直角突变式钢吊车梁疲劳性能及加固方法研究  

STUDY ON FATIGUE PERFORMANCE AND STRENGTHENING METHOD OF RIGHT-ANGLE CATASTROPHE STEEL CRANE BEAM

作　　者：郑云[1] 孙嘉伟 赵欣 崔涛 ZHENG Yun;SUN Jia-wei;ZHAO Xin;CUI Tao(MCC Construction Research Institute Co.,Ltd,Beijing 100088,China;CABR Testing Center Co.,Ltd,Beijing 100013,China;School of Civil Engineering,Hebei University of Technology,Tianjin 300401,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]建研院检测中心有限公司,北京100013 [3]河北工业大学土木与交通学院,天津300401 [4]清华大学土木系,北京100084

出　　处：《工程力学》2024年第S01期275-281,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51878017)。

摘　　要：钢吊车梁疲劳破坏问题造成了众多工业建筑的安全事故,也成为工业建筑领域长期的热点问题之一。直角突变式吊车梁是最常见的吊车梁形式,为研究直角突变式吊车梁的疲劳损伤机理和加固方法,改善传统式直角突变支座钢吊车梁的抗疲劳性能,在明晰吊车梁支座应力集中位置的基础上,提出三腹板构造的加固措施。采用有限元仿真分析与试验研究相结合的方法,探究了开孔设置方法和三腹板构造对带裂纹支座的加固效果;分析支座处加固前后应力集中部位沿焊缝长度方向的结构应力分布,验证了三腹板构造的工程实际加固效果。结果表明:相比于传统式直角支座,三腹板式支座各位置结构应力最大值下降了约60%,裂纹处应力强度因子下降了约50%;在无裂纹和带裂纹两种工况下,均大可大幅度提升吊车梁疲劳寿命。The fatigue failure of steel crane beams has caused many safety accidents and has become one of the hot issues in the field of industrial buildings.A right-angle crane beam is the most common form of crane beams.In order to study the fatigue damage mechanism and reinforcement method of right-angle crane beams and improve the fatigue resistance of traditional steel right-angle crane beams,the reinforcement measures of one three-web structure are proposed on the basis of clarifying the stress concentration position of a crane beam support.Through finite element simulation analysis and experimental research,the reinforcement effect of the setting method and the three-web structure on the cracked bearing is explored;the structural stress distribution along the weld length at the stress concentration position before and after reinforcement at the support is analyzed,and the reinforcement effect of the three-web structure is verified.The study results show that compared with the traditional right-angle bearing,the maximum structural stress at each position of the three-web bearing decreases by 60%,and the stress intensity factor at the crack decreases by about 50%;The fatigue life of crane beam can be greatly increased under both no cracked and cracked conditions.

关 键 词：工业建筑 吊车梁 疲劳性能 疲劳寿命 疲劳加固 

分 类 号：TU391[建筑科学—结构工程]