Study On The Seismic Performance Of A New Type Of Fabricated Cold-formed Thin-wall Caved Steel Wall

As a member of cold-formed thin-walled steel composite wall,oblique braces are mainly used to resist vertical and horizontal loads.The bearing capacity of the composite wall decreases rapidly due to the existence of the hole which affects the integrity of the wall,so how to arrange the inclined support to make the composite wall to obtain the optimal bearing capacity is the main problem in the design of the composite wall.At present,most of the layout of the composite wall oblique support is directly given or enumerated,mixed with too many human factors,and some oblique support has not played a great use.Based on the actual stress condition of the composite wall,this paper optimizes the inclined support arrangement with reasonable stress by adopting the method of topology optimization,and it affords an idea and method for cold-formed thin-walled steel composite walls arranged in inclined supports.The research contents are as follows:1.A new structure form of cold-formed thin-walled steel composite wall is proposed.Under the load of three working conditions,through the topology optimization design,the structure layout of the new composite wall with more reasonable material distribution is given.2.Check the design and mechanical performance of the composite wall.Firstly,under the actual load,the section form and size of members are adjusted according to the equivalent stress,and the adjusted structure meets the requirements of strength and stiffness under the load.Secondly,the stability check is carried out,the slenderness ratio of the column is checked,and the component state and critical load of the new cold-formed thin-walled steel opening composite wall are obtained through buckling analysis.Under the premise that the external load does not exceed the critical load,the stability of the structure can be guaranteed.Then,through harmonic response analysis,the resonant frequency of the door wall and the external load is obtained.In the process of using the door wall,the external load of the same frequency should be avoided.When it is impossible to avoid,the displacement amplitude of the door wall at the resonant frequency can be reduced by placing dampers.Finally,through displacement control,the load displacement curves and hysteresis curves of the four composite walls are obtained.Through the linear analysis of the hysteresis curves of the composite walls,it can be seen that the seismic performance of the new composite wall is better.3.The application of new composite wall.The composite wall is simplified as an X-shaped double spring and placed in the frame to simulate the interaction between the composite wall and the frame.The main method is to convert the load displacement curve and hysteresis curve of the composite wall into the stiffness of the spring and carry out time-history analysis under the action of actual seismic waves.New composite wall was applied to the number of different floor cold-formed thin-walled steel structure residence,through seismic time history analysis,obtained the displacement of each layer and to calculate the corresponding relative displacement between floors,after the maximum relative displacement between layers was compared with the specification limits,the new composite wall,the applicable scope of the region in 8 degrees and intensity,the new type of composite wall with opening can be applied to the seven-story frame,and the building height is limited to 21m.