加肋箱型长杆极限承载力实验研究

EXPERIMENTAL STUDY ON ULTIMATE CAPACITY OF BOX STIFFENED BAR UNDER COMPRESSION

为研究加肋箱型空心长杆的力学性能,采用竹皮和竹条制作了147个长度、截面形式和制作方法不同的杆件,测试了承载力和荷质比。结果表明:杆长在250~350 mm杆件破坏载荷介于受压和失稳破坏之间;无论荷质比还是承载力,双层杆件优于单层杆件;在制作杆件时,应对竹皮缺陷、杆件棱角进行补强。本文源自大学生结构设计竞赛中的桥梁结构模型,对培养大学生将力学与实践相结合的创新能力有所助益。

In order to study the mechanical properties of the long hollow box with stiffened bar, this study measured the bearing capacity under different load-mass ratio of 147 test pieces of various length and crosssection, which are made of bamboo skin and strips using distinct methods. The test results show that the failure of the bar with length within 250 ~ 350 mm is between compression failure and instability failure, and the bearing capacity and load-mass ratio for double-layer bars are better than those of single-layer bars. It is necessary to repair/strengthen the defects of bamboo skin and the edges of the bar during the preparation progress. This study is part of a college competition of structural design of bridges, aiming to cultivate students innovation in combining mechanical theory and engineering.