河道中折线形及曲线形迷宫堰的结构受力特点对比分析

Comparative Analysis of Structural Stress Characteristics of Meandering Line and Curved Labyrinth Weirs

迷宫堰作为新型的低水头挡水溢流结构,因其具有构造简单、结构新颖、景观效果好、无上部结构等一系列的特点。以曲线形及折线形两种迷宫堰为研究对象,借助有限元计算就两种迷宫堰挡水情况下的结构受力特点进行计算分析。结果表明:(1)结构应力方面,两种堰的大主应力分布规律基本一致,拉应力均小于混凝土结构的抗拉强度极值,最大值主要分布在直墙与底板接触的左右侧根部位置以及边墙凸点顶部位置,曲线形堰的大主应力极值比折线形堰偏低。(2)结构位移方面,两种堰位移分布规律基本一致,总体位移均在毫米级以内,总位移最大值主要分布在直墙左右侧顶部位置,曲线形堰的总位移比折线形堰略微偏高。

Labyrinth weir,as a new type of low head water retaining and overflow structure,has a series of characteristics such as simple structure,novel structure,good landscape effect and no superstructure.In this paper,the curved and broken line labyrinth weirs are taken as the research objects,and the structural stress characteristics of the two labyrinth weirs are calculated and analyzed with the help of finite element calculation.The results show that:(1)In terms of structural stress,the distribution of large principal stress of the two kinds of weirs is basically the same,and the tensile stress is less than the extreme value of tensile strength of concrete structure.The maximum value is mainly distributed in the root position of the left and right sides of the vertical wall contacting with the bottom plate and the top position of the convex point of the side wall.The extreme value of large principal stress of curved weir is lower than that of broken line weir.(2)In terms of structural displacement,the displacement distribution rules of the two weirs are basically the same,and the total displacement is within millimeter level.The maximum total displacement is mainly distributed at the top of the left and right sides of the straight wall,and the total displacement of the curved weir is slightly higher than that of the broken line weir.