Reinforced Concrete Bridge Structure Damage Assessment Study

According to the load behavior and defection degrees of existed reinforced concrete bridge, the calculating modeles for normal section strength and bearing capacity for reinforced concrete bridge are established by the elasticity analysis and nonlinear analysis of grade stiffness degeneration. In the current criteria, the principal parameters are given from linear elasticity analysis. The effects of cumulation in elasto-plastic working stage is hardly analysis. The stiffness calculation of current eccentric compression member is not specialy stipulated, with the result that the calculation of internal forces are crude. Based on the nonlinear behavior of concrete, the change feature of the element stiffness matrix and the method of grade stiffness degeneration for crack columns under various load are presented, and the methods of calculation and nonlinear analysis on the section stress of reinforced concretes under different load stage are discussed. The numeral simulation of structure defection diagnosis and nonlinear analysis of space structure to one reinforced concretes bridge is achieved. The results obtained show the effects of defection cumulation material nonlinear and internal force distribution are remarkable with increase of crack element. The theoretical analysis squares with the test results of bridge. The nonlinear method of grade stiffness degeneration is very effective to simulate defection situation and evaluate bridge load capacity, the method of nonlinear analysis from this paper provides reliable quantitative analysis way to static evaluation and reform existed bridge, and has potentially applied valuation to practical engineering.