【作者】 孙凌岩；

【导师】 何畏；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 论文首先对波形钢腹板箱梁矮塔斜拉桥国内外发展状况及结构特点进行简要阐述之后,在参照已建波形钢腹板组合箱梁实桥基础上,进行了跨径组合为(78+128+78)m的等截面波形钢腹板矮塔斜拉桥方案设计。采用大型有限元软件Midas Civil建立基于梁单元的全桥组合有限元模型,详细计算分析桥梁各个施工阶段的受力和变形,考虑并分析收缩徐变效应对结构的影响；计算分析运营阶段汽车活载、体系温度荷载、温度梯度荷载、制动力和不均匀沉降各单独工况作用及各种组合工况作用下桥梁的效应；利用子空间迭代法计算分析桥梁的动力特性,分别用反应谱法和时程分析法分析地震作用下的响应,并将其与之等效的PC箱梁矮塔斜拉桥进行对比分析,探讨波形钢腹板矮塔斜拉桥的结构行为。还利用有限元软件Midas FEA建立结构局部板单元模型,重点对波形钢腹板进行详细应力分析,并总结给出了局部弹性剪切屈曲、整体弹性剪切屈曲、合成弹性剪切屈曲和非弹性剪切屈曲模式的计算和分析方法。更多还原

【Abstract】 Firstly, the developing situation at home and abroad and the structure characteristics of extrodosed bridge with Corrugated Steel Webs Girder was described in the thesis. Taking a constructed bridge as reference, a extrodosed bridge with corrugated steel webs with spans of (78+128+78)m had been designed. A combined finite element model involving beam element for the bridge is developed using Midas Civil, a general commercial finite element software. Stresses and deformations of the bridge are analyzed incrementally following every construction stages. According to the results, the time-dependent effects have a significant effect on the structural behaviors both in terms of stress and deformation at operational stage. Static load cases for analysis include live road loads, temperature variations, lateral sway force of train, uneven settlement force and combinations of such loads. The free vibration modes and frequencies of the bridge are computed using the subspace iteration method. Subsequently, comparedwith anequivalent PC box-girder, spectrum analysis and time history dynamic analysis are carried out and the results are compared. The Aim lies in discussing vibration characteristics of the PC box-girder bridge with corrugated steel webs.A finite element model involving plate element for part of the bridge is developed using Midas FEA, a general commercial finite element software,and emphasis on particular stress analysis of corrugated steel webs. Local,global, synthetic elastic shear buckling and unelastic shear buckling analysis and calculation method of corrugated steel webs were proposed.更多还原