The Research And Application Of The Variable Weight Synthetic Assessment Method For Health Condition Evaluation Of Cable-Stayed Bridge

Aable-stayed bridge is large step bridge , it need more huge investment,also it bears traffic lifeline of country and affect the national economy and the people's livelihood.So it seems more difficult to evaluate the health of these large cable-stayed bridges.This thesis synthesized research the health evaluation of cable-stayed bridge based on analytic hierarchy process(AHP),grey relation theory and variable weight theory. The main contents are as follows:Firstly, the definition of AHP,grey relation and variable weight theory are elaborated,and compositing these three methods bring up the variable weight synithetic assessment basing on AHP and grey relation. According to AHP this text ded the structure of cable-stayed bridge with pass hierarchy ,and also build a comprehensive and reasonable assesement model in connection with structure trait,mechanics property and loading test.refer to "evaluation and detect rules of highway bridge" , "maintain standard of highway bridge" and other evaluation rules, this text makes expert weight matrix. And also it gets index weight of cable-stayed bridge by analysis and calculation.Secondly, at calculation method of evaluation, classify to evaluate detect index combine with grey relation theoryand variable weight theory. It reflect part severe plant disease of bridge technology condition making use of variable weight theory to evaluation inex. And calculate grey relation to some date sequence by grey relation, so as to effectually make up for the unbalance and sidedness.Finally, the text analyzes norminal standard and evaluation method taking example for Baisha bridge. It evaluate the vibration property and mechanics function combining with loading test, and makes comprehensive health assessment to whole bridge with the proposed model and method.The the variable weight synithetic assessment basing on AHP and grey relation and evaluation model combining loading test are proved feasible and reasonable through application to real bridge and model contrast.