The Key Technology Of Tibet Bridge Comprehensive State Evaluation Application

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 this situation, the paper proposes the assessment techniques of the existing bridges integrated condition in Tibet by the use of AHP and fuzzy comprehensive evaluation method, it can provide a reliable basis of the disposal of existing bridge by the Tibet regional management.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.Finally, on the basis of sub-indices identification technology, the paper can give a fuzzy mathematics assessment of general state of bridges during service in Tibet,and make applications of relying project and test.The paper is positive and realistic significance to give a comprehensive assessment of existing bridges in Tibet objectively, to deal with the bridges in service scientifically, to save construction funds and accelerate the pace of road construction, and to improve the quality of road construction and maintenance.