| Prefabricated assembly integral frame structure is an effective way to realize the industrialization of construction.This kind of structure form not only has the advantages of the cast in place structure and the whole prefabricated assembly structure.In addition,it has the advantages of high construction efficiency,good economic efficiency,energy saving,environmental protection,etc.which has been concerned by more and more owners and designers.Precast monolithic frame structure of the key is characterized in that the frame beam column joints are connected,but the assembled integral type frame structure of dry node connection poor reliability,the precast assembled integral type frame structure widely used in seismic regions is restricted.At the same time,the theoretical study of the high efficiency prefabricated assembly integrated frame dry connection is still relatively backwardIn this paper,the experimental data related to the topic of new prefabricated frame structure of steel reinforced concrete joints mechanical properties of research and analysis by the finite element analysis method.Based on practical engineering has been used more prefabricated frame structure using a variety of connection mode of performance analysis,comparison of all kinds of dry connection strengths and weaknesses,and puts forward the idea of new prefabricated frame structure,steel reinforced concrete(SRC)node.Yield outside the area take full advantage of the thought is the core of the new assembly frame type steel reinforced concrete composite joints connecting structure beam column node connecting the core at the end of the beam plastic hinge zone ductility capacity through in the plastic hinge region component of reasonable structural design,the beam load is transmitted to the beam end plastic hinge zone,plastic hinge zone to consume a portion of the seismic energy,delay beam column joint core zone of stress and failure process,that is,when an earthquake occurs,beam plastic hinge zone can act as a "fuse",slow earthquake effect on joint core area of the impact of beam to column connection core area to "protect".The finite element analysis software ABAQUS three edge node model are established,respectively is:steel reinforced concrete joints,ordinary reinforced concrete joints and new steel reinforced concrete joints;three medium node model,respectively is:steel reinforced concrete joints,ordinary reinforced concrete joints and new steel reinforced concrete joints;three two spans,three floors of a pin frame analysis model are:ordinary reinforced concrete frame and steel reinforced concrete frame and the new node is composed of steel reinforced concrete frame.Through the comparison of various models of lag back curve,skeleton curve,ductility energy dissipation capacity,strength degradation and stiffness degradation parameters,a comprehensive analysis of the seismic performance of the new assembly type frame structure,steel reinforced concrete(SRC)node.Through comparative analysis of structure or component of lag back curve,skeleton curve,ductility energy dissipation capacity,strength degradation and stiffness degradation and other parameters,a comprehensive analysis of the seismic performance of the new assembly type frame structure,steel reinforced concrete(SRC)node.The results show that the ductility and deformation capacity of the new joint are better than that of ordinary joints under the condition that the bearing capacity of the new joint is equal to that of the common node under the same working condition.Therefore,the new node is proposed in this paper for strong nodes by of beam end plastic hinge region and reasonable structural design,can make full use of the plastic hinge regions of the energy dissipation capacity and improve the node deformation capacity and seismic performance. |
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