【作者】 陈宇；

【导师】 夏招广；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2009， 硕士

【摘要】 混合梁斜拉桥是一种具有发展前景的新型的斜拉桥形式,主梁沿长度方向由两种不同结构组成,主跨采用钢箱梁,边跨采用混凝土梁。本文以一独塔混合梁斜拉桥作为工程背景,利用最小弯曲能量法,按所取控制目标优化索力,合理成桥状态。通过有限元程序MIDAS/CIVIL对实桥进行各种静力荷载工况下的结构内力以及位移分析,同时对影响静力行为的参数进行分析,主要内容包括:主跨边支座处无索区长度对结构内力和位移的影响;主梁刚度对对结构内力和位移的影响;主塔刚度对结构内力和位移的影响;通过比较和分析得出对实际工程有意义的结论。其次从结构动力特性的基本原理入手,介绍了求解动力特性的数值解法,利用ANSYS大型通用有限元程序建立全桥空间有限元模型,准确模拟结构的质量和刚度,对自振特性结果进行了分析。最后将理论计算结果与现场荷载试验测试值进行比较分析,对桥梁结构进行评价。更多还原

【Abstract】 Hybrid girder cable-stayed bridge is a new kind of cable-stayed bridge with pespective future. The girder is composed of two structures along the length direction. The main span is steel girder and the side span is concrete girder.In this dissertation, the thesis based on a hybrid girder cable-stayed bridge with single tower, used rninmum bending energy method which took the minimum stress of girder and tower in the finished dead state as the objective function to decide reasonable finished dead state. Analysis the internal force and displacement in every static load condition of structure, and then, the influence of parameters changs on the internal force and displacement is discussed in detail, which includes the length in the non-cables region closed to the obutment of the main span, the stiffness of the main girder and tower by FEM program MIDAS/CIVIL.The theories of dynamic characteristic and numerical methods are introduced. The three dimension finite element model is built by FEM program ANSYS, simulate the structure’s mass and stiffness accurately, and analysis the nature vibration of the structure. At last, compared with theory results and the test results of the load experiment, makes the appraisal to the bridge performance.更多还原