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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。
The main bridge of Jiubao Bridge in Hangzhou is a three-span continuous arch beam combined tied-arch bridge with novel structure and complicated space mechanics. Based on the similarity theory, the test model was designed according to the different geometric dimensions and plate thickness, and the model test to simulate the pushing process of real bridge was carried out. In order to understand the mechanical behavior of the bridge during the construction process, Numerical Calculation of Corresponding Working Conditions. The results show that the scale model of the long-span steel arch bridge designed based on the similarity theory can well meet the similar relationship between the real bridge and the model. By analyzing the model test data, it is found that under the different thrust conditions, , Stress concentration will occur in the connecting part of the main longitudinal girder and the stress of the main longitudinal girder web will alternate in positive and negative directions. Simulated wind load has a significant effect on stress at each measuring point, which shows obvious nonlinear effect.