非均布荷载下扣件式脚手架的随机缺陷稳定分析

发布时间：2018-05-26 06:09

本文选题：扣件式钢管脚手架 + 随机缺陷　；参考：《西安建筑科技大学学报(自然科学版)》2016年05期

【摘要】：针对有缺陷的扣件式钢管脚手架,研究了其在非均布荷载下的全过程受力性能,提出了一种改进随机缺陷法,系统地分析了架体在不同荷载分布和各种缺陷随机耦合情况下,其相应失稳形态及极限荷载的随机分布规律,并进行了相关试验.发现架体立杆、水平杆及斜撑的应力均为阶梯状分布,架体在非均布荷载作用下呈现出立杆波浪形失稳形态,并且其极限荷载符合正态分布规律.研究表明架体中的水平杆和斜撑均参与架体受力,内力通过这两种杆件的传递在架体立杆中实现再分配,从而使得立杆应力从上到下逐渐减小,并使每根立杆均参与架体的受力.此外,由规范计算得到的架体稳定承载力具有很高概率可靠性,但是并不是架体稳定承载力的下限,在某些情况下,可能会存在安全隐患.
[Abstract]:In this paper, the mechanical behavior of steel tube scaffolding with fastener is studied, and an improved random defect method is proposed to analyze the load distribution and the random coupling of various defects. The random distribution law of the corresponding instability and ultimate load is obtained, and the related tests are carried out. It is found that the stress of vertical bar, horizontal bar and diagonal brace are all ladder-like distribution, and the frame shows wave instability under non-uniform load, and its ultimate load conforms to the normal distribution rule. The research shows that the horizontal bar and the inclined brace in the frame take part in the stress of the frame, and the internal force is redistributed through the transfer of the two kinds of members in the frame shaft, so that the stress of the vertical bar decreases gradually from top to bottom. And make each pole participate in the force of the frame body. In addition, the stability bearing capacity of the frame calculated by the code has a high probability reliability, but it is not the lower limit of the stability bearing capacity of the frame. In some cases, there may be a hidden safety hazard.
【作者单位】：安徽建筑大学土木工程学院;
【基金】：安徽高校自然科学研究项目(KJ2015A046) 安徽省自然科学基金项目(1408085QE96) 国家自然科学基金项目(11472005)
【分类号】：TU731.2

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