Behavior Factor of Semi Precast RC Moment Resisting Frames with A Flexural Beam-Column Connection

Industrial Application of prefabricated reinforced concrete structures and the benefits it has been noted in recent years. Important advantage of precast industry is the production of precast segments in little time, low money and high quality. Due to some problems, the precast industry has not reached to its whole potential yet. The main problem is due to precast reinforced concrete connections. The behavior factor is an important parameter in linear analysis that indicates inelastic behaviors of structure such as over strength and ductility. In seismic codes, this factor is just written with a constant value. Considering the effect of precast concrete connection on the seismic performance of precast structure and factor such as period and ductility, behavior factor of these structures are different from cast in place one. So determining of this factor is necessary for these structures. In this research, the different types of semi precast moment resisting frames in different number of stories and bays with a Beam - Column Connection (connection used in Iranframeco Company) were investigated. In this research, nonlinear static analysis was used. The results indicate moment resisting frames with low stories (4 story) have behavior factor equally with cast in situ structures but for many more stories (8 story to up), behavior coefficient is more than equivalent cast in situ structure.