钢箱梁斜拉桥耳板式索梁锚固结构应力分布

Stress distribution in anchorage zone between beam and cable for cable-stayed bridge with steel box girder

为确保钢箱梁斜拉桥耳板式索梁锚固结构布置合理及受力安全,对这类关键构造部位在斜拉索索力作用下的应力大小及其分布规律进行研究.针对杭州湾跨海大桥北航道桥主桥钢箱梁索梁锚固节点,采用室内1∶3缩尺模型试验和空间有限元仿真分析相结合的方法,研究该型式索梁锚固结构传力途径及其各板件应力分布规律,并评价该结构构造的承载性能.实验与理论分析结果表明,这种索梁锚固构造在正常使用荷载作用下各板件应力分布合理、传力明确,在极限荷载下安全可靠.

In order to verify the rationality and security of anchorage zone arrangement between beam and cable for a cable-stayed bridge with steel box girder, the stress state and distribution in anchorage zone of Hangzhou Bay Bridge was studied. The finite element simulation was employed to model the anchorage zone, the stress distribution of some structural members was investigated, and the load-carrying performance of this structure was evaluated. The results of simulation were verified by the reduced scale model test of anchorage zone for Hangzhou Bay Bridge with the scale of 1 ： 3. The theoretical and experimental analyses indicate that the stress distribution and transimission for structural members in anchorage zone are are reasonable and smoothly with, satisfying carrying capacity.