多厢互联预应力混凝土渡槽设计方法

The Design of Multitrough Prestressed Concrete Aqueduct

针对南水北调中线总干渠渡槽流量大、荷载大、槽身过水断面大，普通梁式渡槽难以满足要求的特点，提出了新型矩型截面多厢互联预应力混凝土连续梁式渡槽．这种型式渡槽刚度大、承载能力大、跨越能力大，是一种适用于大流量输水渡槽的经济合理的新型结构。文中介绍了这种渡槽的结构设计方法，包括槽身跨度和横截面尺寸的确定原则；纵向、横向和竖向预应力钢筋及锚固体系的选择；按平面问题和按空间问题分析方法以及槽身结构承载能力极限状态和正常使用极限状态设计要求等内容．分析结果表明，这种渡槽空间受力效应明显，宜采用平面问题与空间问题相结合的分析方法。

In accordance with the characteristics of large discharge, heavy load and huge water section ofSouth-to-North Water Transfer Project aqueducts, a new type mucltitrough-multispan rectangular continuousaqueduct is proposed in this paper. This structure possesses the advantages of high stiffness, heavy duty, longspans and low cost. It is suitable for large discharge aqueduct. Design methods, included the principle of defer-mining span and section, the selection of prestressing tendons and anchorages, the analysis procedure based onthe plane poles system and three-dimensional finite element and the design requirment of the limit state, are in-troducted. The results have shown that this type aqueduct presents the effectiveness of three-dimensional ac-tion and should be designed to integrate plane structure with space structure.