Application Research On Seismic Performance Of Steel Frame Structure With Vertical Seams Filler Wall

Steel structure has many advantages, such as the good ductility, the excellent seismic performance, the light weight, the high strength, the short construction period and high degree of industrialization, etc. As the green energy-saving building is promoted in recent years, steel structure housing is rising step by step. Filler wall as the maintenance of structural components are indispensable in frame structure buildings. Currently the academic research on energy dissipation of filler wall in steel structure frame is relatively rare. Filler wall in structural system do not bear loading directly in traditional calculation, only to play a role as enclosure protection and segmentation of the room, ignoring the beneficial effects and the adverse effects of the wall to the structure. In addition to maintenance and segmentation of the filler wall, from the perspective of the structure, when the frame is under horizontal force, there is composite action between steel structure and filler wall. However, filler wall has a big influence on the bearing capacity and lateral stiffness of structure, it is caused more and more people’s attention to the seismic safety of the structures.Actually filler wall frame in addition to have the effect of maintenance and separate room, from the perspective of the structure when the frame under horizontal force, the combination of the steel frame and filler wall both have obvious stress, and filler wall has a greater influence on the lateral stiffness of structure. As the requirement of structure reliability is increasing, people should pay more attention to the seismic performance of structure components. According to this problem, a new type of energy dissipation filler wall measure has been proposed, through setting the vertical seam in the filler wall to make the stiffness degraded quickly under strong earthquakes, so as to reduce the interaction of filler wall and steel frame and delay the destruction time of the filler wall to make the structure have a certain energy consumption. This measure can reduce the response of the structure under seismic action and prevent filler wall structural elements such as the serious destruction from premature destroying. Three models are established as rigid connection frame, flexible connection frame and pure steel frame by the large finite element software of ABAQUS. There is a spring in vertical seam and it is used to simulate a tie bar. Each of these three models was simulated under uniaxial loading and low cycle repeated loading without axial pressure and axial compression stress ratio was 0.2. From these simulations, a series of models like displacement curve under monotonic loading, stiffness degradation curve, hysteresis curve and skeleton curve were extracted to analyze effects that were brought by these factors on seismic performance of structure.In order to further study the slotting numbers (monolithic wall height to width ratio) on structure seismic performance influence, change ratio of wall on the basis of the study. Then a series of models with joints were established as aspect ratio changed, compared with flexible connection model, rigid connection model and pure steel frame model, researched influence of the quantity of joint different aspect ratio on seismic performance of filler wall. From the research, it is believed that the change of quantity of joint and aspect ratio has a big influence on stiffness, bearing capacity and energy dissipation capability of structure. The more joints of a wall, the larger aspect ratio of a wall, the greater weakened of the stiffness of whole structure, the lower of bearing capacity of frame, the better of ductility and energy dissipation capability, but it should avoid excessive joints to weaken the stiffness too much, the lateral stiffness and bearing capacity of structure reduced significantly, and the wall was not able to resist the lateral. Then another two springs with connection stiffness were added to the joints of the four models, and studied the influence that different distances of tie bars in practical engineering brought to seismic performance of the models which had joints. It is believed that the increased spring stiffness has a significant influence on jointed models whose aspect ratio is less than 1.2. The greater the spring stiffness it is, the bearing capacity improves significantly. Three models are established as the slotting model and the model of rigid connection and flexible connection model to numerical analysis comparison.