Finite Element Analysis For Combination Of High Strength Steel Single Layer Single Span D-EBF Mechanical Performance

High strength steel combination D-type eccentrically braced frame is a newstructural typology which inherits the capability of resisting lateral deformation of CBF,the good ductility of moment resisting frame, the strength of high strength steel and theexcellent energy dissipation capacity of EBF. But now the domestic study on theseismic performance of this structure is very rare.In this paper, five kinds of finite models were setted up by using the software ofABAQUS to study the seismic performance of this structure. The five parameters arethe length of link beam, heightness-to-thickness ration of web, depth-to-span ration, thedistance of stiffening rib of web, depth-to-span ration and the combination of differentsteels. Those finite models were applied with monotonic loading and cyclic loading toobtain the load-displacement curve, hysteresis loop, skeleton curve and the curve ofstiffness degradation. And after the contrastive analysis, the varying patterns of thebearing capacity, the stiffness, ductility, and energy dissipation capacity of high strengthsteel combination D-type eccentrically braced frame are indicated.The results show that: the seismic performance of the structure of shear yield typeis better than the structure of the bending yield type, and the reasonable range of thelength of link is (0.70~1.20)Mp/Vp; When the heightness-to-thickness ration of webdecreases, the bearing capacity and initial stiffness of structure increases, but theductility and the energy dissipation capacity are weakened, and the same timeheightness-to-thickness ration of web should not be less than21.7; When the distance of stiffening rib of web increases, the ductility of the structure gradually increases, thebearing capacity of the structure gradually decreases, but the rate is verysmall, and the initial stiffness of the structure is not affected; When the range of thedepth-to-span ratio of the structure is in0.55~0.80, the structure bearingcapacity, stiffness, ductility, deformation capacity and energy dissipation capacity canbe fully played; Accompanied with the increase of the combined steel, the ultimatebearing capacity of the structure and the energy dissipation capacity is enhanced, theductility of the structure is weakened, but the initial stiffness of the structure is almostnot effected. All in all, using the high strength steel of the combination (the link and thebrace keep using Q345steel) has obvious advantages over the bearing capacityand energy dissipation capacity of the structure, but the the ductility of the structure isweakened.