Analysis Of The Resistance To Continuous Collapse Of The Tensile Structural Method In A Multi-layer Steel Frame Structure

At present,the design of multi-storey steel frame structure under normal load has been mature,but in the accidental loads,if the structure occurrence of local damage,the whole structure is easy to collapse,causing huge casualties and property losses.In view of the existing steel frame progressive collapse of common design method is drawing structure method,however,the current steel frame progressive collapse resistance study,the collapse resistance of drawing structure a section and a strength so the contrast of different section types and different tensile strength structure to resist collapse ability,provide some reference to the anti collapse design of steel frame structure and subsequent pull.The main contents and conclusions of this paper are as follows:(1)on the performance of steel frame structure progressive collapse analysis using SAP2000 software,the component removal was evaluated after column collapse resistance of the internal steel frame structure in the short side to remove the corner column,short side of the column,long side of the column,the internal column,on a 5 storey steel frame structure,found in the same load,the extent of damage from large to small:corner damage,short side column damage,long side column damage,internal column damage,found on the failure column chart and the speed of the vertex displacement time history diagram analysis,general failure column vertices down at first increases suddenly,do a vibration attenuation,around a final the position on the vibration,the final speed tends to O,the final displacement value to a stable value;(2)When the frame structure is used for the collapse design of the bracing structure,The tensile structure method can significantly increase the collapse resistance of structures,minimum section support steel increased by 0.71%,the largest decline in the rate of decrease of the displacement value of Dmax reached 56.434%,The reduction rate of the stable displacement value Dt=20.5 is 62.16%and the maximum speed Vmax is reduced by up to 29.67%;(3)Comparative analysis of 1 section of the tensile strength of the structure of the 10 sections,and with section increases,by increasing the amount of steel,increase the collapse resistance of the structure,but the growth trend tends to be gentle;(4)comparative analysis of drawing structure collapse resistance of the 3 kinds of section form,from high to low:H-shaped steel,steel tube,angle steel,in drawing structure anti collapse design,considering the reasonable economic situation,recommended by H-shaped steel;(5)comparative analysis of drawing structure collapse resistance of the steel tube and the angle,we can get the corner column failure,steel pipe,a maximum speed of Vmax was significantly decreased than the angle of the maximum speed of Vmax,the value of Dmax,and the maximum displacement value is stable down displacement Dt=2.0s are smaller than the angle,short side of the column and long side of the column failure,the largest decline in the value of displacement of the steel tube Dmax,stable displacement value Dt=20.s and the maximum speed of Vmax has decreased,but not significantly reduced jiaozhu;(6)Comparative analysis of collapse resistance of H-shaped steel and steel pipe,we can get in the corner failure,short side of the column failure and long side of the column failure in 3 cases,H-shaped type steel anti collapse ability are stronger than steel tube,increase in steel consumption rate is small,the largest decline displacement Dmax,stable displacement value Dt=2.0s and the maximum velocity of Vmax are less than that of the steel tube.