Research on pretensioned modular frame test and simulations

Corner supported modular system possess promising ability for high compression bearing which is suitable for high rise modular buildings. The economical approach to transfer forces and moments is to develop a more rigid connection between modules. This study investigated the seismic performance of a framed modular system with pretension assembled intermodular connections. A quasi-static loading test was performed on a full-scale pretension assembled framed modular system, with a loading process based on different earthquake design levels in China. Then, a simplified finite element modelling method was proposed to simulate the assembled compositions, and the effectiveness was verified with test data. Results showed that the pretension assembled connection had comparatively rigid connecting behavior. The modular frame had acceptable strength and stiffness within fortified intensity shake earthquake levels, and it satisfied ductility requirements without much structural failure. The frame exhibited self-centering deformation restoration after loading, and the strength degradation was mostly due to bonding loss within modular columns. Simulation results indicated that the pretension assembled framed modular system had different internal stress distribution from the traditional frame because of assembled compositions.