Seismic behavior of full-scale T-shaped joints connected by through-tie rod in MIC

Modular integrated construction (MIC) is a more advanced form of prefabricated construction and has been increasingly used in buildings with repeating units. In this paper, a new type of through-tie rod connection joint that can meet the functional design requirements of modular buildings was proposed. The monotonic and cyclic tests under different axial pressures were carried out on four identical T-shaped joints. The seismic performance of the joints, including initial stiffness, bending capacity, ductility, and energy dissipation, were evaluated in detail. The results showed that the axial force ratio had a significant effect on the seismic performance of the joint. Within a certain range, the greater the axial force, the better the seismic performance of the joint. The performance of the beam-to-column connection had an important impact on the ductility of the joint. In addition, according to the test results, a corresponding mechanical model was established. The stiffness and bearing capacity of the joint were theoretically calculated and compared with the test results, which indicate that this joint is a partial strength joint. Finally, the corresponding design methods and design suggestions were put forward, which provided a useful reference for the connection and the application of MIC in the seismic area.