Seismic study on an innovative fully-bolted beam-column joint in prefabricated modular steel buildings

摘要

Prefabricated modular steel beam-column joints have a broad developing prospect due to their quick construction speed and standardization. A new type of site-bolted assembled joint has been developed. Compared to the traditional extended-endplate joints, it has a horizontal base plate welded to the column and can be integrated at floor level. In order to accurately evaluate the seismic performance of the new type joint under quasi static loads, a total of three tests (two beam-separation joints and a beam-through joint) were conducted on the full-scale interior column joints, obtaining the curve of hysteretic and stiffness degradation. In addition, the energy dissipation capacity of the joint was recorded and studied herein. It is demonstrated that the new type of joint has good seismic performance and can be used as a new form of standardized H-steel for prefabricated modular steel buildings. The extended plate and the strengthening of the panel zone can lead to the plastic hinge of the beam end to move away from the joint region. The key parameters that affect the performance of the panel zone are studied through the advanced finite element model (FEM) and the parametric analysis using Abaqus. It was noted that the load-bearing capacity could be significantly improved by increasing the thickness of the panel zone web and the beam flange. Finally, the simplified design of the joint was completed based on the experimental and numerical studies and Chinese code GB 51022?2015, to meet the engineering requirements.