The Performance Analysis On Laminated Prefabricated Column Base Joint

Compared with the cast-in-place concrete structure,prefabricated concrete structure has been widely applied in Chinese architectural field in recent years regarding its significant advantages in energy-saving and construction efficiency.However,the construction method of prefabricated building are factory precasting and field splicing,the connection of joints are critical to the performance of buildings in prefabricated structure.In view of this,this paper designs a laminated assembled beam-column connection structure.Combined laboratory test with simulation analysis,the author analyzes the structure over its mechanical properties,deformation characteristics and performance influence factors.Based on the results of the investigation,the following conclusions should be made.1.Since,the existing methods of connection emerge problems such as poor overall performance,weak connecting strength,and inefficient construction.Therefore,a kind of laminated prefabricated column base joint is proposed.Compared with the existing overlapped assembly structure,a series of connecting settings are added,including reinforced angel steel,steel body,convex set and basic anchor plate,to improve bearing performance and positioning accuracy.2.The indoor experimental plan as needed in which strain measuring point of test on structural performance is designed.The cast-in-place specimens and the laminated specimens are prepared and the bending loading device of single beam has been upgraded?At the same time,the properties of the specimens were tested.3.The prepared test pieces were subjected to compression and shear tests.The results of test on compressive capability and shear resistance capacity show as follows: the laminated specimen and the cast-in-place specimen have consistency in terms of mechanical properties as well as deformation characteristics.However,the laminated specimen has a slower strain increase and a smaller strain peak.Under the action of vertical loading,Cracks of the laminated specimen are located in the upper part of the column,which do not affect the core area of the column.Under the action of shear loading the lateral crack of laminated specimens occur at the junction of new and old concrete over the column body.Instead,in the cast-in-place specimens,cracks are located in core area of the column foot.Meanwhile,the compressive bearing load of laminated specimen is promoted by 7% compared with that of cast-in-place,meanwhile,the shear resistance load of laminated specimen is increased by 14.4% compared with the cast-in-place specimen.4.A simulation analytical model corresponding with the indoor experimental model is established to analyze mechanical performance and influence factors of the structure.Results show that the laminated model is superior in the performance of load-bearing.At the same time,according to the analysis on how elements affect characteristics of the laminated model,the author draws a conclusion that some factors will improve the overall performance of the laminated structure including the length or thickness of the reinforced angle,the length or diameter of the connecting steel body,and the strength grades of the concrete.Particularly,the length of reinforced angle steel and connecting steel body,strength grades of concrete play significant roles in it.