Study On Bridge Damage And The Relationship With Deterioration Of Bearing Capacity

The bridge structure damage and diagnosis is a complicated and advanced problem, which disturbed the scientists for a long time. The bridge structure suffered the moisture, frog and load attack successively in natural state, this results in concrete carbonization, reinforcing steel bar erosion, the surfer desquamate, the cross section dimension decrease, so the mechanics performance worsen, the bridge bearing capacity decreases. It is necessary to study the relationship between the bridge damage and the bearing capacity.The bearing capacity decreased with the time is out of the question. Based on the existed research achievements, the BP network model which forecasts the carbonization depth is putted forward in this paper. The reinforcing steel bar erosion model is improved. The bridge damage degree is analyzed by blur integrate assess method. Based on the structure reliability theory, the load and anti-force model is erected, the computer program is compiled, and the parameter factor sensitivity which effects the bridge capacity is analyzed also. The calculation value of Monte-Carlo method is compared with BP network.According to The analysis model and calculation method, the main factors resulted in the bridge capacity decreasing are taken into account in this paper, which provides credible theory foundation for old bridge evaluation, makes the maintain scheme more reasonable, and favorite to increase the bearing capacity and prolong the bridge life.