Study Of Condition Evaluation Of Tibet Reinfor- Ced Concrete Beam Bridges

Tibet is a huge-geographical area, and the bridges in which are with multiple amount and widely destribution. Meanwhile bridge in tibet is in adverse condition. The normal carrying capacity evaluation technology of bridge is limited in tibet,which can only evaluate safety state of bridge at present and can't discriminate the usage status afterward. So it's not suit for discriminating bridges'state and making decisions. According to the stations mentioned before, aiming at the Tibetan building bridges, this paper proposed a series of sientific,appropriate and comprehensive evaluation system for briges'status, including carrying capicity, durability, functionality, strengthening economy and aesthetics.First of all,according to the disease survey of the bridges in Tibet region,the diseases types of existing bridges of the typical Tibetan areas are summarized, the physical and mechanical causes of various diseases are analysed. And further analysed the main factors which impact the bridge capacity, durability, functionality, strengthening economy, and aesthetics .In the second place, based on the level of analysis of theory (AHP), using the main factors which influence the bridge capacity, durability, functionality, strengthening economy, and aesthetics as the basic indicators, the evaluation system is established on which used capacity, durability, functionality, strengthening economy, and aesthetics as the grading index. And considering the weights of the bridge carrying capacity, durability, functionality, strengthening economy and aesthetics of different parts, a bridge condition assessment system of Tibet region is established, and a specific assessment process and the implementation process are given in detail.In conclusion, the method of evaluation for the bridges'comprehensive status, using in tibet, is dwelled on by example. The results shows that the assessment result is basically consistent with fact. The study has a positive significance for objectivley and scientifically using for the bridges'carrying capacity, guaranteeing the safety of existing bridges, saving construction funds, accelerating the pace of highway construction and improving the quality of highway construction.