The Effect Of Bearing Failure Of Bridge Structure And Failure Criteria

Bearing’s performance is related to the safety of the bridge structure, as an important component in bridge engineering.In recent years, the wide use of support, a variety of different diseases, such as rubber aging phenomenon and the product itself quality problem,including the design of the bearing, bearing of the selection and layout, the construction and installation of bearings, bearing in the process of operation of the inspection and maintenance is not reasonable causing of bearing damage. Bearing as a bridge structure is an important component.However, its damage belongs to taking cover engineering, it is very hard to detect its damage degree. Therefore, I research the influencing of the structure of the bridge bearing failure and failure criteria.This article supports disease research, summes up the bearing disease types, and then analyzes the bearing degradation process mechanism analysis and all kinds of diseases. As to provide theoretical basis for follow-up study bearing damage.Papers selected 20 m simply supported T beam, the finite element model to simulate bearing stiffness reduction and stiffness wreck not occurring is 0.8, 0.6, 0.4, comparison and analysis the different reduction factor for static and dynamic effect of the structure of the bridge. With vertical reaction force value of rubber bearing, the vertical shear stress of the pavement, pavement layer of transverse shear stress, the vertical normal stress and maximum stress of the T beam as an index, the effect value were analyzed; And 20 m simply supported slabs and 3 x 40 m consecutive T beam, the finite element model is used to simulating the complete failure part influence on adjacent bearing, analyzes the different type of bridge structure, the dead load and live load in different conditions, the bearing failure and edge support adjacent bearing reaction force of impact. Found some support complete failure regardless of the beam bridge and continuous girder bridge of counteracting force influence is bigger, counteracting force value increased nearly three times the biggest, the possible causes of the bearing crushing plant disease. And part of the bearing will complete failure of continuous girder bridge in negative bending moment of the pier top value also has a great influence, structure unreasonable stress.Paper put forward the plate rubber bearing damage rating standard by analyzing the load bearing test laboratory, field test measured data, combined with the building railway tunnels degradation assessment standards and local standards of jiangsu province "the technical standards of highway bridge rubber bearing damage assessment".