Experimental Studies And Theoretical Analysis On Seismic Behavior For Steel Frame-Steel Plate Shear Wall Structures With Unstiffened Welded-bolted Connections

The steel plate shear walls(SPSW) is a new lateral resistance system. It has many advantages, such as higher lateral stiffness, better energy dissipation capacity and ductility capacity. Steel frame-steel plate shear wall system is a dual lateral resistance structure, which consists steel frame and steel plate shear wall. At present, studies on the behavior of the system is very few. In this dissertation, experimental studies and theoretical analysis are conducted on the seismic behavior for steel frame-steel plate shear wall structures with unstiffened welded-bolted connections. The main contents of this dissertation are described as followings:To build a prototype structure, a steel frame-steel plate shear wall structure with nine stories was design according to the corresponding specification and code in China. Based on the analysis of the validity of the dual resistance function of the structure, the influence of the SPSW on the internal force distribution of the beams and columns was obtained.1/3 scale was selected to design the test specimen based on the shear wall structures in the lowest two stories of the prototype structures. In order to consider the capacity of the steel plate shear wall after buckled, the thickness of the steel plate was less than that from the design result. Thus three specimen with two-story and single-span were obtained with deferent stiffened panel. Then horizontal low cyclic loading were carried out in the lab. Based on the test results of these three specimens, the damage process, damage mode, the bearing capacity, the displacement behavior, the hysteretic behavior, the dissipation energy capacity and the stiffness degradation are investigated. The influence on the seismic behavior of the specimen with unstiffened panel, cross stiffened panel and diagonal stiffened panel are compared. Based on the measurement result of the strain, the percentage of the shear force and the overturning moment which loaded on the steel frame and the shear walls are calculated for the three specimens. In addition, the axial force and moment at the two ends of the beam are also obtained. Thus the mechanics mechanism of the structure as a dual resistance system are validated.Finite element models of the three specimens were built based on shell element and inclined tension strips model by use of software ABAQUS and SAP2000, respectively. The damage process, the damage mode, the bearing capacity and the displacement behavior of the three specimens are obtained. The influence of the stiffener on the tension straps and the hinges are analyzed. By comparing the simulation results and the test results, the validity of the finite element method were gained, which provides a good process to analyze the seismic performance of the steel frame-steel plate shear wall system.A seismic design process, which based on the capacity of the steel plate shear wall was provided. In the design process, the shear capacity of the steel plate shear wall was calculated by the equation prescribed by AISC; the finite element model was built by inclined tension strips model; the damage procedure and damage mode were obtained by Pushover analysis; the final structure is determined by judging whether the damage procedure or the damage mode are reasonable or not. Examples are exhibited to validate the seismic design method.Based on the incremental dynamic analysis method(IDA), the process to calculate the structural influencing coefficient and deflection amplification factor of the steel frame-steel plate shear wall system are provided. In the process, the steel plate shear wall was simulated by inclined tension strips model; the finite element model was built by software SAP2000 and the earthquake waves were selected by a certain criterion. Then non-linear time history analysis was conducted for six plan steel frame-steel plate shear wall structure, which were designed based on the capacity of the steel plate shear wall. Then the structural influencing coefficient and deflection amplification factor are calculated. In addition, the influence of the number of story and the span on the two coefficients are analyzed. Finally the suggestion values of the two coefficients are given for the steel frame-steel plate shear wall structures with unstiffened welded-bolted connections.