基于模型试验的既有梁桥体系可靠度计算方法  

System Reliability Calculation Method Research of Existing Beam-Bridge Based on Model Test

作　　者：金宏忠[1] 高巍[2] 来猛刚[2] 

机构地区：[1]陕西省公路局,陕西西安710068 [2]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《沈阳建筑大学学报（自然科学版）》2011年第4期636-641,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078242/E080703)

摘　　要：目的计算梁式桥体系可靠度,为桥梁体系可靠度的进一步发展及体系层次的评定奠定基础.方法在梁式桥单梁失效概率基础上,研究多片梁在横向连接不同损伤情况下的关系.在横向连接无损伤状况下,采用失效指标法求取权值,然后加权求取体系可靠度进而计算体系可靠度.结果以最大横向分布影响线为基础,把体系失效概率分离为失效系数和单梁名义失效率的乘积进行计算,分析得到了失效系数的规律,推导出了失效系数计算公式α1=0.012n2x-0.075nx+0.518x+0.210n+0.490.结论将体系可靠度分离为失效系数和单梁名义失效概率,进一步明确了体系可靠度的概念,相对以往方法计算量小,具有较强的操作性.Based on reliability theory and single beam nominal invalidation probability,through analyzing the system probability could be calculated.First,for the bridges of transverse connection with no damage,the paper got system reliability with the weighted sum method,by using weight that calculated from invalid index.Second,for the bridges of transverse connection with some damage,according to model test of 5 pieces of T-beam,the system reliability was translated to the product of invalidation coefficient and single beam nominal invalidation probability on the base of transverse load-distributing influence lines.Finally,calculation formula（α1=0.012n2x-0.075nx＋0.518x＋0.210n＋0.490）of validation coefficient was derived from analyzing rules of the validation coefficient,and,system reliability was calculated quantitatively.Because the method is simple and objective,and the computational amount is small,it has made a further research for system reliability.

关 键 词：桥梁工程 体系可靠度 失效指标 横向分布影响线 失效系数 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]