体外预应力钢绞线加固钢吊车梁受弯性能试验  

Experiment on bending performance of steel crane beam reinforced by externally prestressed steel strands

作　　者：高志刚[1,2] 苗哲 何佳晨 张程华 秦卿[1,2] 张华 GAO Zhigang;MIAO Zhe;HE Jiachen;ZHANG Chenghua;QIN Qing;ZHANG Hua(College of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School Enterprise Joint Research Center of Underground Structure Earthquake Resistance,Shaanxi Province“Four Main Bodies and One Joint”,Xi’an 710054,China;China Xidian Group Xi’an Xidian New Energy Co.,Ltd.,Xi’an 710075,China;China Coal Xi’an Design Engineering Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]陕西省“四主体一联合”地下结构抗震试验校企联合研究中心,陕西西安710054 [3]中国西电集团西安西电新能源有限公司,陕西西安710075 [4]中煤西安设计工程有限责任公司,陕西西安710054

出　　处：《西安科技大学学报》2025年第2期351-361,共11页Journal of Xi’an University of Science and Technology

基　　金：陕西省重点研发计划项目(2024SF-ZDCYL-05-12)。

摘　　要：为有效解决传统加固钢吊车梁施工工艺复杂、难度高、周期长、成本高等问题,提出体外预应力钢绞线加固钢吊车梁法。共设计制作3根试验梁,加固组钢绞线施加预应力130 kN,通过静力加载试验,对加固梁和未加固梁的破坏形态、荷载-挠度曲线、梁跨变形规律及上翼缘、腹板、下翼缘的应变分布规律进行分析。结果表明:试件梁的破坏形态均为典型弯曲破坏,直线布线加固梁破坏时钢绞线跨中与梁下翼缘接触,加载点处屈曲;折线布线加固梁钢绞线在跨中断裂破坏,加载点处屈曲,钢梁发生回弹;当许用挠度达到6.75 mm时,未加固梁荷载为63 kN,直线布线加固梁荷载为71 kN,折线布线加固梁荷载为115 kN;直线布线加固钢梁极限承载力提高了29.36%,屈服荷载提高了17.07%,折线布线加固钢梁极限承载力提高了85.32%,屈服荷载提高了107%。研究认为折线布线加固钢梁效果最佳,能够有效提高钢梁承载力,对现有服役期工作的钢吊车梁加固设计有一定参考价值。In order to effectively solve the problems of complex construction technology,high difficulty,long cycle and high cost of traditional strengthening steel crane beam,the method of strengthening steel crane beam with externally prestressed steel strands was proposed.A total of three test beams were designed and manufactured.The steel strands of the reinforcement group were prestressed to 130 kN,through the static loading test,the failure mode,load-deflection curve,beam span deformation law and strain distribution law of the upper flange,web and lower flange of the reinforced beam and the unreinforced beam were analyzed.The results show that:The failure modes of the test beams are typical bending failure.When the reinforced beam is damaged,the mid-span of the steel strand contacts with the lower flange of the beam,and the buckling occurs at the loading point.The steel strand of the reinforced beam is broken in the middle of the span,the buckling occurs at the loading point,and the steel beam rebounds.When the allowable deflection reaches 6.75 mm,the load of the unreinforced beam is 63 kN,the load of the straight-line wiring reinforced beam is 71 kN,and the load of the broken-line wiring reinforced beam is 115 kN.The ultimate bearing capacity of steel beams strengthened by linear wiring increases by 29.36%,and the yield load increases by 17.07%.The ultimate bearing capacity of steel beams strengthened by polygonal wiring increases by 85.32%,and the yield load increases by 107%.The research shows that the effect of strengthening steel beams with broken line wiring is the best,which can effectively improve the bearing capacity of steel beams,and has certain reference value for the reinforcement design of steel crane beams working in the existing service period.

关 键 词：钢吊车梁 体外预应力 静力加载试验 变形 应变 

分 类 号：TU394[建筑科学—结构工程]