Study on the shear behavior of externally prestressed segmental glued concrete beams

Abstract

For segmental precast assembled bridges, joints are the key to their overall strength, especially their shear strength. Using shear span ratios (1.0, 1.3, 1.6), prestress levels (0 MPa, 2 MPa, 4 MPa) and beam types (segmental beam, monolithic beam) as the influencing factors, five segmental glue joint beams and one monolithic beam were fabricated for static load tests, and the laws of the above three factors on the shear performance of externally prestressed segmental glued concrete beams were obtained. The results show that all specimens exhibited brittle failure characteristics, and the prestressed specimens had better ductility. By reducing the shear span ratio and increasing the prestress level, the shear bearing capacity and overall stiffness of the specimens were improved, and the ductility of the specimens with a low prestress level was better. The shear bearing capacity of monolithic beam was higher than that of segmental beam, but the difference between them was not significant. Based on the test results, numerical models were developed and their validity was verified.