摘要
近年来,对工业厂房的调查结果显示,大吨位、重级或超重级工作制起重机的钢吊车梁在反复荷载的作用下,大部分均过早地出现了不同程度的疲劳裂缝,危害生产安全。因此通常将吊车梁结构的疲劳寿命作为控制安全性的主要指标。疲劳寿命的评估参数及指标和实际的荷载存在较大的差异,还有吊车梁的结构形式、受力状态、制作工艺都是影响疲劳寿命的主要因素。目前已有技术人员对钢结构吊车梁疲劳寿命的基本理论进行了深入的研究且提出了多种评估方法,但每种评估方法都有一定的局限性,而且目前尚缺乏较好的评估方法。因此,寻求一个更加合理的评估方法以期能较准确地计算吊车梁的疲劳寿命就显得十分必要。本文主要采用细节疲劳额定值法(DFR法)计算钢吊车梁的疲劳寿命。
In recent years,according to the survey of industrial plant,most of the crane steel crane beam with large tonnage,heavy grade level or overweight duty prematurely appeared different degree of fatigue crack under the action of repeated load,and endanger the safety in production.So the fatigue life of crane beam structure is usually considered as the major indexes of the safety control.The evaluation parameters and index of fatigue life is great different from the practical load,and the structure form,stress state,production process of crane beam are the main factors that influence the fatigue life.At present,the technology personnel has done further research to the basic theory of the fatigue life of steel crane beam and has put forward a variety of evaluation methods.But we can see that each evaluation method has some limitations,and there is no better assessment method.Therefore,to seek a more reasonable evaluation method so as to more accurately calculate the fatigue life of crane beam is very necessary.This paper mainly uses the details fatigue rating method（DFR method） to calculate the fatigue life of steel crane beam.
出处
《价值工程》
2012年第16期36-37,共2页
Value Engineering
