大跨悬索桥锚碇地下连续墙基础不同刚性接头形式对比研究

Comparative Research on Different Rigid Joint Forms of Anchorage Diaphragm Foundation of Long-span Suspension Bridge

地下连续墙是大跨度悬索桥锚碇常用的基础型式,为了保障地下连续墙的整体性,张靖皋长江大桥南航道桥创新性地提出了刚性接头型式。为了对比不同刚性接头构造形式的受力性能,开展了5组接头型式的局部拉伸试验,分析了不同刚性接头形式的破坏模型、承载力、延性以及裂缝宽度。试验结果表明:多道钢筋搭接刚性接头的效果最好,表现出了较好的受力性能与延性,且该构造在实际施工中可行性较高,可以更好地满足刚性接头设计需求,该接头型式具有较好的应用和推广前景。

Diaphragm wall is a common foundation type for anchorage of long-span suspension bridge.In order to ensure the integrity of diaphragm,the rigid joint is innovatively proposed in the South Channel Bridge of Zhang-Jing-gao Yangtze River Bridge.In order to compare the mechanical properties of different rigid joint types,five groups of local tensile experiments are carried out to analyze the failure model,bearing capacity,ductility and crack width of different rigid joints.The experiment results show that the multi-channel steel bar lapping rigid joint is the best,showing good mechanical performance and ductility,and the structure is highly feasible in actual construction,which can better meet the design requirements of rigid joint,thus the joint type has good application and promotion prospects.