两种钢管混凝土实体拱桥力学性能的对比分析

进行钢管混凝土实体(哑铃形和单圆管)拱桥的力学性能的有限元分析和对比,并研究拱肋横撑对两种实体拱桥的动力性能和稳定性能的影响。研究表明,对钢管混凝土实体拱桥进行整体设计时,应主要从静力方面考虑拱肋刚度的选取,哑铃形的静力性能优于单圆管;拱肋横撑的数量和形式主要影响结构整体横向刚度,"K"形横撑对面外动力性能的影响要大得多;从稳定性方面考虑,单圆管优于哑铃形。

Comparison and Analysis of Mechanical Properties of Two Types of Concrete-Filled Steel Tube Solid Arch Bridges

The finite element analysis and comparison of mechanical properties of the con-crete-filled steel tube(CFST) solid arch bridges(dumbbell shape and single round tube) aremade and the influences of lateral bracings of arch ribs on the dynamic and stability performance of the two types of the bridges are studied.The results of study show that the selection of arch rib rigidity should be mainly considered from the static aspect of the CFST solid arch bridges when the overall design of the bridges is carried out.The static performance of the dumbbell shape arch bridge as mentioned is superior to that of the single round tube arch bridge.The numbers and types of the lateral bracings of arch ribs mainly have influences on the global transverse rigidity of the bridges and the influences of K-shape lateral bracings on the out-of-plane dynamic performance of the bridges are much greater.In view of the stability performance,the single round tube bridge is better than the dumbbell shape bridge.