钢制立体停车结构梁柱节点抗疲劳性能研究  

Research on Fatigue Resistance of Beam-column Joint in Steel Tridimensional Parking Structures

作　　者：罗春波 贺拥军[1] 向思宇 LUO Chunbo;HE Yongjun;XIANG Siyu(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《郑州大学学报（理学版）》2023年第3期87-94,共8页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金项目(51890902,51878261)。

摘　　要：立体停车结构是一种特殊的结构体系,其在服役过程中将承受因提升、横移车辆产生的交变载荷。为解决立体停车结构存在的抗疲劳设计问题,运用概率统计方法,建立了适用于立体停车结构的交变荷载谱;基于验证后的疲劳分析方法,对节点截面尺寸、轴压比、横移轨道偏心距进行了参数分析,揭示了不同参数影响节点疲劳寿命的作用机理,并提出了相应的经验计算公式;基于断裂力学原理,对所提公式进行了验证。结果表明:梁柱翼缘交接处的焊缝是疲劳破坏发生的最敏感部位;增大梁截面高度可显著增加节点疲劳寿命;柱轴压比越大,节点疲劳寿命越长;轨道偏心会大幅降低节点疲劳寿命,当轨道位于横梁边缘时降幅达78%,因此,轨道偏心的影响在抗疲劳设计中不应忽略。As a specific structural type,tridimensional parking structures would suffer an alternating load caused by lifting and translation of vehicles in the service process.Focused on its fatigue design problem,and the main contents were as follows.The alternating load spectrum suitable for tridimensional parking structures was established with the probability statistics method.The influences of the parameters on fatigue life of joints were analyzed and the mechanisms were explained based on the verified fatigue analysis method,including the section size of joint,axial compression ratio and transverse track eccentricity.The corresponding empirical formulas for calculation were proposed and further verified according to the principles of fracture mechanics.The results indicated that:the weld bead on the flange junction of beam and column was the most sensitive zone of fatigue failure.Increasing beam height could significantly increase fatigue life of joints.The larger axial compression ratio of columns would cause the longer fatigue life of the joints.The track eccentricity could greatly decrease the fatigue life of joints,and the decreasing range was 78%when the track was arranged on the flange edge of the beam.Hence the influence of track eccentricity should be considered in fatigue design.

关 键 词：立体停车结构 疲劳寿命 荷载谱 概率统计 经验计算公式 

分 类 号：TU391[建筑科学—结构工程]