The Energy Dissipation Principles And Seismic Design Method Of Steel Beam's High-strength Bolted Splice In Steel Frames

Using steel beam's splice to dissipate seismic energy is one of the means to improve the structural seismic performance. In recent years, a lot of research on this kind of energy dissipation has been carried out, but experimental studies are few. In this article, for the first time, experimental test and finite element simulation of steel beam's splice using slotted holes was done to study the energy dissipation performance.Three specimens of rigid steel frame joint with cantilever beam slotted-hole splicing were tested in this article; particular attention was paid to energy dissipation principles of high-strength bolted splice using slotted holes. Research results showed that it is feasible to utilize splice's friction to dissipate seismic energy. If it simply relies on the friction between faying surfaces, in addition to good stability of anti-slip coefficient, the energy dissipation performance will be very good. If we want to dissipate seismic energy by using the extrusion between the bolt and the slotted hole, the plastic deformation of splicing plates, the result will be counterproductive, however, it can enhance specimen's bearing capacity.Finite element modeling considering material, geometry and state nonlinear is also carried out to study splice's joint design parameters'influence on energy dissipation. It showed that:flange splicing plates should have the same thickness to the steel beam flange. Or the central line of flange splicing plates'cross-section should coincide with that of beam flange, and the summation of flange splicing plates should not be less than beam's flange. Or the flange splicing plates should have the same thickness and their summation of thickness should not be less than beam flange; The size of slotted hole has important impaction on energy dissipation performance. The specimens with good energy dissipation performance should have suitable slotted holes. The distance between splice center and the closer column flange surface should be 0.8-1.0 times of beam height.Finally, design recommendations on how to utilize beam's splice to dissipate seismic energy is given out.