Research On Seismic Performance Of Prestressed Cable-RC Frame Structure System

As an excellent structural member,cable can increase the lateral stiffness,increase the ultimate bearing capacity,increase the energy consumption of the structure,and improve the failure mode in terms of structural performance.During construction,the cable features such advantages as light weight,diverse materials,easy maintenance and replacement.The cable is easy to repair and replace,after the earthquake,this replaceable structural member can quickly restore the function of the structure.Reasonable design can improve the structure to the design level of "be elastic under minor earthquake,undamaged under moderate earthquake,and repairable under strong earthquake".In practical applications,cable,as a lightweight and high-strength material,has been widely used in large-span space structures such as bridges and public buildings.Meanwhile,cables are applied to structural reinforcement due to the advantages of external prestressing.In this paper,the cable is applied to the civil structures in view of its excellent performances,and proposes a new type of prestressed cable-RC frame structure.This paper analyzes the application status and related specifications of cable,summarizes the research status of earthquake resilient structure and self-centering frames,and studied the hysteretic behavior of a planar element by a general FEM analysis software ANSYS.By changing the sectional area and prestress of the cable,the energy dissipation and self-centering characteristics of the prestressed cable-RC frame structure are obtained.The impact of the cable on the seismic performance of the structure was studied.A nine-layer frame structure and a prestressed cable-RC frame structure were designed using the performance-based design method and the response spectrum analysis under minor earthquake was performed.The nonlinear elasto-plastic time history analysis of moderate earthquake and strong earthquake were conducted to study the lateral displacement,story shear force,distribution of shear forces,and the development of plastic hinges of beams and columns.The excellent seismic performance of this new structural system was verified.The correlation between the layer displacement angle and the cable bearing shear force was deduced and fitted.And the internal forces of the cables under the action of each seismic wave were extracted and analyzed.An engineering case close to few wall frame was analyzed to compare the integral calculation index and economics of a few wall frame,a steel support-frame structure,a prestressed cable-RC frame.The superiority of prestressed cable-RC frame structure compared with the few wall frame structure and steel bracing-concrete frame structure was analyzed.Some patents developed by the joint construction method for the framework structure provide technical conditions for the application of this system.There are some cable and frame structure connections that provide technical conditions for the application of this system.The research shows that the structure achieves the seismic fortification goal of" be elastic under minor earthquake,undamaged under moderate earthquake,and repairable under strong earthquake",and the prestressed cable adds a seismic fortification line.At the same time,according to the calculation of inter-story shear distribution,the correlation between the ratio of shear load and the displacement angle is proposed,which provides a reference for the reasonable layout of cables.Prestressed cable-RC frame structure has good practical application meaning.