| With the accelerated transformation of urbanization and the development needs of green prefabricated buildings,steel structure residential buildings have become an important development direction in the field of prefabricated buildings.The large size of beam and column components in traditional steel structure residential buildings leads to convex beam and convex column.The scheme of square steel tube bundle or implicit frame usually has problems such as large steel consumption and complicated construction.In this paper,a more economical and effective method is adopted.By using the flexibility of two-way stiffness adjustment of steel special-shaped columns and the high elastic-plastic buckling load characteristics of corrugated steel plates,a new steel special-shaped column-corrugated steel plate shear wall system,referred to as SC-CPSW,is proposed to solve the problem of convex beam and convex column in steel structure residential buildings and the defect of insufficient lateral stiffness of high-rise steel frame.In this paper,the force transfer mechanism and seismic performance of SC-CPSW structure under lateral load are studied by numerical simulation and theoretical analysis.The main research contents and results are as follows :(1)According to the model calculation of YJK software and the theoretical specification,the design and selection of SC-CPSW structure are carried out.A single-span and double-layer SC-CPSW finite element model is established to study the force transmission mechanism and seismic performance of the special-shaped frame and embedded steel plate under lateral load.The calculation results show that the SC-CPSW structure mainly relies on the shear yield of the embedded corrugated steel plate to bear the lateral load.The shear force is caused by the shear effect of the corrugated steel plate and the lateral displacement effect of the special-shaped frame.The failure mode conforms to the design concept that the embedded steel plate yields before the frame beam and column under the dual lateral resistance system.Based on the analysis of shear buckling of corrugated steel plate and shear bearing capacity of steel specialshaped column,the calculation formula of bearing capacity and lateral stiffness of SC-CPSW structure is obtained.(2)Four series of 28 finite element models were established by ABAQUS finite element software to study the influence of axial compression ratio,shear span ratio,steel plate thickness,steel special-shaped column type and arrangement on the seismic performance of the structure.The results show that the increase of the axial compression ratio decreases the anchoring effect of the special-shaped frame on the embedded steel plate,which leads to the decrease of the lateral bearing capacity of the structure in the strength degradation stage.The decrease of shear span ratio is beneficial to improve the stiffness and bearing capacity of the structure,but it will reduce its energy dissipation capacity and deformation capacity.Considering the ductility of the structure,the shear span ratio should be controlled at about 1.25.The thickness of the embedded steel plate plays a decisive role in the bearing capacity and initial stiffness of the structure.However,considering the ductility and energy dissipation capacity,the thickness of the steel plate should be 3mm-5mm.The structure with cross-shaped special-shaped columns has better plastic deformation ability than that with L-shaped and T-shaped special-shaped columns.The arrangement direction of eccentric limbs of steel special-shaped columns has a significant influence on the structural performance,and the eccentric limbs should be arranged along the in-plane direction of shear wall.(3)Considering the equivalent theoretical calculation model of lateral stiffness and bearing capacity,the embedded corrugated steel plate is simplified as equivalent cross support;through MIDAS GEN finite element software,the modal analysis,response spectrum analysis and dynamic elastic-plastic time history analysis of the high-rise steel structure residential model with SC-CPSW structure are carried out.The results show that the yield mechanism of the structure under earthquake action is that the embedded steel plate(equivalent support)yields first;the SC-CPSW structure effectively increases the overall lateral stiffness of the model and inhibits the overall torsion of the model. |
PDF Full Text Request