Hysteretic Behavior Of Steel Frame Filled With Steel H-beam

Steel frame is a common structure system. It will cause larger lateral displacement under horizontal earthquake or wind load due to its small lateral stiffness. In order to improve the lateral resistance of steel frame structure, we often implement dual system to resist lateral force. Steel frame system infilled with shear wall, steel frame system infilled with deep beam and braced steel frame system are common dual systems. Based on the existing dual system, this paper puts forward a new type of structure system-steel frame filled with steel H-beam(SHBF). In this structure, we fill the steel frame with H-beam after we completed the construction of the main steel frame, and the H-beam will be a lateral force-resisting member. The H-beam can connect with frame beam by high strength bolts. As the first line of defense for seismic fortification, the H-beam improves the lateral stiffness of structure and dissipates earthquake energy in the meantime. In normal use of the structure, the design of the frame beam’s deflection should meet the requirements of serviceability limit state, and the H-beam doesn’t withstand vertical force because it is installed after the completion of the main body structure construction. When earthquake happens, the structure forms active beam link on both ends of the frame beam firstly, and dissipates the earthquake energy by the plastic deformation of active beam link. At the same time, the H-beam can consume the seismic energy by forming plastic hinge at both ends because its material strength is lower than the frame main body.Using finite element software ANSYS to establish model, we analyze and compare hysteretic behavior of the traditional steel frame structure and steel frame filled with steel H-beam, and analyze a series of parameters of the new structure, then knows the ratio of H-beam’s spacing and the frame beam’s span, material strength of the active beam link, web thickness of the active beam link, the stiffener’s thickness and spacing of the active beam link, and the section size of the H-beam’s influences on the new structure. The results show that the new structure’s initial stiffness and bearing capacity index are obviously larger than the traditional steel frame. Although the energy dissipation coefficient changes little, the ductility coefficient nearly increases by 35%. This indicates that the ductility performance of the new structure is very good, which meets the seismic requirements. In addition, steel frame filled with steel H-beam is flexible in arrangement, which enables the aisle and window arranges easily. It not only can be used to a new structure, but also can be used for structural reinforcement. It has broad application prospect.