焊接钢吊车梁抗疲劳加固的实验研究与分析  

Experimental analysis on crack resistance of a reinforced steel crane-girder

作　　者：曹芙波[1,2] 秦愫 魏宏刚 

机构地区：[1]南京航空航天大学土木系,江苏南京210016 [2]内蒙古科技大学建筑与土木工程学院,内蒙古包头014010 [3]昆区建设项目造价审定所,内蒙古包头014010 [4]中国二冶集团有限公司金属结构安装工程公司,内蒙古包头014010

出　　处：《广西大学学报（自然科学版）》2013年第4期832-837,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：内蒙古自然科学基金项目(2011MS0704)

摘　　要：为了探索一种加固方法能够有效的延长焊接钢吊车梁的疲劳寿命,通过角钢和高强螺栓对腹板及上翼缘进行加固,上翼缘与腹板的局部刚度增加,使得上翼缘变形受偏心荷载的影响减小,偏心侧上翼缘的挠度比加固前减小;通过脉动试验机进行200万次偏心集中荷载作用的加载实验,并对加固前后裂缝尖端主应力的大小及方向的变化分析,可以得出焊接钢吊车梁加固后的梁腹板应力差降低67.3%,偏心荷载产生的拉应力降低86.4%,应力幅降低24.2%。试验也验证了用角钢、高强螺栓对上翼缘及腹板进行加固这种方案的可行性,它延长了焊接钢吊车梁的疲劳使用寿命,对工业厂房中存在的焊接钢吊车梁的加固及维护有很好的指导意义。A strengthening method which can effectively prolong the fatigue life of welded steel crane beam is introduced. Using angle steel and high strength bolts, the web and top flange are rein- forced; the local stiffness of the web and top flange is increased; and the deformation influenced by the eccentric load is reduced. Through 2 million times of eccentric concentrated loading induced by a pulse tester, it was found that after welded, the reinforced steel crane-girder web stress, the ec- centric load due to the tensile stress, and the stress amplitude were reduced by 67.3% , 86.4%, and 24. 2% , respectively. The test also verifies that the strengthening with angle steel and high strength bolts is feasible, and it extends the fatigue life of the cracking steel crane-girder. These re- suits can provide a good guidance on reinforcing and maintaining the cracking steel crane-girder.

关 键 词：钢吊车梁 疲劳裂缝 偏心荷载 加固 

分 类 号：TU391[建筑科学—结构工程]