| Glass Fiber Reinforced Polymer（GFRP）is a new kind of material which has been applied in engineering structure in recent years.It has excellent properties such as light weight,high strength and corrosion resistance.However,this kind of material is prone to brittle failure in practical engineering.It is a good idea to improve the ductility of joints by friction sliding of frictional high-strength bolts in long round bolt holes.This idea is applied to the GFRP beam-column joints.The bolt holes on the GFRP beams are cut into long round holes instead of the conventional round holes,and the joint is studied by experimental and numerical simulation.This article first expounds the research present situation and the trend of GFRP material at home and abroad,research status and prospect of semi-rigid connections,and then to enlarge pass GFRP beam-column joints has carried on the preliminary design,and through the test and the pass of the ABAQUS finite element simulation method for this kind of expansion GFRP beam-column joints to study the mechanical properties,And made a mechanical evaluation of this beam-column joint.Under monotonic loading condition,respectively for Angle steel and casing connector of two groups of nodes,a total of five for one-way loading test specimens,to adopt different bolt hole with or without lateral plate reinforcement,column node,bolt pre-tightening force of 15 k N,10 k N and 5 k N specimen has carried on the experimental study,compared the two groups of node failure modes and bending Angle curve,plastic rotation capacity and yield stiffness.The experimental results show that the tearing failure at the junction of GFRP beam flange and web occurred in all the five specimens.The ultimate bending moment bearing capacity of the specimen with side plates can be increased by 30%.Although the reaming method will not increase the bearing capacity of the joint,the plastic rotational capacity of the reaming joint is 1.18 times that of the ordinary circular hole joint.The finite element analysis of GFRP beam-column joints connected with reamed Angle steel was carried out by ABAQUS software.Firstly,J1 and J2 specimens were simulated in this paper,and the simulated data obtained were compared with the experimental data to verify the correctness of ABAQUS simulation.The stress nephogram,bending moment Angle curve,plastic Angle and ductility coefficient of three Angle steel joints with reaming length of 2mm（K2）,4mm（K3）and 6mm（K4）were compared and analyzed.It is found that reaming can obviously improve the mechanical properties of joints.The longer the reaming length is,the longer the slip section of the joint.When the reaming length increases by 2mm,the plastic rotation Angle increases by about 6%.An increase of 2mm in the reaming length can increase the ductility by about 5%-11%,especially when the reaming length increases from 2mm to 6mm,the ductility increases by 11%.The comprehensive analysis of the test and the finite element results shows that the ductile deformation capacity and seismic performance of the joints increase with the increase of the reaming length,and the reaming method can improve the ductility of the GFRP beam-column joints. |
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