马蹄形断面波形钢腹板支架稳定承载性能研究

发布时间：2018-12-23 11:01

【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。
[Abstract]:In order to study the in-plane stability of corrugated steel web support structure under the influence of surrounding rock pressure, the model test of corrugated steel web support with horseshoe section was designed, and the stable bearing capacity, displacement and strain development of the support were analyzed. The experimental results show that the ultimate failure mode of the support is the overall asymmetric instability, the lateral displacement of both sides of the support is outward, and the horizontal displacement of the right side is obviously larger than the horizontal displacement on the left side. Under ultimate load, only the arch flange and corner web enter the plastic stage. The experimental results of the support are in good agreement with the finite element analysis results, and the validity of the finite element model is verified. On this basis, the elastic-plastic buckling behavior of the corrugated steel web support is analyzed by finite element method. The results show that the corrugated steel web support is not sensitive to the initial defects, but the web height. The thickness of web and flange are sensitive parameters of elastoplastic stability. When the length ratio is small, both symmetric instability and antisymmetric instability may occur; when the length is large, the support will develop anti-symmetric instability; the elastic-plastic buckling load of the support decreases with the increase of the slenderness ratio. The finite element calculation results show that the ultimate stable bearing capacity of the corrugated steel web support is more than twice that of the I-shaped steel bracket with the same amount of steel under the same boundary conditions and loads.
【作者单位】：煤炭资源与安全开采国家重点实验室(中国矿业大学);中国矿业大学(北京)力学与建筑工程学院;
【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)
【分类号】：TD350.4

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