旧桥拓宽加固中荷载横向分布系数的变化规律

发布时间：2018-01-16 20:22

本文关键词：旧桥拓宽加固中荷载横向分布系数的变化规律　出处：《中外公路》2017年04期 　论文类型：期刊论文

【摘要】：为研究荷载横向分布系数在拓宽扩建后的公路桥梁中的变化情况,提出了纵横梁拓宽加固法。通过建立旧桥拓宽加固的模型,研究加固横梁的设置位置、数量、刚度;加宽主梁、旧桥的刚度以及主梁连接方式不同时,各主梁横向分布系数的变化规律。结果表明:采用纵横梁加固法拓宽加固时,可明显改善旧桥特别是边梁的受力,建议改造后的桥梁支点处应做好加强措施;改变横梁的数量、位置和尺寸对各主梁的荷载横向系数影响较小;加宽主梁与既有主梁采用铰接形式,其值较刚接时大且各主梁波动较小;主梁与加固横梁分别采用铰接和刚接时,各主梁的荷载横向分布系数差别较小,整体呈V形分布。该文的研究成果可为旧桥拓宽改造设计提供依据。
[Abstract]:In order to study the variation of load transverse distribution coefficient in highway bridges after widening and expansion, the method of widening and strengthening longitudinal and transverse beams is put forward. By establishing the model of widening and strengthening of old bridges, the location and quantity of strengthened beams are studied. Stiffness; When widening the main beam, the stiffness of the old bridge and the connection mode of the main beam, the variation law of the transverse distribution coefficient of the main beam is different. The results show that the longitudinal and transverse beam reinforcement method is used to widen the reinforcement. The stress of the old bridge, especially the side beam, can be improved obviously. It is suggested that measures should be taken to strengthen the fulcrum of the modified bridge. Changing the number, position and size of the beams has little effect on the transverse coefficients of the main beams. The widening of the main beam and the existing main beam are hinged, the value of which is larger than that of the rigid connection, and the fluctuation of each main beam is smaller. When the main beam and the strengthened cross beam are hinged and rigidly joined, the difference of the transverse load distribution coefficient of each main beam is small and the whole is V-shaped distribution. The research results in this paper can provide the basis for the design of widening and rebuilding of the old bridge.
【作者单位】：长沙学院土木工程学院;浙江省交通运输科学研究院;长沙市规划设计院有限责任公司;
【基金】：湖南省教育厅科学研究项目(编号:15C0125) 浙江省交通运输厅科技项目(编号:2017016) 浙江省科学技术厅省属科研院所扶持专项项目(编号:2017F30049)
【分类号】：U445.72
【正文快照】： 1前言桥梁是一种人工构造物,有着建造、使用和老化的阶段。中国的现有服役桥梁中大多在20世纪50~80年代建造,桥龄已达30~60年,老化严重、破损不堪。再加上交通量的增大,载重量的增加,对装配式公路桥梁造成很大的损伤,甚至破坏。中国大规模的桥梁建设高峰期已过,现在逐步进入一

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