摘要
吊车设计使用年限越长,在实际运行中荷载最大值出现的可能性越大,在考虑其荷载效应组合时应以设计使用年限作为参数,取荷载最不利值。确定吊车荷载概率模型时,采用平稳二项随机过程理论,依据观测周期内统计所得的任意时刻的概率模型(极值Ⅰ型分布),最终确定不同设计使用年限中吊车荷载最大值的概率模型(极值Ⅰ型分布)和统计参数。随后在进行工业厂房的荷载效应组合时,以吊车荷载作为主导荷载,应按最不利情况考虑。根据统计分析,最不利工况一方面取影响线内吊车出现的概率为100%,另一方面考虑多台吊车出现在影响线上位置的不确定性,采用修正Turkstra规则,确定多台吊车荷载组合效应的概率模型为极值Ⅰ型,并通过误差传递公式计算相应的统计参数。
The longer the design working life be used, the higher possibility of maximal crane load that appears in the actual operation will be. When considering the crane load in combination with action effects, working life should be designed as a time parameter, and use the most unfavorable value. When determining the crane load probability model, lessons are drawn from the theory of stationary binomial random process. On the basis of the probability model （extreme I-type distribution） about any statistical point value in observation period, the probability model （extreme I-type distribution） and statistical parameters about crane load maximum in different design working life are ultimately confirmed. Then, in the load combination, crane load as the dominant load should be taken into account by the most unfavorable case. According to the statistical analysis, on the one hand, the probability is thought of 100% about desirable crane appeared within the influence lines. On the other hand, the position of the crane in influence hne is random. The Turkstra rules are amended on the multiple crane load effects combination within the influence line. The probability model of crane load combination effect is determined as extreme l-type, and the statistical parameters are obtained through the error transfer formula calculation.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第11期160-166,共7页
Journal of Building Structures
基金
国家自然科学基金项目(50678143
51278401)
"十三五"国家重点研发计划(2016YFC0701301-01)
关键词
吊车荷载
概率模型
影响线
组合效应
可靠度
crane load
probability model
influence line
effect of combination
reliability
