矮塔斜拉桥索梁锚固区受力性能研究

Research on Mechanical Performance of Cable-Girder Anchorage Zone of Extradosed Cable-Stayed Bridge

矮塔斜拉桥索梁锚固区受力复杂且关键,本文基于某矮塔斜拉桥工程实例,采用ABAQUS有限元分析软件,建立了精细化索梁锚固区实体有限元模型,分析在最不利荷载工况下该区域的受力状态。结果表明:锚垫板下混凝土表面、横隔板与顶板交界处以及拉索孔道内部均存在范围大小不一的主拉应力超标区域,其中横隔板与顶板交界处拉应力问题最为突出,设计时应充分考虑主拉应力大小及方向,合理配筋以确保结构的抗裂性能。

The force in the cable-girder anchorage zone of an extradosed cable-stayed bridge is complex and critical. Based on an engineering example of n extradosed cable-stayed bridge, this paper uses the ABAQUS finite element analysis software to establish a refined finite element model of the cable-girder anchorage zone. The force state of the area under the most unfavorable load conditions is analyzed. The results show that: the concrete surface under the anchor pad, the junction between the diaphragm and the top plate, and the inside of the cable channel all have areas with different ranges of main tensile stress exceeding the standard. Among them, the tensile stress problem at the junction of the diaphragm and the roof is the most prominent. The magnitude and direction of the main tensile stress should be fully considered, reasonable reinforcement should be designed to ensure the crack resistance of the structure.