Analysis Of Dynamic Characteristic Of Steel Frame-composite Shear Wall Structure

As a new type of infill wall resistant structure, steel frame-composite shear wall issuitable for high-rise building especially. Composite shear wall limits outside deformation ofsteel plate by using bolts to connect concrete covers on both sides and the embedded steelplate, so that the structure can play its ductility and energy-dissipating capacity to make itperformance better seismic ability. At present, the domestic and international research ofSCSW structure has achieved initial results, static pushover analysis has been more mature,but study of dynamic performance has just started. Therefore studying the dynamiccharacteristics of SCSW structure has theoretical meaning.In this paper, simplified models of semi-rigid steel frame-composite shear wall and steelframe-steel plate shear wall are established by using the finite element analysis softwareANSYS12.0, and the rationality of simplified models are verified by relevant tests. Thendesigned a twenty-floor steel frame shear wall structure, selected one common SCSWstructure to establish the basic finite element model(BASE model). Based on the BASE model,established total eighteen models of three series, in which, including three factors, such asembedded wall type, embedded steel plate thickness, joint stiffness, are considered. For thesemodels mentioned above, this paper carried on modal analysis, response spectrum analysisand time history analysis, through modal analysis mainly discussed the changes of structuralvibration period, through response spectrum analysis mainly discussed the changes of floordisplacement, angle of floor displacement and base shear under frequent earthquake, throughtime history analysis mainly discussed the changes of floor displacement, acceleration andinternal force under severe earthquake.The results show that, compared with traditional steel frame structure, the naturalvibration period of SCSW structure reduces significantly, the floor displacement and the angleof floor displacement all decrease while the base shear increases under frequent and severeearthquake; the natural vibration periods of SCSW structure and steel frame-steel plate shearwall have no much difference, and dynamic responses under frequent earthquake are verysimilar, but under severe earthquake the SCSW structure performance better seismic ability.In the range of thin steel plate, with plate thickness increasing, the elastic lateral stiffness of SCSW structure improves little, the natural vibration period, floor displacement and baseshear under the frequent earthquake have almost no change, while under severe earthquake,the steel plate is more thicker, the yieldness is more later, dynamic responses of the structureare more unfavorable to resist earthquake. With the increase of joint stiffness, the lateralstiffness of SCSW structure improves, and the natural vibration period decreases, SCSWstructures which adopt moderate joint stiffness show more excellent dynamic performancethan those structures whose joint are hinged or rigid under the frequent and severe earthquake.The application of SCSW structure is very wide. This paper analyzes the factors thatinfluence the dynamic characteristics of SCSW structure from different aspects, and providesthe reference for further theoretical investigation and practical application.