Study On Seismic Behavior Of High Strength Steel Composite Y-eccentrically Braced Steel Frames On Remote Collaborative Hybrid Test

High strength steel composite Y-shaped eccentrically braced steel frame（HSS-Y-EBF）is a kind of double lateral force resisting structure system based on damage control concept.Steel with lower yield point（such as Q235,Q355）is used for shear link section,and steel with higher yield point（such as Q460）is used for other members of structure,which reflects the high bearing capacity of high-strength steel and good seismic performance of eccentric brace.Considering the limitations of the traditional test methods,the seismic performance of HSS-Y-EBF with multi-storey and multi span was studied by using the new method of remote cooperative substructure hybrid test.The main contents are as follows:（1）The remote collaborative hybrid test method of selecting two test substructures from HSS-Y-EBF with multi-storey and multi span was introduced.The main research contents include the numerical modeling method of Open Sees Navigator,the parameter setting of OpenFresco platform,and the establishment of the global model of remote collaborative hybrid test.（2）The structure was basically undamaged under the action of small earthquakes,the stiffness degradation was not obvious,and the strain at the measuring point of each component did not reach the yield value.During the action of the earthquakes with seldom intensity,the shear link section was dominated by shear deformation and it was given priority to enter the yielding state as the first seismic line of defense to consume seismic energy.At the same time,the shear link section had not undergone extreme damage under the action of the 9-degree Taft seismic wave rare earthquake,and the global frame was in the elastic stage except for the shear link section,which indicates that HSS-Y-EBF adapts to the design concept of damage controllable and dual lateral force system.（3）The global numerical model of remote collaborative hybrid test was established by using Open Sees.The validity of the simplified numerical modeling method was verified from the acceleration time history curve of the global model,the maximum displacement error and shear peak error.The incremental dynamic analysis of the prototype structure shows that the structure is basically in undamaged state under frequent intensity earthquake.Whenθ_max of 2%is taken as the evaluation parameter of structure collapse,the prototype structure cannot collapse under the action of an earthquake with seldom 8 intensity,which indicates that it has enough safety reserve.In addition,the design of HSS-Y-EBF prototype structure is relatively conservative refer to Chinese codes of the limit value of interlayer displacement angle.