Experimental Study And Analysis Of Prestressed Glued-in Rods Joints On Glulam Wood Structure

In recent years,more and more attention has been paid to modern wood structure because of the promotion of green building and assembly architecture in China.The joint of modern wood structure is an important part of force to study,and glued-in rods joints wood structure has the advantages of high bearing capacity and large stiffness,so it is the commonly used connection of beam-column in engineering practice,but its ductility and energy dissipation are poor.At present,the research on the joint of wood structure is mainly about the comparative analysis of the mechanical performance of several common connection forms and the research of the joints with energy-consuming parts,but the research on the joints with prestressing force is less than that.By changing the number of pre-stressed steel robs and the value of prestressing force,the seismic capacity of the joints Whether can be improved by applying prestressing force on the basis of common glued-in rods joints,and the influence of different specific parameters on the mechanical performance of joints is still unknown,so the following work has been carried out:The pseudoi-static test is carried out on one kind of normal glued-in rods joints specimen and five kind of pre-stressed glued-in rods joints specimens.Studying the failure pattern and stress of each specimen under the reciprocating cyclic load in the experiment.By drawing the hysteresis curve,the skeleton curve,the stiffness and the intensity degradation curve of the jionts,and calculating the ductility and energy dissipation capacity of the jionts,the seismic performance of the jionts have been analyzed.By changing the number of pre-stressed steel robs and the value of prestressing force,five kinds of specimens of pre-stressed glued-in rods joints are analyzed according to the mechanical properties of the joints,and the influence of them on the mechanical behavior are obtained.The results show that the seismic behavior of pre-stressed reinforced joint is improved greatly,and the failure pattern is changed from brittle failure to ductile failure.Meanwhile the more pre-stressed steel robs' number is,the better seismic performance of the joint is,and the greater prestressing value is,the greater the mechanical performance of the tension side joint is.ABAQUS finite element analysis was used to simulate the the normal glued-in rods joints and the pre-stressed glued-in rods joints of beam-column connection under the reciprocating cyclic load.Comparing the simulation results with the test results,and the reasons for the difference between them are analyzed.Then the influence of pre-stressed steel robs1 number,the prestressing value,the diameter the anchorage length of glued-in rods on the mechanical behavior of pre-stressed glued-in rods joints have been analyzed.The results show that the number of pre-stressed steel bars,the diameter and the anchorage length of glued-in rods have great influence on the initial stiffness of the joints,besides the prestressing value and the diameter of the glued-in rods have great influence on the bearing capacity of the joints.