Research on the calculation model of shear key of adjacent precast concrete box beam bridge

摘要

In this paper, experimental study and finite strip method were used to analyze the lateral shearing performance of adjacent precast concrete box beam bridge shear key. According to the structural style and the load characteristics, the finite strip computational theory was introduced to derive the finite strip computational determinant of the adjacent precast concrete box beam bridge, study the computational method of the shearing performance of the shear key, and develop the corresponding computing program. Based on the field test of the adjacent precast concrete box beam bridge, the relative displacement difference of the shear key was proposed to judge the shearing performance and the lateral force transmission performance. The field test and numerical calculation results indicate that the relative displacement difference of the shear key can better evaluate the lateral shearing performance of the shear key and accurately distinguish the merits and demerits of the force transmission performance of the shear key. Compared with the commercial software which could not be used individually to deal with the shear key, the finite strip computational theory can use fewer elements to analyze the lateral shearing performance of the shear key with high computational efficiency. The comparison between calculating results with the experimental data verifies the accuracy and reliability of the computational theory and the computing program. The experimental and numerical analysis methods proposed in this paper can be used as the guidance for practical engineering.