Abstract

Info

Author(s):: JIA Yi; LU Liang; JI Yun-ao; LI Jun-jin; School of Civil Engineering, Southwest Jiaotong University

Keywords:: bridge engineering; continuous girder bridge; experimental research; verification coefficient; efficiency coefficient; carrying capacity

Abstract:: In order to evaluate the technical condition and carrying capacity of Shunji River Bridge, four span continuous girders in the bridge were sampled to carry out static loading test. The strain and deflection of testing points in control sections were gained by test, and the results were compared with relative theoretical calculation values. The results show that load efficiency coefficients in all cases are between 0.95 and 1.05. Under different test cases, the measured stress calibration coefficients of T-beam are between 0.46 and 0.92, and the deflection calibration coefficients of test points are between 0.35 and 0.78.The structural strength and stiffness of the bridge have a certain degree of surplus, which can meet the actual operating conditions well. The relative residual strain and deflection of most measure points in controlling sections is 0 and most locations of the structure are in the elastic state. The partial strain and deflection points appear the residual strain and deflection, the relative maximum of which is 17.4% and 16.7% respectively, which indicates that the bridge has no large unrecoverable deformation under test load. The whole structure has reliable cross connection and uniform stiffness distribution. Technical condition and carrying capacity can satisfy normal serviceability requirements.