三角形挂篮和菱形挂篮有限元对比分析

发布时间：2018-10-17 13:50

【摘要】：随着上跨既有线施工的新建铁路项目的增多,挂篮悬臂施工方法工程经验和理论验算变得十分重要,为同类工程提供参考。结合京沈客专下桃花吐连续梁桥和铁营子连续梁桥的悬臂浇筑工法,基于Midas Civil软件平台,采用数值分析方法对三角形挂篮和菱形挂篮进行有限元计算,对比分析了两种挂篮的刚度、强度和整体稳定性。研究结果表明:模型理论变形值与预压试验变形值十分接近,建模方法较为准确;三角形挂篮的整体刚度优于菱形挂篮,施工荷载下变形较小;菱形挂篮的一阶屈曲稳定系数约为三角形挂篮的2倍,菱形挂篮的稳定性优于三角形挂篮;就桁架和横梁的受力而言,菱形挂篮优于三角形挂篮。
[Abstract]:With the increasing number of new railway projects in the upper span existing railway construction, the engineering experience and theoretical checking calculation of the cantilever construction method become very important, which provides reference for the similar projects. Combined with the cantilever pouring method of Taohuatou continuous beam bridge and Tiesingzi continuous girder bridge, based on the software platform of Midas Civil, the finite element calculation of triangle hanging basket and diamond hanging basket was carried out by using numerical analysis method. The stiffness, strength and overall stability of the two baskets are compared and analyzed. The results show that the theoretical deformation value of the model is very close to the deformation value of preloading test, and the modeling method is more accurate, the integral stiffness of the triangle hanging basket is better than that of the diamond hanging basket, and the deformation is small under the construction load. The stability coefficient of the first order buckling of the diamond hanging basket is about 2 times that of the triangle hanging basket, the stability of the diamond hanging basket is better than that of the triangular hanging basket, and the diamond hanging basket is superior to the triangular hanging basket in terms of the stress of truss and beam.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金项目(51378504)
【分类号】：U445.4

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