温室边柱侧向偏心支撑下的平面外稳定  

Out of plane stability of greenhouse side columns with eccentrically lateral braces

作　　者：齐飞[1] 童根树[2] 

机构地区：[1]农业部规划设计研究院,北京100125 [2]浙江大学建筑工程学院,杭州310058

出　　处：《农业工程学报》2009年第12期245-249,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划重点项目(2006BAD28B07):"现代高效设施农业工程技术研究与示范"

摘　　要：生产性温室通常采用矩形钢管作为立柱,在受力最不利的边柱外侧连接规格更小的钢管作为墙檩。实践中,该墙檩对提高边柱的侧向稳定起到了一定作用,但却缺乏必要的设计理论支持。该文分析了这种小钢管对矩形钢管立柱的侧向支撑作用,分析表明,虽然这种小钢管相对立柱的形心有偏心,但是仍然能够对立柱提供有效的侧向支撑,可以减小立柱的平面外计算长度。按照这个结论,立柱在进行稳定性验算时,平面外的计算长度可以取侧向支撑点之间的距离,从而在保证边柱强度和稳定性、减少边柱用材的基础上,提高边柱计算的科学性。Rectangular box section is widely used as columns in agricultural Greenhouse.Smaller tubes are attached on the outside of the most dangerous side columns to serve as wall purlin.These horizontal smaller tubes provide lateral braces to side columns in practice,but this effect is lacking of theoretical supporting.The paper carried out an analysis of the efficiency of the tube in providing the lateral support.Analysis revealed that,though the smaller tubes are eccentric to the centroid of the column,the lateral braces to the column could still be effective.The out of plane effective length could be decreased accordingly.According to this conclusion,the out of plane effective length could take the distance between the lateral braces when checking the stability of the column.In this way,the checking calculation of the side column could be more scientific and reasonable on the bases of less material application and proper strength and stability of the side column.

关 键 词：温室 稳定性 钢管 支撑 边柱 

分 类 号：S625[农业科学—园艺学]