特大型高架渡槽托举效率对比研究

Comparative study on lifting efficiency of super-large aqueduct

在强震地区,特大型高架渡槽结构设计的主要困难是其抗震减震性能设计。本文首次提出渡槽槽身托举效率的概念,并且用托举效率来衡量大型渡槽槽身的抗震减震性能,即利用ANSYS软件,在保证过水面积相等、结构应力和挠度大致相同的前提下,比较了不同材料、不同截面形式、不同跨度下的渡槽槽身托举效率。有限元分析结果表明40 m跨预应力混凝土两槽独立式U型渡槽为最优方案。

In meizoseismal areas, the main difficuhy for the structural design of the super-large aqueduct is the seismic design of its seismic reduction performance. The concept of the lifting efficiency of aqueduct is initially proposed herein, furthermore, the seismic performance of the body of large aqueduct is judged with the lifting efficiency; i.e. under the premise of that the guaran- teed discharge areas are same, while the structural stress and deflection are roughly same, the lifting efficiencies of the aqueduct body under the conditions of various materials, various section types and various spans are compared with ANSYS software. The result from the finite element analysis shows that the optimal scheme is the independent pre-stressed concrete dual-trough and U- shaped aqueduct with the span of 40 m.