| Prefabricated timber structures have gradually attracted attention in our country,and glulam frame structures have been a research hotspot in recent years.Common timber structure beam-column connection methods at home and abroad include traditional bolt connection,tooth connection,bolt-steel connection and nail connection,but there are problems of large steel volume and low initial stiffness.With the continuous rise of multi-and high-rise timber frame structures,the requirements for the bearing capacity and stiffness of the joints are higher,and the glued-in rod connection can be considered as a new choice.However,the research on the connection of timber structure planting bars is not sufficient,especially the problem of installation deviation that is difficult to avoid has not been solved.Based on the existing literature research and related specifications,this dissertation designs a glulam beam-column reinforcement joint suitable for on-site rapid assembly.The test deviation is compared with the actual finite element model for force performance analysis,so as to predict the failure to capture key point data.The main research work and conclusions are as follows:(1)Determine the geometric parameters of beam-column joints with reference to relevant specifications,and determine the material properties of glulam utilizing material properties;use ABAQUS finite element software to establish the designed reinforcement joint model,apply cyclic reciprocating load to analyze the joint bearing capacity in the finite element analysis is checked through comparison with theoretical analysis,which lays the foundation for the follow-up research.(2)Carry out reversed cyclic loading test on the glulam beam-column planted bar joints to analyze the failure form,hysteresis characteristics,skeleton curve,stiffness degradation,strength degradation and energy consumption capacity of the joints.The results show that the initial stiffness of the joint is relatively large,and a certain amount of slippage occurs during the loading process;the comparison of the finite element skeleton curve diagram is quite different,and it is speculated that the error originates from the deviation of the test installation.(3)Establishing a finite element model of planted bar joints considering the influence of installation deviation to conduct quasi-static analysis.The results show that the simulation results are slightly higher than the test results in terms of the bearing capacity of planted bar joints;in order to improve the simulation accuracy,life and death element technology is introduced.After comparing the bearing capacity of the joints,the simulation results are slightly lower than the test results.It is analyzed that the two methods have different control over the degree of cracking of the adhesive layer.One is "conservative" method and the other is "exaggerated" method.Therefore,a method of combining the two methods is proposed to predict the actual bearing capacity of the joint. |
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