证了该建模方法的正确性；（3）利用上述验证过的有限元建模方法，对所提出的榫卯接缝节段拼装桥墩进行静力推覆分析，以构件变形特点、损伤分布、峰值承载力、延性、刚度为指标，研究了耗能钢筋配筋率、墩底混凝土约束情况及初始预应力值对榫卯接缝节段拼装桥墩抗震性能的影响规律；（4）分析了榫卯接缝节段拼装桥墩自复位能力与耗能能力的关系以及影响其自复位能力的主要因素，并通过对桥墩进行加载-卸载数值模拟，研究了初始预应力值和耗能钢筋配筋率对其自复位能力的影响规律，并结合前述静力推覆分析研究结论确定了此二者的合理取值范围，为后续试验研究提供参考。
[Abstract]:Precast segmental assembly pier is a new type of member which divides the pier body into several precast pier column segments along the longitudinal direction and compresses each segment through post-tensioned prestressed tendons, which has a fast construction speed. The self-reset performance is strong and the comprehensive economic benefit is high. However, the existing segmental assembly piers are plane jointed, so it is difficult to eliminate the hidden danger of safety caused by segmental shear dislocation, and the material nonlinearity is also involved in the analysis of prefabricated segmental assembly piers. It is difficult to simulate contact nonlinearity and geometric nonlinearity. In view of this, this paper puts forward the concept of "jointing piers with tenon joints", which can avoid the relative sliding between segments by changing the structural form of jointed joints, and makes a numerical study on the seismic behavior of this kind of piers. The main work of the study is as follows: 1) summarizing and analyzing the structural form, stress and deformation characteristics of the existing plane joint segment assembly piers, and pointing out the main problems existing in the current research. Then the paper puts forward the concept of "assembling bridge piers in joint segment of tenon and joint" and expounds its structural design idea. The modeling method of finite element numerical simulation of reinforced concrete members based on ABAQUS platform is determined, which is verified by the test of cast-in-place reinforced concrete pier column, and the simulation of contact nonlinear and unbonded prestressed tendons is added on this basis. The finite element model of unbonded prestressed segmental assembly pier is established, and the correctness of the modeling method is verified by experiments. (3) using the finite element modeling method verified above, the static and force push-over analysis is carried out on the proposed jointed pier, which is based on the characteristics of deformation, damage distribution, peak bearing capacity, ductility, stiffness, etc. The influence of the reinforcement ratio of energy dissipation bar, the concrete constraint at the bottom of the pier and the initial prestress value on the seismic behavior of the jointed piers with tenon and joint is studied. (4) the relationship between the self-reset capacity and energy dissipation capacity of the jointed piers with tenon and joint joints and the main factors affecting their self-reset ability are analyzed, and the load-unloading numerical simulation of the piers is carried out. The influence of initial prestress value and energy dissipation reinforcement ratio on self-reset ability is studied, and the reasonable range of these two values is determined in combination with the above conclusion of static push-over analysis, which provides a reference for further experimental study.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22;U442.55

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