Experimental Study On Seismic Behavior Of Interior Joints Of Integrally Fabricated Steel Reinforced Concrete Frame

Integrally fabricated method can be applied in Steel Reinforced Concrete (SRC)frame construction, which means that concrete beam and column with section-steelreinforced after prefabrication in factory are connected with high strength friction gripbolt, welding and concrete pouring secondly. This convenient method can acceleratethe building progress and ensure the seismic performance of construction withoutlowering its integrity.Joint with dog-bone type weakening, which flange on the beam near the corearea is weakened like a dog-bone to cut down its bending strength, is a modern typeused in steel structure. Under earthquake this kind of joint can make certain that theplastic hinge not appear on the interior area, but on the weakening beam with goodductility, so as to protect the core. In this paper, the experiments of the integrally fabricated SRC frame withdog-bone type weakening are performed in order to examine the performance of thistype of joint with the two kinds of technology mentioned above. Following researchesare accomplished in this paper:(1) The seismic behavior of 2 interior joints, one is the ordinary joint and theother is the joint with dog-bone type weakening, of the integrally fabricated SRCframe under the asymmetrical cyclic loading is investigated and compared in detail.(2) According to the failure pattern, the resistant mechanism and the failurereasons of the joints are analyzed.(3) The ways to strengthen the interior area and to improve the seismic behaviorare also put forward based on non-linear finite element analysis, so as to ensure thefunction of the dog-bone. Finally conclusions are drawn as follows:(1) Integrally fabricated connection between beam and column does not lowerthe strength and the rigidity of Interior Joints of Integrally Fabricated SRC Frame.(2)The seismic performance, including the ductility and energy dissipationcapacity of the SRC joint with dog-bone type weakening is clearly superior to that ofthe ordinary SRC joint, if only the shear strength of the interior area is enough.