预应力混凝土斜箱梁桥多重耦合的静动力分析模型及其验证

项目名称： 预应力混凝土斜箱梁桥多重耦合的静动力分析模型及其验证

项目编号： No.51278072

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 夏桂云

作者单位： 长沙理工大学

项目金额： 76万元

中文摘要： 寻找斜箱梁桥剪力滞纵向位移函数的合理形式；考虑剪力滞、剪切变形影响，建立预应力混凝土斜箱梁桥的弯曲- - -扭转多重耦合静动力分析模型；考虑剪切变形影响，建立畸变的静动力分析模型；利用《弹性力学》方法和数值方法，分析斜箱梁桥斜置横隔板自身平面内的抗畸变刚度和出平面的抗弯曲刚度，研究斜置横隔板作为斜箱梁桥约束扭转和畸变问题边界条件的合理简化形式；导出斜箱梁桥关于振动频率的弯曲- - -扭转振动的超越方程和解析方法，解决斜箱梁桥汽车冲击系数计算时的基频参数确定问题；开展畸变振动引起斜箱梁桥"蠕爬"现象的机理研究；探讨斜箱梁桥中预应力对剪力滞的影响。在上述研究的基础上，开发斜箱梁桥多重耦合分析程序，利用模型试验和数值方法，对提出的理论进行验证。项目成果将有助于斜箱梁桥多因素、多重耦合分析理论的形成和发展，揭示畸变振动导致斜箱梁桥"蠕爬现象"的致病机理。

中文关键词： 斜箱梁桥；多重耦合；弯曲－剪切－扭转；分析模型；校核

英文摘要： Look for the appropriate longitudinal displacement function of shear lag for skewed box girder. Considering the shear lag and shear deformation effects, establish the static and dynamic multi-coupling models of flexure-torsion analysis for prestessed concrete box girder bridges. Considering the shear deformation effect, put forward the static and dynamic models of distortion analysis. Using the elastic mechanics method and numerical method, analyze the anti-distortion stiffnes in its own plane and anti-flexture stiffness in its out plane for skewed diaphrams, study the rational simplification of skewed diaphrams as the boundary conditions of restrainted torsion and distortion. Derive the transcendent equation about the vibrating frequency for the flexure-torsion vibration of skewed box girder bridge and the analytical method of vibrating frequencies to solve the determination of fundamental frequency for vehicle impact coefficient calculation. Analyze the mechanism of the creeping crawl phenomenon for skewed box girder bridge by using the distorting vibration. Discuss the influence of prestress on the shear lag of skewed box girder bridge. Based on the above studies, develop the computing program for multi-coupling analysis of skewed box grider bridge, verificate the suggested theories by using model tests and n

英文关键词： skewed box girder；multi couple；bending-shear deformation-torsion；analytical model；check