马蹄形断面波形钢腹板支架稳定承载性能研究  

Investigation on Stability Behavior of U-shaped Steel Supporting Structure with Corrugated Webs

作　　者：吴丽丽[1,2] 安丽佩 李佳蔚 孙广强[1,2] 

机构地区：[1]煤炭资源与安全开采国家重点实验室(中国矿业大学),北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《工程科学与技术》2017年第6期55-64,共10页Advanced Engineering Sciences

基　　金：国家自然科学基金资助项目(51278488);煤炭资源与安全开采国家重点实验室开放课题资助项目(SKLCRSM14KFB05)

摘　　要：为了研究波形钢腹板支架结构在围岩压力作用下的平面内稳定性能,设计了马蹄形断面波形钢腹板支架的模型试验,分析了支架的稳定承载力、位移与应变发展规律。试验结果表明:支架的最终破坏形态为整体非对称失稳,支架两侧向外变形产生水平位移,右侧水平位移明显大于左侧水平位移;极限荷载时,仅拱顶翼缘和角部腹板进入了塑性阶段。支架的试验结果与有限元分析结果吻合良好,验证了有限元模型的正确性。在此基础上,对波形钢腹板支架的弹塑性屈曲性能进行了有限元参数分析,表明波形钢腹板支架对初始缺陷并不敏感,而腹板高度、腹板厚度及翼缘厚度是弹塑性稳定承载力的敏感参数,影响较大。长细比较小时,对称失稳和反对称失稳均可能发生;长细比较大时,支架会发展反对称失稳;支架的弹塑性屈曲荷载随长细比的增大而降低。有限元计算结果表明,相同边界条件和荷载情况下,波形钢腹板支架的极限稳定承载力是用钢量相同的矿用工字钢支架的2倍以上。In order to investigate the in-plane stability of steel supporting structure with corrugated webs under the pressure of surrounding rocks,a model experiment was carried but to study the stability behavior,displacement and strain developments of U-shaped steel supporting structure with corrugated webs.The results showed that the ultimate failure mode was global asymmetric buckling,the deformation of the two sides of the sup- port was outward along the radial direction,and the deformation of right side was larger than that of left side.Plastic deformation occurred only in the flange at the crown of the top arc and the web of the comer arc.The finite element model was verified by comparing the experimental results with that of finite element analysis.On this basis,the parametric numeric analysis on elastioplastic buckling behavior of corrugated steel webs was conducted by finite element method.The results showed that the corrugated steel webs were not sensitive to the initial imperfection,while the web height,the web thickness and the flange thickness were sensitive factors to the bearing capacity of elastic-plastic stability.When the slenderness ra- tio is small,the symmetric instability or antisymmetric instability may occur.When the slenderness ratio is large,the support will develop the anti- symmetric instability.With the increase of slenderness ratio,the elasto-plastic buckling coefficient k~ increases.Under the same boundary condi- tions and load conditions,the ultimate stability capacity of the steel support with corrugated webs is more than twice as much as that of the H- shaped steel support for mining with the same weight.

关 键 词：波形腹板 稳定承载力 马蹄形支架 模型试验 长细比 

分 类 号：TU392.4[建筑科学—结构工程] TU317.1