“贝壳板”加固直角突变式钢吊车梁疲劳性能研究  

Study on Fatigue Behavior of Right-angle Mutational Steel Crane Beam Reinforced with“Shell Plate”

作　　者：胡宝琳[1] 徐宇豪[1] 左志远 庄继勇 周磊[1] HU Baolin;XU Yuhao;ZUO Zhiyuan;ZHUANG Jiyong;ZHOU Lei(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China;Baowu Equipment Intelligent Technology Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444 [2]宝武装备智能科技有限公司,上海201900

出　　处：《湖南大学学报（自然科学版）》2024年第9期55-65,共11页Journal of Hunan University:Natural Sciences

基　　金：国家科技重大专项资助项目(2018ZX06001001);国家自然科学基金资助项目(52078287)。

摘　　要：针对既有直角突变式钢吊车梁,提出一种“贝壳板”加固方法,即在吊车梁变截面处腹板两侧,焊接带圆弧的“类贝壳式”钢板对吊车梁进行疲劳加固的方法.该加固方法是通过增加变截面区域腹板的刚度来降低疲劳细节的应力水平,从而提高其疲劳强度.通过缩尺疲劳试验对使用“贝壳板”加固后的直角突变式钢吊车梁疲劳性能进行了研究,分析“贝壳板”加固后吊车梁的疲劳破坏规律,评估加固后吊车梁的疲劳性能.以加固后吊车梁最危险疲劳细节的主应力为基本参量,给出了加固后吊车梁的设计S_(r,p)-N疲劳曲线.并通过试验结果验证了加固后吊车梁裂纹扩展模拟和寿命计算的正确性,进一步分析“贝壳板”加固后吊车梁破坏细节的疲劳裂纹扩展特性,研究“贝壳板”高度和厚度变化对加固效果的影响,可为吊车梁的加固设计提供参考依据.A consolidating method of“shell plate”aiming at the existing right-angle mutational steel crane beam is proposed,where a“shell type”steel plate with an arc is welded on both sides of the web at the variable section of the crane beam for fatigue reinforcement.The stress level of fatigue detail is reduced by increasing the stiffness of the web in variable section areas,thus improving its fatigue strength.In this paper,the fatigue performance of a right-angle mutational steel crane beam reinforced with“shell plate”is studied through a scaled fatigue test,the fatigue failure law of the crane beam reinforced with“shell plate”is analyzed,while the fatigue performance of the reinforced crane beam is evaluated.Meanwhile,taking the principal stress of the most dangerous fatigue detail of the reinforced crane beam as the basic parameter,the S_(r,p)-N fatigue curves of the reinforced crane beam are given.Moreover,the correctness of crack propagation simulation and fatigue life calculation of the crane beam after reinforcement is verified by the experimental results,and the fatigue crack propagation characteristics of the crane beam damage details after the“shell plate”reinforcement are further analyzed.The influence of the variation in thickness and height of the“shell plate”on the reinforcement effect is studied,which provides the reference for the crane beam reinforcement design.

关 键 词：“贝壳板”加固 吊车梁 裂纹扩展 疲劳寿命 疲劳试验 

分 类 号：TU391[建筑科学—结构工程]