组合桥面系杆拱桥力学与经济性能研究

Mechanical and Economic Performance of Tied-Arch Bridges with Composite Deck

为明确大跨度组合桥面系杆拱桥的力学与经济性能,针对主跨200m的桥梁,进行3种系杆拱桥方案(组合桥面、竖直吊杆;正交异性钢桥面、竖直吊杆;组合桥面、网状吊杆)的试设计研究。采用TDV RM Bridge有限元程序建立3种试设计方案模型,对比3种方案的静力强度和稳定性等力学性能;统计各方案材料用量,引入材料指标,对比3种方案的经济性能。结果表明:对于主跨200m的系杆拱桥,组合桥面与正交异性钢桥面相比更能展现出良好的技术与经济竞争力;采用网状吊杆,可显著提高系杆拱桥的结构刚度、减小拱肋和系梁的活载弯矩、节省材料用量,但应重视吊杆的疲劳问题。

In order to explore the mechanical and economic performance of tied-arch bridges with composite deck,we performed the trial design of three schemes(namely,composite deck and vertical hangers,orthotropic steel deck and vertical hangers,and composite deck and network hangers)of 200 m main span tied-arch bridges.Meanwhile,we adopted the TDV RM Bridge finite element software to establish models of three trial design schemes,and compared the mechanical performances,such as structural static strength and static stability,of three schemes.Moreover,we compared the economic performances of three schemes by counting the total quantities and introducing the material indexes.The results show that the 200 m span tied-arch bridge with composite deck exhibits a better technical and economic competitiveness than that with orthotropic steel deck.The adoption of network hangers can significantly increase the structural stiffness,decrease the live-load moment of arch rib and tied beam,and save the total cost of bridge,whereas,the fatigue properties of the inclined hangers should be paid particular attention to.