千米跨度公铁两用钢桁梁斜拉桥几何非线性研究

发布时间：2018-03-15 00:14

本文选题：斜拉桥　切入点：公路铁路两用桥　出处：《桥梁建设》2014年05期 　论文类型：期刊论文

【摘要】：为研究非线性因素对超大跨度公铁两用斜拉桥主要构件变形和受力的影响程度,采用5种分析状态,对一座跨度超过千米的公铁两用钢桁梁斜拉桥进行成桥状态下的活载非线性计算分析。建立全桥平面杆系模型,计算各控制量在最不利活载作用下的极值及非线性影响系数。结果表明:对超大跨度公铁两用斜拉桥而言,斜拉索的垂度效应仍然是几何非线性影响的主要因素,梁-柱效应和大位移效应相对较弱;目前桥梁设计的通常方法是考虑修正斜拉索弹性模量进行线性计算,并在此基础上活载考虑10%的非线性放大系数,该方法现实、合理而且稍偏安全。
[Abstract]:In order to study the influence of nonlinear factors on the deformation and stress of the main components of large-span cable-stayed bridge, five kinds of analytical states are adopted. In this paper, a steel truss girder cable-stayed bridge with a span of more than one kilometer is calculated and analyzed under the condition of completion of the bridge, and the plane bar system model of the whole bridge is established. The maximum value and nonlinear influence coefficient of each control quantity under the most unfavorable live load are calculated. The results show that the sag effect of the stay cable is still the main factor of geometric nonlinearity for the large-span double-purpose railway cable-stayed bridge. The beam-column effect and the large displacement effect are relatively weak. At present, the usual method for bridge design is to calculate the elastic modulus of the cable with a modified linear method, and on the basis of this, the nonlinear magnification factor of 10% is considered under live load. Reasonable and slightly safe.
【作者单位】：中铁大桥勘测设计院集团有限公司;
【分类号】：U448.27

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