Experimental study on the seismic performance of steel–concrete beam–column connections for prefabricated concrete frames

Abstract

A novel type of prefabricated steel–concrete beam–column connection with different configurations for moment-resisting frames was developed for better constructability . Five beam–column connections, four prefabricated steel–concrete specimens, and one reference monolithic joint were tested under reversed cyclic load–displacement controlled conditions. The main variables were the steel form in beams and columns, fabrication method , and use of steel fiber reinforced concrete (SFRC) in the joint and connection parts. The cracking patterns and load–displacement hysteresis curves were recorded during the test. The efficiency of the developed connection was compared based on bearing capacity, energy dissipation , ductility, and stiffness. The results revealed that the prefabricated specimens with welded reinforcement connection exhibited flexural failure at the prefabricated beam, whereas the specimens with bolted end plates or weld-bolted H-steel beam connecting method failed through joint shear failure. The proposed prefabricated H-steel concrete connection with bolted end plates and SFRC had higher strengths and stiffnesses, more stable load–displacement cycles, and better energy dissipation capabilities. Moreover, the concrete spalling in the joint was adequately controlled, and shear deformation was also reduced. The H-steel beam connector in the proposed connection could effectively transfer loads under earthquakes. • A new prefabricated concrete beam–column connection connected with variable steel configurations is developed. • Cyclic loading tests performed on four prefabricated connections and one monolithic connection. • The prefabricated connection with welded reinforcements to H–steel flange fails in flexural failure. • Connections with bolted end plates or weld-bolted H-steel connection shows shear failure. • The prefabricated connections demonstrate satisfactory strength, stiffness and energy dissipation capacity.