木龙河斜拉跨越结构的静态力学分析

THE STATIC MECHANICAL ANALYSIS OF PIPELINE CROSSING DIAGONAL CABLE TYPE STRUCTURE IN MULONG RIVER

利用有限元法对木龙河斜拉跨越结构进行了力学分析.结果表明:安装时索具有一定的预应变可以提高结构的强度和刚度,但预应变太大反而降低结构的刚度和强度,预应变存在一个最优值,且最优值与结构的形式和载荷有关;在工作载荷或充水载荷作用下,结构的强度刚刚满足要求;在极限载荷作用下,结构的强度不满足要求;结构中最大应力出现在左塔架顶端连接索处、右塔架顶端连接索处和管桥架中间上缘杆.

The mechanical analysis is carried out for the preliminary design of the pipeline crossing diagonal cable type structure in Mulong River by the finite-element method. The results indicate that the cable with some pre-strain can improve the strength and the stiffness of the structure while it is installed, but if the pre- strain is too large the strength and the stiffness will be declined, so there is art optimum value of pre-strain for the structure, to be influenced by the form of structure and the loads on structure; under the work loads or the water filling loads, the strength of the structure just meets the requirements. Under the ultimate loads, the strength of the structure does not meet the requirements. There are three places where the maximum stress is reached in the structure the left tower top connected with cable, the right tower top connected with cable and the upper limb of the intermediate pipe bridge.