基于ANSYS的U型钢反拱梁承载性能及稳定性分析  

ANSYS-based bearing performance & stability analysis of U-shaped steel antiarch beam

作　　者：郑西贵[1] 刘娜[1] 冯晓巍[1] 张农[1] 付世雄 花锦波[1] 

机构地区：[1]中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2015年第3期459-464,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金青年基金项目(51104152);长江学者和创新团队发展计划项目(IRT1084);江苏高校优势学科建设工程资助项目

摘　　要：针对U型钢截面反拱梁失稳破坏问题,应用CAD与ANSYS两软件联合建立U型钢反拱梁有限元模型,采用ANSYS内置的非线性屈曲分析模块,模拟分析U25,U29和U36这3种不同截面反拱梁在承受径向均布载荷条件下临界屈曲载荷和极限承载力与反拱圆心角之间的关系,并在求解过程中监测跨中节点竖向载荷-位移曲线。ANSYS数值模拟分析结果表明:3种截面反拱圆心角在70°时临界屈曲载荷达到最大值,随后圆心角加大则屈曲载荷平均以4.0%的速度缓慢下降,表明反拱梁在圆心角70°时稳定性最好;当反拱梁圆心角小于70°时,反拱极限承载力以34.3%的增幅递增,呈快速增长趋势;当圆心角大于70°时,反拱承载力则以14.5%的增幅缓慢增长,增幅速度较为平缓。研究结果为工程应用提供了可行方法和理论依据。In order to solve the instability problem of antiarch beam with U-shaped steel section, finite element model of which has been built with the co-assistance of CAD and ANSYS, the built-in non-linear buckling analytical module has simulated three kinds of sections including U25, U29, and U36 respectively, and all of them is under the impact of radical uniformly distributed load, thus rela-tionship between buckling load, ultimate bearing force and central angle of antiarch is able to come into being, where the curve between vertical load and displacement of the uttermost point in the antiarch is monitored. The results have shown that, critical buckling load reaches its peak value as central angle is 70° as to all those three sections, then the load will glide down at the rate of 4.0%with the continuous increase of the angle, it thus manifests that 70° for central angle is optimum for overall stability. If the angle is less than 70°, the load will mount at the rate of 34.3%, however, if the angle is more than 70°, the mounting rate of the load will mitigate at the rate of 14.5%. The results have provided feasible me-thodology and theoretical foundation for engineering practice.

关 键 词：U型钢 反拱梁 极限承载力 屈曲载荷 稳定性 

分 类 号：TD311[矿业工程—矿井建设]