Experiment Study On Connection Behaviour Of Gout-filled Pipe Splices Connector In High Temperature

In recent years,with the rapid development of housing industry,precast assembly building,as a structure form which was generalized vigorously by national and local government,has gradually become a hot issue in the field of construction engineering.Gout-Filled Pipe Splices connection is one of the key techniques to join the prefabricated members in precast assembly structures,it is also the main problems to be resloved in application and spreading of precast assembly bulidings.At present,almost all research of Gout-Filled Pipe Splices connection concentrated on the behavior in room temperature,there is less research to study the mechanical properties in elevated temperature.In this paper,the elevated temperature experimrnt was developed to analyse the ultimate bearing capacity,ductility,failure mode of specimens.And the bond-slip behaviors of connections in high temperature was simulated in ABAQUS to obtain the high temperature performance in different steelbars diameters.The main work of this paper are summarized as follows:(1)Develop the elevated temperature experiments of the connection in different steelbars diameters,which is 16 mm,20mm,and 25 mm,at six experiment temperature spots.There were three specimens at every temperature spot corresponding to each reinforcement diameter,the total number of speimens is 54.(2)The load displacement curves and failure mode were obtained in experimental process at every temperature point.Based on the load displacement curves,the ultimate bearing capacity,stiffness bonding strength,ultimate strength and ductility were analysed.(3)Compare the different failure modes of each specimen in elevated temperature with that in room temperature,and analyse the failure law of each connector in different diameters at every temperature spot.(4)Analyse the performance of Gout-Filled Pipe Splices connection at elevated temperature in ABAQUS.To simulate the bond ralationship in the interface by Non-linear spring element Spring2,then analyse the bonding anchor effect of this kind of connection in high temperature,which was compared with the experimrnt results.