九堡大桥主桥顶推施工模型试验研究

发布时间：2018-01-04 04:42

本文关键词：九堡大桥主桥顶推施工模型试验研究　出处：《中外公路》2017年05期 　论文类型：期刊论文

【摘要】：杭州九堡大桥主桥为三跨连续拱梁组合系杆拱桥,结构形式新颖,空间力学特性复杂。大桥采用整体顶推施工方法,为了解其顶推施工过程中的力学行为,基于相似理论,按照几何尺寸与板厚不同比例设计了试验模型,并开展了模拟实桥顶推过程的模型试验和对应工况的数值计算研究。结果表明:基于相似理论设计的大跨度钢拱桥缩尺模型能较好地满足实桥与模型之间的相似关系;通过分析模型试验数据发现,在不同的顶推工况临时撑杆与主拱、主纵梁连接部位会出现应力集中现象且主纵梁腹板应力存在正负交替情况;模拟风荷载对各测点应力影响显著,体现出明显的非线性效应。
[Abstract]:The main bridge of Hangzhou Jiubao Bridge is a three-span continuous arch girder combined tied arch bridge with novel structure and complicated spatial mechanical properties. The bridge adopts the integral pushing construction method to understand the mechanical behavior in the process of its jacking construction. Based on the similarity theory, the experimental model is designed according to the different ratio of geometric size and plate thickness. The model test and the numerical calculation of the corresponding working conditions are carried out to simulate the real bridge jacking process. The results show that:. The large span steel arch bridge scale model based on similarity theory can satisfy the similarity between the real bridge and the model. Through the analysis of the model test data, it is found that the stress concentration will occur in the connecting part of the main longitudinal beam and the web stress of the main longitudinal beam will alternate between the temporary bracing and the main arch under different jacking conditions. The simulated wind load has a significant effect on the stress of each measuring point, and shows obvious nonlinear effect.
【作者单位】：武汉理工大学交通学院;
【基金】：国家自然科学基金资助项目(编号:51409202) 吉林省交通厅科研项目(编号:2012-1-5)
【分类号】：U445.4
【正文快照】： 伴随桥梁工程中高性能材料研发及设计理念不断创新,桥梁的空间形式与受力特性日趋复杂,虽然基于三维非线性有限元精细化数值建模方法不断发展,但模型试验仍是解决桥梁建设中新型结构设计理论及施工工艺的主要手段。中国许多大桥开展了结构模型试验及顶推施工研究,分析大桥的具

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