小半径曲线梁桥抗倾覆性能研究

发布时间：2018-02-05 05:36

本文关键词： 桥梁工程小半径曲线梁桥抗倾覆验算公式影响因素　出处：《公路》2014年10期 　论文类型：期刊论文

【摘要】：依据曲线梁桥弯扭耦合的受力特点,通过力矩平衡原理与几何关系推导出了其抗倾覆稳定性系数计算公式,并提出以该公式为依据进行抗倾覆验算。以某匝道桥梁为例,利用梁格法建立空间有限元模型进行分析计算,根据奇偶跨数、边中跨比、桥梁纵坡、支座间距、单双支座等影响因素对小半径曲线梁桥抗倾覆性能进行了研究。分析结果表明:以该公式为依据进行抗倾覆验算是简便、可靠的,具有一定的工程应用价值。通过设置偶数跨、全桥抗扭支座,增加支座间距可以增加小半径曲线梁桥的抗倾覆性能。对于普通三跨连续曲梁,可以按照弯矩求出其合理跨径比。
[Abstract]:According to the bending and torsional coupling force characteristics of curved girder bridge, the formula for calculating the anti-overturning stability coefficient is derived through the principle of moment balance and the geometric relation. Taking the bridge of a ramp as an example, the spatial finite element model is established to analyze and calculate it, according to the number of odd and even span, the ratio of side to middle span, the longitudinal slope of the bridge and the distance between supports. The anti-overturning performance of small radius curved girder bridge is studied by single and double bearing and other influencing factors. The analysis results show that it is simple and reliable to carry out the anti-overturning checking calculation based on the formula. It has certain engineering application value. By setting even span, the whole bridge anti-torsion support, increasing the support spacing can increase the anti-capsizing performance of the small radius curved beam bridge. For the ordinary three-span continuous curved beam. The reasonable span ratio can be calculated according to the bending moment.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;北京国道通公路设计研究院股份有限公司;
【分类号】：U441
【正文快照】： 2013-11-21小半径曲线梁桥在高速公路互通匝道、城市道路多层立交枢纽等结构中应用越来越广泛。曲线梁桥在荷载作用下产生扭矩[1],在桥长不变的情况下,曲率半径减少,所对应的圆心角增大,“弯-扭耦合”效应更加突出,而梁体扭转将致使支座脱空甚至是桥梁倾覆[2],桥梁的倾覆事故

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