剩余强度广义应力与桥梁钢索的破断--论检测索力不能评定钢索的服役安全性  

Generalized stress and residual strength for the bridge wire rope breaking——Discussion on the cable detection to assess the service security

作　　者：汤国栋[1] 廖光明[1] 严斌 樊鸿[3] 

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]Mott MacDonald,北京100100 [3]四川省交通运输厅公路局,成都610041

出　　处：《上海公路》2017年第1期25-30,共6页Shanghai Highways

摘　　要：由于载荷及环境介质作用的随机性、共同性或耦合性以及协合效应等,桥梁钢索的服役破断是不确定的。导致钢索断裂的是损伤热点的广义应力;控制钢索断裂的是剩余强度。基于疲劳断裂理论、材料失效分析(所谓材料诊断学)、结构完整性科学建立的服役安全性评定准则:为实际的广义应力小于剩余强度。以检测索力计算的名义应力,与桥梁钢索的破断无直接关系;检测索力、设计准则,不能评定钢索的服役安全性。Because the randomness and the commons,synergistic and coupling characters of the load and environmental effects,the cable broken in service is uncertain.The reason leading to the cable failure,is the generalized stress;the reason controlling cables break is the residual strength.Based on fatigue fracture theory and materials failure analysis(so-called material diagnostics) etc.,the service security assessment guidelines based on the structural integrity is that generalized stress should be less than the residual strength.The nominal stress calculated based on the detection has no direct relationship with the broken of bridge cables;the detection of cable force,design criteria cannot assess the cable' s security.

关 键 词：桥梁钢索 索力检测 安全评定 剩余强度 广义应力 

分 类 号：U446[建筑科学—桥梁与隧道工程]