The Diseases Mechanism Analysis And Maintance And Strengthening Of Prestressed Concrete Chord-stayed Truss T Rigid Frame Bridge

Prestressed concrete chord-stayed truss T rigid frame bridge is a novel bridge structure,itis made up of the cable-stayed structure, truss structure and the T-shaped rigid frame This typeof bridge upper chord support of vertical component of bottom chord, forming elastic supportcontinuous beam, upper chord horizontal component of the formation of bottom chord stiffeningeffect, force similar to cable-stayed bridge; Axial force of bar were greater than bending moment,its components are two apparent force rod mechanical characteristics, the axial force controldesign, force similar to truss bridge; Dead weight and the effect of prestressing, the biggest effectis small, other load stress characteristics of continuous rigid frame. Its weight light, stiffness big,clear, beautiful appearance, but this kind of bridge across different set in the shear hinge and edgeset of tension and compression bearing damage, often affect the bridge structure’s safety and use.So the disease mechanism of this kind of bridge maintenance and strengthening scheme is ofgreat significance. The main research contents are as follows:（1）Based on hong tong bridge in fujian province as the research object, through theestablishment of T structure finite element model of prestressed concrete truss-stayed bridge mainstress components, including the upper chord and bottom chord, T girder and v-shaped piers,mechanical characteristics analysis, summed up the internal force of members under differentload conditions, the changing rule of the stress and displacement.（2）With field survey report, in view of the cause of prestressed concrete truss-stayed bridgeT bridge disease factors of theory analysis and sensitivity analysis, and through the orthogonaldesign of experiment analysis of multiple factors combination of disease mechanism, using SPSSsoftware to calculate the orthogonal table, sensitivity to parameters of importance are put forward.（3）Composite prestressed concrete truss-stayed bridge T bridge disease mechanism andparameter sensitivity analysis, formulate preliminary pond bridge maintenance plan, to provide areference for the relevant departments.