Abstract: In recent years, earthquake disasters have occurred frequently. Traditional steel structure buildings have large residual deformations after earthquakes and are difficult to repair. However, self-centering structures have achieved the anti-seismic goal of minimal damage in the earthquake and continued to use without repairing or minor repairing after the earthquake, which has been widely concerned by scholars at home and abroad. A new type of high-efficiency assembly self-centering steel frame structure system based on prestressing technology and bolt connection has been proposed in recent years, and the goal of high-efficiency assembly without high-altitude tensioning and short construction period is achieved under the premise of similar functions to the traditional self-centering steel structure system. On this basis, an efficient assembly steel frame with slotted steel plate shear wall structure was proposed and the pseudo-static test study of the structure was completed. The structure is mainly composed of two parts, a high-efficiency assembly steel frame and a slotted steel plate shear wall respectively, which are connected by high-strength bolts to achieve efficient assembly. The high-efficiency assembly steel frame is composed of steel columns and prestressed steel beams, which are connected by steel strands and high-strength bolts.
The ABAQUS finite element software was used to numerically simulate the structure test of the high-efficiency assembly steel frame with slotted steel plate shear wall. The main components such as steel columns, prestressed steel beams and steel plate shear walls in the high-efficiency assembly steel frame structure were all adopted C3D8R eight-node hexahedral linear elements, and the prestressed steel strands adopted T3D3 three-dimensional three-node truss elements. The effects of geometric nonlinearity and material nonlinearity were considered when calculating the model, and the numerical simulation adopts the same displacement loading system as the experiment. The test and numerical simulation of the structure ended at elastoplastic story drift limit 1/50.
The numerical simulation and test results were compared and analyzed to verify the reliability of the finite element analysis method. At the same time, to further study the seismic performance of the high-efficiency assembly steel frame with slotted steel plate shear wall and the effect of the slotted steel plate shear wall, the performance of the high-efficiency assembly steel frames with and without slotted steel plate shear wall, such as hysteresis curves, energy consumption performance, stiffness, self-centering capacity and equivalent plastic strain were compared and analyzed.
The results show that the hysteresis curve and frame gap opening width obtained by the numerical simulation are in good agreement with the test, and the effect of the opening and closure mechanism of the node can be simulated well. Efficiently assembled steel frame with slotted steel plate shear wall has a good opening closing mechanism and self-centering capability, high initial rigidity, good energy consumption capacity, and high lateral bearing capacity. Efficiently assembled steel frame with slotted steel plate shear wall structure has small residual gap opening, and the maximum force during the test is much smaller than the yield force of the steel strand. The high-efficiency assembly steel frame basically maintains elastic state except for the slight plasticity at the column feet, which provides a good foundation for the structure to withstand greater earthquake action. By comparing the numerical simulation results of the high-efficiency assembly steel frames with and without slotted steel plate shear wall, it can be seen that the slotted steel plate shear wall can effectively improve the rigidity of the structure and energy consumption capacity. The energy consumption of the slotted steel plate shear wall buckling can provide good protection of the main structure of the frame, so that the function of the main structure can be quickly restored by replacing the slotted steel plate shear wall after an earthquake.