Security Analysis Of Concrete-filled Steel Tubular Moment-resistant Frame Based On Hybrid Yield Mechanism

Concrete-filled Steel Tubular Moment-resistant Frame is a new kind of structural systems, because of its excellent high strength, seismic behavior, great economic benefits and other advantages, more and more high-rise and wide-span buildings widely apply it. On the other hand, the study of Concrete-filled Steel Tubular Moment-resistant Frame mostly concentrates on the mechanical behavior of basic members rather than the performance of whole Concrete-filled Steel Tubular Moment-resistant Frame."Strong column and weak beam" is the traditional understanding of rational structure yield mechanism to ensure the structure's seismic safety in framework. At present, there are no special researches on Concrete-filled Steel Tubular column's yield mechanism, generally applied to the beam hinge yield mechanism for seismic design of steel structure. The project broke through the traditional frame construction of the beam yield hinge mechanism model, based on the layer column-to-beam strength ratio's conception, proposed a new Moment-resistant Frame of hybrid yield mechanism which a part of columns are permitted to generate hinge. This structure, use the superior performance of Concrete-filled Steel Tubular columns after yielding no significant capacity to reduce, allow the plastic deformation occurred on some of Concrete-filled Steel Tubular columns, effectively absorb seismic energy, ease the end of the beam's plastic deformation, Thus enables the structure earthquake resistance ability to obtain the display maximum limit.In order to realize the new Concrete-filled Steel Tubular Moment-resistant Frame of hybrid yield mechanism's safety, in the present review, adequately summarize the existing researches in this area, studied the minimum layer column-to-beam strength ratio to guarantee the new Concrete-filled Steel Tubular Moment-resistant Frame of hybrid yield mechanism's safety on the different earthquake strength, and evaluated the structure's safety performance.Firstly, on the basis of the analysis of concrete-filled steel tube theory, Concrete-filled Steel Tubular Moment-resistant Frame of dynamic performance testing and Concrete-filled Steel Tubular Moment-resistant Frame finite element dynamic analysis of researches status at home and abroad, discussed the possibility of realization of Concrete-filled Steel Tubular Moment-resistant Frame with hybrid yield mechanism.Secondly, give the definition of the layer column-to-beam strength ratio, and based on the layer column-to-beam strength ratio's conception and the particular design method of building Concrete-filled Steel Tubular Moment-resistant Frame of hybrid yield mechanism which part of columns were permitted to yield was given.Thirdly, adopt the non-linear dynamic time-history method to analyze the multilayer Concrete-filled Steel Tubular Moment-resistant Frame of hybrid yield mechanism, received the nonlinear response of different time under strong earthquake; studied the maximum deformation of yielding columns and the degree of structural accumulative damage deformation; verified the injuries of the yield columns. The results show that the layer column-to-beam strength ratio with great significance to the framework of the formation mechanism and structural safety.The Concrete-filled Steel Tubular Moment-resistant Frame of hybrid yield mechanism, make full use of the good mechanical properties and seismic behavior of Concrete-filled Steel Tube, so that the Concrete-filled Steel Tubular Moment-resistant Frame design is more security, economic and rational, with the more important academic significance and wide engineering application prospect.