赤壁长江公路大桥桥塔设计与分析

Bridge Tower Design and Analysis of Chibi Yangtze River Highway Bridge

对赤壁长江公路大桥桥塔塔形及塔高进行分析研究,确定合理的桥塔参数,进一步细化结构尺寸设计,并确定采用环向预应力与钢锚梁组合的斜拉索锚固体系。研究并优化下横梁预应力钢束布置方案,有效解决了由于下塔柱与下横梁组成的框架结构刚度过大导致预应力二次力过大的难题。采用新型的深埋锚具进行预应力张拉,解决了传统锚固方式需大范围截断主筋,影响结构整体受力性能的问题,并降低了施工难度。下塔柱设置横隔板提高了桥塔的抗船撞能力。结果表明,桥塔各构件受力均满足规范要求。

The tower shape and height of the Chibi Yangtze River Highway Bridge tower were analyzed to determine the reasonable bridge tower parameters and further refine the structural size design.The stay cable anchorage system combining circumferential prestress and steel anchor beam was determined.The research and optimization of the layout scheme of the prestressed steel beam of the lower beam effectively solved the problem of excessive secondary prestress due to the excessive stiffness of the frame structure composed of the lower tower column and the lower beam.The new deep-buried anchorage was used for prestressed tension,which solved the problem that the traditional anchorage method needs to cut off the main reinforcement in a large range,affects the overall mechanical performance of the structure,and reduced the construction difficulty.The lower tower column with diaphragm improved the anti-ship collision ability of the bridge tower.The results show that the stress of each component of the bridge tower meets the specification requirements.