Study On The Interference Frequency Analysis Of Flexible Cable-regional Confined Concrete Frame

In the aseismic design of building structures,the lateral stiffness of shear walls is usually large when the limit value of axial compression ratio is met.In view of this,a new structural form of flexible cable regional confined concrete frame is proposed,which combines the high ductility structural form of regional confined concrete frame with flexible cable,so as to provide a new aseismic structure with moderate lateral stiffness,and then change the structure The natural frequency of the structure can be used to improve the seismic performance of the structure.In this paper,the software ABAQUS is used to analyze its seismic performance,and the following work is done specifically:(1)The modal frequency changes of three types of RCCK0?RCCK1 and RCCK2 analyzed and compared,the feasibility of the interference frequency design of flexible cable frame structure is put forward.(2)The seismic response of frame,cable frame and diagonal braced frame are compared and analyzed to study the seismic performance of cable frame structure.The results show that:(1)Under the same condition,the frequency of frame with diagonal brace is always the highest,while that with flexible cable is the lowest,and the frequency of flexible cable frame is very low in the initial stage of vibration,It is a horizontal line,but there is no difference between the later frequency change trend and the other two kinds of frames.Through the observation of the structural vibration mode,it is found that the vibration mode of this part is mainly the out of plane vibration of the cable,which is quite different from that of the other two kinds of structures.Through the data,it is found that the natural frequency of the structure almost has no obvious change when the pretension is applied.The conclusion from the perspective of modal displacement is that The relationship between the movement amplitude of the structure direction(span direction)is as follows:Frame is the first,next is Diagonal brace frame,the last is Flexible cable frame;It can be seen that the flexible cable structure has high feasibilityin frequency interference.(2)The addition of flexible cable has a great influence on the dynamic response of the structure,which shortens the duration of peak displacement of the structure response,reduces the amplitude of the structure under the same dynamic load,and is beneficial to the safety of the structure;meanwhile,the lateral displacement of the structure has been significantly reduced,with a maximum reduction of 56.83%,but the pretension of the flexible cable has a little influence on the interlayer displacement,and the connection area appears the stress The phenomenon of force concentration and "shear jump" occurs in the time history of shear force;the tension of flexible cable should be moderate to avoid local plastic damage of the structure.