The Force Performance Analysis Of K—type Eccentrically Braced Frames Structure Combined With Dissimilar Steel

Eccentrically braced frame has high strength and stiffness. Under the cyclic load,inelastic performance are only limited in the links which can cause large plastic deformation and keep stability. It can absorb and consume large amounts of energy which can prolong the duration of the seismic ability. In some cases, dissimilar steel welding structure can satisfy the requirement of complex stress. Therefore, people pay more attention to the dissimilar steel structure components under the manufactured welding method. Therefore further research on the stress of the heterogeneous K shape eccentrically braced steel performance is of great significance.In this paper, by using ANSYS software for K — type eccentrically braced frames structure combined with dissimilar steel using entity modeling method for finite element numerical simulation analysis.Through the calculation and analysis of 21 species of 4series.The major parameters including links' length,thickness of links' web, ratio of rise to span, the combination of different steels and so on are studied. The main conclusions are:Type shear yield energy beam section of the web stress is relatively uniform, energy beam section of the web more plastic hinge can be formed, is advantageous to the structure of energy consumption, shear yield structure seismic performance is superior to bend the yield structure;The link's length which in the range of(0.9 ~ 1.24)can make the frame's whole seismic-resistant performance fully developed; The smaller ratio of the frame's height to span is, the larger its load-bearing capacity and rigidity, but the poorer its ductility and energy-dissipation. The larger ratio of the frame's height to span is converse. So the ratio should be restricted to(0.55~0.75); the web ratio of height to thickness ratio within a certain range can improve the stiffness of the structure and load-bearing capacity, but it will cause the waste of steel web thickness over a certain range. The design proposal of the web ratio of height to thickness ratio should not be less than 22;Different strength grade steel combination of dissimilar steel mechanical performance of K shape eccentrically braced steel frame hascertain influence, dissimilar steel K shape eccentrically braced steel frame and ordinary K shape eccentrically braced steel frame, can be concluded that the load-bearing capacity and energy dissipation performance is superior to the latter. Only the support strength of steel is changed, as long as the support not yield, the stress of the structure performance change is not big.The study analyzing the K—type eccentrically braced frames structure combined with dissimilar steel ' load-bearing performance in a rather comprehensive and systematic way, and the conclusion of the K—type eccentrically braced frames structure combined with dissimilar steel cross section the theoretical research and engineering application has a certain reference value, guiding design of engineering, and provide good basis for further study of seismic-resistant behavior of other types eccentrically braced steel frames combined with dissimilar steel.