弯梁桥倾覆相关问题研究

发布时间：2019-02-16 05:28

【摘要】：受平面曲率的影响,弯梁桥外弧侧弧长大于内弧侧弧长,其体积重心偏离截面的形心轴,且受弯扭耦合作用影响,扭转效应明显,设计中对其考虑不周会影响结构安全。近年来,弯梁桥施工阶段的整体倾覆事故频发,这表明设计存在不足,一方面对弯梁桥本身特点认识不足,另一方面对施工临时荷载对弯梁桥倾覆的影响考虑不够。论文以弯梁桥为研究对象,通过对不同计算模型计算的弯梁桥在自重作用下的支座反力的比较,分析其差异产生的原因,得知弯梁桥支座反力计算的准确计算模型,包括空间网格模型和空间实体模型；以此为指导,采用空间实体模型分析弯梁桥在不同浇筑顺序的护栏荷载、不同停靠位置的施工车辆荷载等施工阶段临时荷载作用下的支座反力变化规律,研究这些荷载对弯梁桥施工阶段倾覆稳定性的影响,提出合理的临时荷载添加方案,为施工组织提供参考；在此基础上,对比单联不同跨数的弯梁桥在类似荷载以及成桥荷载作用下的倾覆稳定性,比较不同分联方式的弯梁桥之间的稳定性,为设计选择合适的分联方式提供理论参考。
[Abstract]:Due to the influence of plane curvature, the external arc length of curved beam bridge is longer than that of internal arc side, and its volume center of gravity deviates from the center of the axis of section, and is influenced by the coupling of bending and torsion, and the torsional effect is obvious, and the safety of the structure will be affected by not considering the circumference in the design. In recent years, there are frequent overturning accidents in the construction stage of curved girder bridge, which indicates that the design is insufficient. On the one hand, the characteristics of the curved beam bridge is not well understood, and on the other hand, the influence of temporary construction load on the capsizing of curved beam bridge is not considered enough. This paper takes the curved beam bridge as the research object, through the comparison of the support reaction force of the curved beam bridge under the action of deadweight, analyzes the reason of the difference, and finds out the accurate calculation model of the bending beam bridge bearing reaction force calculation. It includes spatial grid model and spatial entity model. Under the guidance of this method, the spatial solid model is used to analyze the change of support reaction force of curved girder bridge under temporary load in construction stage, such as guardrail load in different pouring sequence, construction vehicle load in different parking position, and so on. This paper studies the influence of these loads on the overturning stability of curved girder bridge in construction stage, and puts forward a reasonable temporary load adding scheme, which provides a reference for the construction organization. On this basis, the overturning stability of curved beam bridges with different single span numbers under similar loads and bridge loads is compared, and the stability of curved beam bridges with different splicing modes is compared, which provides a theoretical reference for the design and selection of suitable splicing modes.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442

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