单索面钢箱梁斜拉桥主梁剪力滞效应研究

发布时间：2018-04-01 19:39

本文选题：单索面斜拉桥　切入点：钢箱梁　出处：《长安大学》2014年硕士论文

【摘要】：单索面钢箱梁斜拉桥作为斜拉桥中较为特殊的一类，具有传力明快、造型美观等特点。随着国内外斜拉桥技术的不断发展，该类桥型的数目也不断增多。但受到其索面布置特点的影响，单索面钢箱梁斜拉桥主梁的剪力滞效应较为突出。本文就国内外对箱形薄壁梁剪力滞效应的理论及试验研究现状做了详细介绍，随后针对单索面钢箱梁斜拉桥的构造及受力特点，对现有的解析计算法和数值分析法作了比较和讨论，，并以宁波市大榭第二大桥为例，通过实桥测试数据与有限元仿真计算结果相对比的方法对其主梁剪力滞效应进行分析。主要结论如下：单索面钢箱梁斜拉桥主梁的剪力滞效应较为复杂，通过对能量变分法和比拟杆法求解过程的详细对比，认为比拟杆法的计算过程更为简便。同时对三杆比拟法、能量变分法及有限元法的计算结果进行校核，证明解析法的求解精度能够满足工程需要。通过闭口加劲肋构造尺寸的参数分析，表明闭口加劲肋对翼缘板的剪切性能及其剪力滞翘曲位移分布会造成一定程度的影响。当闭口加劲肋厚度及高度增大时或布置间距减小时，翼缘板剪力滞效应减弱。钢箱梁截面有效分布宽度会受到斜拉索集中力的影响。通过对大榭第二大桥主梁应力的有限元分析，可知在索力的作用下主梁翼缘板有效分布宽度最多会缩小22%，在解析法计算时应考虑该影响。本文最后通过对大榭第二大桥施工全过程所进行的实桥主梁应力测试，选取主跨跨中最大悬臂施工阶段、桥面铺装及附属设施的安装、成桥阶段加载试验的实测应力数据进行分析，并按照各个工况所对应的结构体系、边界和荷载条件进行有限元分析。在对实测应力值和理论计算值进行对比后，验证了板壳-杆系混合有限元模型仿真分析的结果是准确的。
[Abstract]:As a special kind of cable-stayed bridge, single cable plane steel box girder cable-stayed bridge has the characteristics of quick transmission, beautiful shape, etc. With the development of cable-stayed bridge technology at home and abroad, The number of this type of bridge is also increasing, but the shear lag effect of the main girder of single cable deck steel box girder cable-stayed bridge is more prominent due to the influence of the cable surface arrangement. This paper introduces in detail the theory and experimental study of shear lag effect of box thin-walled beam at home and abroad, and then aims at the structural and mechanical characteristics of single cable plane steel box girder cable-stayed bridge. The existing analytical calculation method and numerical analysis method are compared and discussed, and taking the second Bridge of Daxie in Ningbo as an example, The shear lag effect of the main beam is analyzed by comparing the real bridge test data with the finite element simulation results. The main conclusions are as follows:. The shear lag effect of the main girder of steel box girder cable-stayed bridge with single cable plane is more complicated. Through the detailed comparison between the energy variation method and the analogy bar method, it is considered that the calculation process of the analogy bar method is more convenient. The results of energy variational method and finite element method are verified, and it is proved that the accuracy of the analytical method can meet the needs of engineering. Through the parameter analysis of the structural dimension of the closed stiffener, It is shown that the shear behavior and shear lag displacement distribution of flange plate are influenced to some extent by closed stiffening ribbed rib, and the shear lag effect of flange plate decreases when the thickness and height of stiffening rib increase or the spacing decreases. The effective distribution width of section of steel box girder is affected by the concentrated force of stay cable. The stress of the main girder of Daxie second Bridge is analyzed by finite element method. It can be seen that the effective distribution width of the flange plate of the main beam can be reduced by 22% under the action of cable force, which should be taken into account in the analytical calculation. Finally, through the stress test of the main girder of Daxie No.2 Bridge during the whole construction process, the maximum cantilever construction stage of the main span is selected, and the bridge deck paving and the installation of ancillary facilities are selected. The measured stress data of the bridge loading test are analyzed, and the finite element analysis is carried out according to the structural system, boundary and load conditions corresponding to each working condition. After the comparison between the measured stress values and the theoretical calculated values, The simulation results of the hybrid finite element model of plate, shell and bar system are proved to be accurate.
【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;U448.27

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