Internal Force Monitoring System Design For Long Span Bridges Based On Ultimate Bearing Capacity Ratios Of Structural Components

In order to provide a novel strategy for long-span bridge health monitoring system design,this paper proposes a novel ultimate bearing capacity ratios based bridge internal force monitoring design method.The method is based on the ultimate bearing capacity analysis of the long-span bridge structure.Then,the component ultimate bearing capacity ratio,the uniformity of ultimate bearing capacity ratio,and the reference of component ultimate bearing capacity ratio are defined.According to the analysis of the parameters of the ultimate bearing capacity ratio,the high bearing components in the structure are determined,and the internal force monitoring system can be designed.The research of this paper has important theoretical significance and practical application value.It also can provide basis for internal force monitoring system design monitoring of long span bridge structures.The main research contents and conclusions of this paper are as follows:1.The long-span bridge ultimate bearing capacity analysis theories and methods are first described.Then,based on the ultimate bearing capacity of the structural component,the component ultimate bearing capacity ratio,the uniformity of ultimate bearing capacity ratio,and the reference of component ultimate bearing capacity ratio are defined.2.Based on the defined indices,the high bearing components can then be found,and the internal force monitoring system can be designed.3.The proposed method is applied to the bridge health monitoring system design of the second highway bridge of Wuhu Yangtze river.Through the ultimate bearing capacity analysis of the bridge in six load conditions,the high bearing components are found based on the proposed method.The bridge internal force monitoring system is then preliminarily designed.4.The results show that the proposed method can provide a quantitative criteria for sensors layout.The monitoring components based on the proposed method are consistent with the actual failure process of the bridge,and can reduce the monitoring of low bearing components.For the second highway bridge of Wuhu Yangtze river,only 59 components are designed to be monitored their internal forces.Therefore,the bridge internal force monitoring system based on the ultimate bearing capacity ratio can decrease the number of monitored components and the cost of the whole monitoring system.