“U”型钢支架搭接处力学性能

发布时间：2018-11-08 11:20

【摘要】：为研究"U"型钢支架搭接处力学性能,通过室内实验和ABAQUS/EXPLICIT有限元软件模拟研究29"U"型钢支架搭接处卡缆在不同预紧情况下,支架的初始工作阻力及其轴向承载能力变化规律及特征;同时研究搭接处的受力、变形和缩动特性.研究结果表明:当螺母的预紧扭力增大时,支架的初始工作阻力、相对平稳期轴向承载能力和解除预紧的扭力都增大;"U"型钢支架搭接处轴向承载力不稳定,发生间歇性骤降,卡缆螺杆发生突然错动,支架的收缩性能不稳定;卡缆螺杆发生严重偏斜,造成螺杆超过抗拉强度发生断裂,导致搭接处卡缆失去作用,影响整个支架的完整性、稳定性和承载能力,影响煤矿安全生产.这对改善"U"型钢支架搭接处的搭接形式和接触方式具有一定的指导意义.
[Abstract]:In order to study the mechanical properties of the lap joint of "U" steel support, the cable clamping at the lap joint of 29 "U" steel bracket was studied by laboratory experiments and ABAQUS/EXPLICIT finite element software simulation under different pretightening conditions. The change law and characteristics of the initial working resistance and axial bearing capacity of the support; At the same time, the stress, deformation and shrinkage characteristics of the lap joint are studied. The results show that the initial working resistance of the support, the axial bearing capacity of the support and the torque to relieve the pre-tension increase with the increase of the pre-tension torque of the nut. The axial bearing capacity of the "U" steel bracket is unstable at the lap, the intermittent sudden drop occurs, the cable screw suddenly staggered, and the contraction performance of the support is unstable. The cable screw has a serious deflection which leads to the breakage of the screw over the tensile strength and leads to the loss of the cable in the lap which affects the integrity stability and bearing capacity of the whole support and affects the safety of coal mine production. It has certain guiding significance for improving the lap form and contact mode of the "U" steel frame lap joint.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2010CB226803)
【分类号】：TD353.2

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