悬挂吊车作用下网架结构的疲劳载荷谱研究  

Fatigue Load Spectrum Research of the Grid Structure Under Suspension Crane Loading

作　　者：邱斌[1] 雷宏刚[1] 申彧 吉轩喆 QIU Bin;LEI Honggang;SHEN Yu;JI Xuanzhe(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院,太原030024

出　　处：《工业建筑》2023年第12期143-151,共9页Industrial Construction

基　　金：国家自然科学基金项目(51578357)。

摘　　要：悬挂吊车荷载作用下网架结构的疲劳问题在工业建筑领域备受关注。为研究网架结构在吊车荷载作用下的疲劳载荷特性,采用动态应变计对网架结构的杆件应力进行现场测试,得到实测的样本载荷数据。通过数据对比选择疲劳损伤严重的腹杆作为网架疲劳载荷谱的研究对象,综合运用数据处理、雨流计数及数理统计等方法,对设置悬挂吊车网架结构的疲劳载荷谱进行编制。在此基础上,根据悬挂吊车吊重及其频次的现场统计结果,拟合得到吊重服从对数正态概率分布模型,并给出了网架结构疲劳应力频值谱的简化分析方法,得到了网架结构在不同荷重分布参数下的疲劳应力频值谱,为设置悬挂吊车的网架结构疲劳寿命研究提供参考。The fatigue problem of the grid structure under the load of suspended cranes has attracted much attention in the industrial building field.In order to study the fatigue load characteristics of the grid structure under the action of suspension crane loads,the stress monitoring of the members in grid structure was conducted by using dynamic strain sensors,and the sample load data was obtained.Through data comparison,the web member with severe fatigue damage was selected as the research object,and the fatigue load spectrum of the grid structure was compiled by combining the data processing,rain-flow counting and mathematical statistics.Furthermore,according to the statistical results of the suspension crane loads and frequency,the log-normal probability distribution model of the lifting weights was established by fitting,and a simplified analysis method of fatigue stress frequency spectrum of the grid structure was proposed,the fatigue stress frequency spectrum of the grid structure under different load distribution parameters was obtained.These achievements will provide references for fatigue life study of the grid structure with suspended cranes.

关 键 词：网架结构 悬挂吊车 现场实测 雨流计数法 疲劳载荷谱 

分 类 号：TU356[建筑科学—结构工程]