Research On Mechanical Performance Of Assembled Concrete Beam-Column Joints And Frames With Bolt Connections With Corbels

Prefabricated buildings are rapidly rising in the domestic market.Because of its green,efficient and energy-saving features,it is strongly supported by the state.During the "Twelfth Five-Year Plan" and "Thirteenth Five-Year Plan" period,major projects such as prefabricated buildings,green buildings,and industrialization of buildings were all involved.Coupled with today’s labor shortage,environmental pollution is increasing.The study of prefabricated buildings is the key to the transformation and upgrading of China’s construction industry.In this paper,the mechanical properties of prefabricated concrete beam-column joints and frames with bolts connected with corbels are studied.The main work is as follows:1)Taking the experiment of R.Vidjea et al as a reference,the beam-column node of the PD-SS scale in the experiment is modeled and analyzed to verify the feasibility of the finite element research method.Considering that the reference node is a scale node,there is a lack of practical engineering significance.According to the actual project size,it is enlarged on the basis of the reduced-scale node to obtain a full-scale node.By comparing the results of the finite element analysis of the reduced-scale and full-scale nodes,it is verified that the reduced-scale and full-scale nodes have consistent mechanical properties.2)Based on the full-scale node finite element model,the parameters of the nodes are analyzed.By changing the parameters of each component in the node area,the first component in the node area that reaches the ultimate bearing capacity is analyzed,and different types of damage are distinguished according to the damaged component.Through the comparative analysis of various types of failure,the ideal failure mode of the node area and the node design method of the ideal failure mode are proposed to provide a basis for the establishment of the subsequent assembly frame.3)Analysis of the mechanical performance of ordinary frames and assembly frames.First,design a common plane frame as the basis of frame modeling.Taking ordinary plane frame nodes for low-cycle reciprocating load analysis,the bending capacity of ordinary nodes is obtained.According to the assembly node design method of ideal failure mode,the assembly node is designed and modeled and analyzed to verify that the failure type of the node is the ideal failure mode of bending the beam end.At the joints of cast-in-situ frames,the principle of equal bending moments is adopted,and the joints are replaced by assembly nodes to obtain common frame and assembly frame models.The same unidirectional load is applied to the two frame models to obtain the difference in the mechanical performance of the two frames,which provides a reference for practical engineering applications.