Research On Performance Of Hardware Connection On Corner Joint Of Bamboo Glulam Furniture

Bamboo glulam furniture usually use hardware of wood furniture to bond.However,due to micro-structure and macroscopic characteristics,the larger differences of bamboo glulam,wood and wood-based panel,in the manufacturing process of technology and other materials are also different,so crucial parts of the use of hardware bonding on bamboo glulam furniture still exists a series of problems.The corner of the furniture design is a very important part of the furniture structure design,its bonding of performance can affect the structural properties of the whole furniture.This topic will be the corner joint of bamboo glulam furniture as a starting point,research bamboo glulam furniture hardware bonding performance,analysis bamboo glulam furniture corner hardware joint damage causes.Focus on the influence of hardware bonding pattern of bamboo glulam furniture on corner joint.Then,on the more excellent way of bonding the hardware,to further optimize.So as to effectively improve the hardware bonding performance on corner joint of bamboo glulam furniture.And draw the following conclusions:(1)Bamboo glulam furniture corner of the hardware joint damage are the main reasons:bamboo glulam material,furniture structure,including the overall structure and parts of their own structure,the way between the joints,the form of force and the strength of the hardware connector.(2)Bamboo glulam furniture in the corner of the hardware bonding,the tensile bending moment and the bending moment of commonly used hardware bonding: the bolt type? the screw type> the four in one connection> the three in one connection piece(used trapezoidal iron nut with cap)> the three in one connection piece(used the nylon nut).The strength of the screw and the bolt is high,the damage of the corner joint of the bolt is less than that of the screw,and it can be disassembled and assembled many times.The analysis shows that hardware connection performance of the bolt type on corner joint is relatively better,but there is a problem that the nut insert is easily pulled out.In the case of the bolt type with different types of pre-embedded nuts,the bonding performance :trapezoidal iron nut with no cap> trapezoidal iron nut with cap> nylon nut.(3)Bamboo glulam furniture on corner joints use with the same hardware bonding form,the tensile strength was obviously greater than the compressive strength,tensile bending moment was greater than the compression bending moment,indicating that the bamboo glulam furniture on the corner is more likely to be damaged when subjected to the inward direction pressure than by the outward pulling force.(4)The ultimate tensile strength of different embedded nuts is: nylon nut<screw-in sleeve with spine <expansion nut<trapezoidal iron nut <screw-in sleeve with hexgon socket and flange.The ratio of guide ratio and the screwing depth of the thread have a significant effect on the pull-out performance of the embedded nut.The tooth distance and tooth thickness of the thread of the embedded nut have no significant effect on the pull resistance of the embedded nut.But the test group is limited and there are errors,the test conclusion has some limitations.(5)The optimum parameters for the embedded nut are: screw-in sleeve with hexgon socket and flange,take the guide aperture ratio of 93%,thread length of 25 mm,thread spacing and thickness of 2mm,0.8mm,the pull-out force in the bamboo glulam is most.Under the optimum matching parameters,the tensile strength of the bolts is improved by 23.2% and the compressive strength is about 54.5%.After optimization,the damage of the bolts under the action of tensile force and compressive force is obviously reduced,and the embedded nuts are almost unplugged.