厦门鳌冠特大桥上部结构设计及计算分析

Superstructure Design and Calculation Analysis of Xiamen Aoguan Bridge

厦门鳌冠特大桥采用双层桥面结构设计,上层车行桥采用双箱多室箱梁结构,下层慢行桥采用曲线钢箱梁悬吊结构。文中重点介绍桥梁总体设计及结构设计难点,并详细分析了结构纵梁计算及横梁计算。结果表明,减少吊杆间距、设置纵向及横向“V”形拉压杆可有效改善双层桥面结构的动力特性。在两个箱体之间增设跨间系梁,可显著提高双箱多室箱梁结构的横向抗弯及抗扭刚度;若考虑一定安全储备,双箱多室箱梁的纵向计算可采用双单梁模型计算法,但不适用传统横梁计算法。

Xiamen Aoguan Bridge adopts a double-deck bridge structure design,with the upper deck for vehicles using a double-box multicell box girder,and the lower deck for slow traffic using a curved steel box girder suspension structure.There is a focus on introducing the overall bridge design as well as the difficulties encountered in structural design,and there is a detailed analysis of the calculation of longitudinal beams and cross beams.The results show that the dynamic characteristics of the double-deck bridge structure can be effectively improved by reducing the spacing between suspension rods and installing longitudinal and lateral"V"-shaped tension and compression rods.By adding inter-span beams between the two boxes,the lateral bending and torsional stiffness of the double-box multi-cell box girder structure can be significantly improved.If a certain safety reserve is considered,the longitudinal calculation of the double-box multi-cell box girder can adopt the double single beam model calculation method,but the traditional cross beam calculation method is not applicable.