偏心支撑框架具有较高的强度和刚度，在循环荷载作用下的非弹性性能仅被限制在耗能梁段发生，耗能梁段能发生较大的塑性变形而保持稳定，从而吸收和耗散大量的能量，延长结构抗震能力的持续时间。在有些情况下，异种钢焊接构件能满足复杂受力要求。因此采用焊接方法制造的异种钢结构部件逐渐受到人们的广泛重视，进一步研究异种钢K型偏心支撑钢框架的受力性能具有重要意义。 本文利用ANSYS软件对异种钢K型偏心支撑钢框架的整体受力性能进行了研究。通过对4个系列共21个试件的计算与分析，主要研究了耗能梁段的长度、耗能梁段腹板的厚度、框架的高跨比、不同钢材强度等级等参数对K型偏心支撑钢框架整体抗震性能的影响，得到的主要结论为：剪切屈服型耗能梁段腹板受力较均匀，耗能梁段腹板可以形成多个塑性铰，有利于结构的耗能，剪切屈服型结构抗震性能要优于弯曲屈服型结构；耗能梁段的长度在范围内取值时，偏心支撑钢框架的整体抗震性能最优；高跨比较小的结构，承载力与刚度较大，而延性与耗能性能相对较差，高跨比较大的结构则反之，框架的高跨比宜控制在的范围内；腹板的高厚比在一定范围内增加可以提高结构的刚度、承载力，但腹板厚度超过一定范围会造成钢材浪费，在设计时建议腹板的高厚比不宜小于22；不同强度等级钢材组合对异种钢K型偏心支撑钢框架的受力性能有一定的影响，异种钢K型偏心支撑钢框架和普通K型偏心支撑钢框架比较，可以得出前者的承载力和耗能性能要优于后者，只改变支撑的钢材强度时，只要支撑不发生屈服，结构的受力性能改变不大。 本文深入地分析了异种钢K型偏心支撑钢框架在单向荷载和循环荷载作用下的受力性能，得出的结论对异种钢K型偏心支撑钢框架的理论研究和工程应用具有一定的参考价值，也为进一步研究其它类型的异种钢偏心支撑钢框架的抗震性能打下了良好的基础。

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 has certain 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.