Experimental Study on Shear Behavior of Precast Concrete SegmentalBeams with Hybrid Tendons and Dry Joints

A series of tests were carried out on nine specimens to improve the understanding of the shear behavior of precast concrete segmental beams (PCSBs) with hybrid tendons and dry joints. The influences of the tendon layout (hybrid tendons and external tendons), shear span ratio, and joint type (monolithic joints, and dry joints) on shear behavior of PCSBs were experimentally studied. The test results indicated that hybrid tendons slightly improved the shear strength and stiffness of PCSBs with dry joints compared to external tendons. The shear strengths of PCSBs with hybrid tendons and dry joints reduced with an increasing shear span ratio. Compared to monolithic beams with hybrid tendons, the dry joints slightly decreased the shear strength and enhanced the nonlinear behavior of PCSBs with hybrid tendons. The shear strengths of PCSBs and monolithic beams can be conservatively predicted by the AASHTO, Chinese code, and British Standard. The strut-and-tie model of prestressing force can accurately estimate the shear strengths of all the beams.