Study On Precast Concrete Frame Structural Dry Joint

Full prefabricated concrete frame structure has the advantages of short construction period,high product quality,low energy consumption,and low environmental pollution,besides,it’s an inevitable choice for realizing the development of green building industrialization.However,the reliability of the dry node connection of the prefabricated frame structure is relatively poor,so the application of the prefabricated frame structure in an earthquake-resistant area is limited.At the same time,the theoretical research of the efficient prefabricated frame dry node connection is also lagging behind.The advantages and disadvantages of various dry node connections are compared,and the ideas of several new dry node connections are improved and proposed by the performance analysis of the various connection methods used in the prefabricated frame structure in the actual project Based on this,this paper combines the relevant experimental data,using the method of theoretical analysis and finite element analysis to analyze the performance of the new fully-fabricated frame dry joints.The main research contents and some conclusions of this article are as follows:1)Based on the summarization of existing connections of prefabricated frame joints at home and abroad,this paper proposes several new rigid dry joints with better rigidity are proposed after optimizing and improving the existing flanged joints.The structural characteristics and stress performance of the qualitative analysis.2)Analyze the overall stress of the new dry-type joints,and analyze the embedded parts in the new dry-type joints.The design check formula for the embedded anchorages were given;Force calculation formula were given by theoretical analysis of the load of the new dry joints.3)The ABAQUS finite element model of the new dry node and cast-in-situ node under the same conditions was established respectively,and the proposed formula was verified;the mechanical performance of the new dry joint was explored and the bottom shear method was used to simulate the seismic force effect.The qualitative analysis influence was established.The seismic reliability of the new dry joints was analyzed and parameters were analyzed in order to optimize the structure.4)The analysis results of ABAQUS finite element show that the load capacity of the prefabricated member jointed with the new dry joint is the same as that of the cast-in-place member under the same conditions,and all have good ductility.5)For the new column-column dry joints,it is recommended that the number of bolts should not be less than 8 at design time.At the same time,the thickness of the flange plate and the embedded plate should not be less than 20 mm.The thickness of the stiffening plate should not be less than 10 mm and should not be less than 1/15 of the extension width.when the axial pressure ratio is 0.5,the column-column splice node is the best.6)For the new beam-column dry joints,it is recommended that at least four rows of bolts should be arranged in the joint area at design time.The bolts should be close to the tension side and the bolts should not be less than 10,as well as the thickness of flange plates and embedded plates.Should not be less than 20 mm,the stiffener thickness should not be less than 10 mm and should not be less than 1/15 of the extension width.