Experimental study on seismic behaviors of steel frames with Haunch Reinforced Section connections
Dong Jianli1, Wang Yan1, 2, Zhuang Peng1, Li Qinggang1
1. Qingdao Technological University, Qingdao 266033, China; 2. Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, China
Abstract：In order to investigate the seismic performance of steel frames with haunch reinforced section joints, a pseudo-static experiment for a 1∶3 scale space steel frame with haunch reinforced section was conducted, including the study on the loading-displacement hysteresis curve, the skeleton curve, the lateral stiffness, the inter-story displacement angle, the bearing capacity degeneration, and the plastic energy dissipation capacity etc. The experimental results show that the loading-displacement hysteresis curves of the southern and northern steel frames comprising the whole space frame are plump and symmetrical, the skeleton curves show Spattern, and the inter-story displacement angles range from 4.29% to 5.99%. No weld cracks emerge at eight haunch reinforced section joints in the experiment, while great plastic deformation appears at the beam flange and web. The steel frame with haunch reinforced section connections exhibits good energy dissipation capacity under cyclic loading, and the energy dissipation is full. Under equal-amplitude loading, the capacity degradation coefficient of the two steel frames increases slowly, and the space collaboration effect to certain extent improves the bearing capacity of the steel frames.
