The Performance of Hybrid R/C-Steel Structures under Successive Earthquakes

In the conventional building procedure, numerous circumstances may be discovered regarding building types composed of a lower and older reinforced concrete (r/c) component and an upper and newer steel part, referred to as a "hybrid" building. Established principles of seismic design provide comprehensive instructions for the resistant design of structures built using a single material everywhere. The present seismic norms do not give explicit design and detailing requirements for vertical hybrid structures. There needs to be more investigation in existing research, addressing thisscientific gap. The current study attempts to fill this knowledge gap on hybrid construction performance under successive ground motions, which have been reported in research worldwide in terms of seismic structural performance. Three-dimensional representations of hybrid r/c-steel building frames are subjected to successive ground stimulations across the horizontal and vertical directions, implementing a non-linear response of the frame components over time. The bottom r/c part of the hybrid structures is described as relating to a previous construction using an essential approximation here. Furthermore, two limit interconnections of the structural steel component to the concrete one are identified for investigation in non-linear time history analysis. An evaluation of the arithmetic analysis outcomes of the hybrid frames considering the two limit interconnections is performed. The analysis diagrams of the present dynamic investigations of the 3D hybrid frames exposed to successive ground motions provide helpful insights that offer guidelines for a better earthquake-resistant design of the “hybrid” building form, which does not fall within the scope of the present standards despite being frequently used.