竹皮轴压箱形构件整体稳定性能试验研究

Experimental study on the overall stability of bamboo-skin axial compression box member

基于114个竹皮箱形截面柱进行了轴心受压试验,研究了0.35 mm与0.5 mm两种厚度规格竹皮制作的等边箱形截面柱在不同宽厚比下的整体稳定性能。基于试验结果,分析了竹皮箱形截面柱的失稳破坏形态和整体稳定系数。试验结果表明,箱形截面构件在受荷时同时存在局部失稳与整体弯曲失稳,其中,长细比小于临界长细比的构件在受压时以局部失稳为主,长细比大于临界长细比的构件以整体失稳为主。通过对试验数据分析拟合,计算了两种规格竹皮各3种宽厚比箱形截面构件的临界长细比值,提出了竹皮轴压箱形构件柱子曲线与承载力设计方法,为学生在结构设计竞赛中进行构件截面设计提供科学的理论依据和计算公式。

Axial compression test is carried out based on 114 bamboo skin box-section columns,and the overall stability performance of equilateral box-section columns made of bamboo skins with 0.35mm and 0.5mm thickness specifications under different width-to-thickness ratios is studied.Based on the test results,the instability failure form and the overall stability coefficient of the bamboo skin box-section column are analyzed.The test results show that when the box-section member is loaded,there are both local instability and overall bending instability.Among the members with a slenderness ratio less than the critical slenderness ratio,local instability is the main component under compression,and overall instability is dominant in the members with a slenderness ratio greater than critical slenderness ratio.By analyzing and fitting the test data,the critical slenderness ratios of the box sections with three width and thickness ratios of two types of bamboo skins are calculated,and the design method of the column curve and bearing capacity of the box members with axial compression of bamboo skins is proposed,which provides scientific theoretical basis and calculation formula for the section design of members in the structural design competition.