波形钢腹板预应力混凝土组合箱梁桥动力特性及地震响应研究

发布时间：2018-01-06 13:39

本文关键词：波形钢腹板预应力混凝土组合箱梁桥动力特性及地震响应研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：波形钢腹板PC组合箱梁桥起源于法国，随后在法国、日本等许多国家得到了广泛的研究和应用。我国对该类型桥的研究起步较晚，但发展很快。目前，国内外学者对波形钢腹板箱梁桥的理论研究主要集中在波形钢腹板结构的抗弯、抗剪、抗扭和稳定等方面，足尺模型试验和有限元数值分析也大都选择结构形式简单的简支梁或等截面连续梁，而对大跨径波形钢腹板PC组合箱梁的研究较少，特别是关于动力特性和地震响应方面的研究更少。本文以一座在建的大跨径波形钢腹板PC组合连续箱梁桥为背景，采用midas Civil建立空间动力计算模型，对其动力性能进行研究。主要完成了以下工作：（1）采用杆系模型对全桥进行动力特性分析，提取了前十阶的固有频率和振型；采用有限元程序ANSYS和midas Civil分别建立空间实体—板壳模型和杆系模型，对比分析主梁的动力特性；利用有限元程序ANSYS按照截面静力抗弯刚度等效的原则建立有限元模型，对波形钢腹板和混凝土腹板两种截面形式的动力特性进行对比分析。（2）利用反应谱法和时程分析法分别对结构进行地震响应分析。（3）采用普通钢支座和摩擦摆式减隔震支座两种方案进行非线性时程分析，对比分析其动力特性和时程分析计算结果。通过分析双向地震作用下和考虑竖向地震作用下减隔震支座滞回曲线的变化，来研究双向地震耦合作用和竖向地震作用对摩擦摆式减隔震支座地震反应和受力性能的影响。（4）本文在最后对国内外一些主要抗震国家和地区的减隔震设计规范进行简要的概述和比较，以更全面的了解桥梁减隔震设计。
[Abstract]:Web PC composite box girder bridge with corrugated steel originated in France, then in France, Japan and many other countries have been widely studied and applied. Research on this type of bridge in China started late, but the development is very fast. At present, the theory research of box girder bridge with corrugated steel webs of domestic and foreign scholars mainly concentrated in waveform the bending structure of steel webs shear, torsion and stability etc., the full-scale model test and finite element analysis are also mostly structure simple beam or continuous beam, and the large span of corrugated steel webs of the PC composite box girder is less studied, especially on the dynamic characteristics and seismic response of less.
In this paper, a PC based continuous box girder bridge with corrugated steel webs under construction is built as the background. The Midas Civil is used to establish the spatial dynamic calculation model, and its dynamic performance is studied.
(1) using truss model analysis of dynamic characteristics of the whole bridge was extracted, the first ten order natural frequency and vibration mode are established; spatial entity - shell model and frame model using the finite element program ANSYS and Midas Civil, comparative analysis of the dynamic characteristics of the main girder; using the finite element program ANSYS in accordance with the principle of anti static section the equivalent bending stiffness of the finite element model is established, analyzed the dynamic characteristics of corrugated steel webs and concrete web two section forms.
(2) the response spectrum method and time history analysis method are used to analyze the seismic response of the structure respectively.
(3) the nonlinear ordinary steel bearings and friction pendulum isolation bearing two schemes of time history analysis, comparative analysis of calculation results of the dynamic characteristics and process. Through the analysis of bidirectional earthquake action and considering vertical seismic isolation bearing change hysteresis curve, to study the influence of bidirectional coupling and vertical earthquake the earthquake on the friction pendulum bearings reduce seismic response of isolation and stress performance.
(4) in the end, a brief overview and comparison of seismic design codes for some main seismic aseismic countries and regions at home and abroad is made, in order to have a better understanding of bridge seismic isolation design.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.35;U448.213

【参考文献】