Natural fibers have recently raised attention for presenting adequate mechanical characteristics for reinforcement of structural elements. The use of both natural fibers, in especial Sisal fibers, in wood laminated be...Natural fibers have recently raised attention for presenting adequate mechanical characteristics for reinforcement of structural elements. The use of both natural fibers, in especial Sisal fibers, in wood laminated beams and also wood from reforestation, is in accordance with the current economic interest and ecological appeal. Specifically, the strengthening of wood laminated beams with Sisal fibers is more effective for structures that require an increase in their structural capacity without a significant increase in height of the cross section. Furthermore, it is recommended that this type of reinforcement is used in wood structural elements where the elastic modulus is at least equal to the Sisal fibers. The composition of Sisal fibers is basically of cellulose, lignin and hemicelluloses. In particular, the amount of cellulose and the angle that the micro-fibers with the axis of the fiber characterize the failure strength and the modulus of elasticity. The average mechanical characteristics of the Sisal fiber are： tensile strength 347 to 378 （MPa） and elastic modulus 15.2 （GPa） whereas these properties are lower for strips of Sisal fibers. In this context, this paper deals with the analysis and the viability of the use of Sisal fibers in wood structures as a reinforced material.展开更多
The study was conducted to investigate the electron beam which can affect the penetration improvement and fixation of chemicals in wood. High permeability of the electron beam has applied to improve penetration of fir...The study was conducted to investigate the electron beam which can affect the penetration improvement and fixation of chemicals in wood. High permeability of the electron beam has applied to improve penetration of fire retardant into wood. Changes in the characteristics of the wood, retention of the retardant on different electron beam dose, leaching resistance of treated wood were examined. SEM/EDS （Scanning electron microscopy or energy dispersive spectrometer） analysis has been conducted to investigate the chemical elements and to calculate the distribution of each component.展开更多
Wood material can be demolished over time due to different environmental factors.Structural elements may need to be strengthened over time as a result of possible natural disasters or during use.Beams are elements und...Wood material can be demolished over time due to different environmental factors.Structural elements may need to be strengthened over time as a result of possible natural disasters or during use.Beams are elements under load in the direction perpendicular to their axes.Therefore,they are basically under the effect of bending.When the studies on the behavior of beams against bending test are examined,it is known that the bottom surface of the material generally breaks.For this reason,fiber reinforced polymers(FRP)materials have been used in recent years to reinforce beam members.It is a scientific fact that it is necessary to prefer FRPs for the solution of this problem,as well as their properties such as lightness,corrosion and flexibility,their application without disrupting the appearance of wood.In this study,it was aimed to investigate the effect of reinforcing wooden beams with fiber reinforced polymer materials with different properties on different bending behaviors such as load bearing capacity,ductility,modulus of elasticity.It was observed that the ductility and bearing capacity of wooden beams reinforced with fiber reinforced polymer materials increased significantly compared to non-reinforced beams.展开更多
Wood beam-column frame is a popular structural system in United States and in ancient China. Chinese wood beam-column frame structures showed better seismic resistance properties than the US ones.The tenon joint is on...Wood beam-column frame is a popular structural system in United States and in ancient China. Chinese wood beam-column frame structures showed better seismic resistance properties than the US ones.The tenon joint is one of the reasons.This study performed monotonic and cyclic pushover tests to understand the behavior of Chinese tenon joints versus the behavior of the commonly used US wood beam-column connections. The test results indicate that the typical US wood beam-column connection is very strong under monotonic loads.The ancient Chinese tenon joint has the best behavior under cyclic loads.展开更多
文摘Natural fibers have recently raised attention for presenting adequate mechanical characteristics for reinforcement of structural elements. The use of both natural fibers, in especial Sisal fibers, in wood laminated beams and also wood from reforestation, is in accordance with the current economic interest and ecological appeal. Specifically, the strengthening of wood laminated beams with Sisal fibers is more effective for structures that require an increase in their structural capacity without a significant increase in height of the cross section. Furthermore, it is recommended that this type of reinforcement is used in wood structural elements where the elastic modulus is at least equal to the Sisal fibers. The composition of Sisal fibers is basically of cellulose, lignin and hemicelluloses. In particular, the amount of cellulose and the angle that the micro-fibers with the axis of the fiber characterize the failure strength and the modulus of elasticity. The average mechanical characteristics of the Sisal fiber are： tensile strength 347 to 378 （MPa） and elastic modulus 15.2 （GPa） whereas these properties are lower for strips of Sisal fibers. In this context, this paper deals with the analysis and the viability of the use of Sisal fibers in wood structures as a reinforced material.
文摘The study was conducted to investigate the electron beam which can affect the penetration improvement and fixation of chemicals in wood. High permeability of the electron beam has applied to improve penetration of fire retardant into wood. Changes in the characteristics of the wood, retention of the retardant on different electron beam dose, leaching resistance of treated wood were examined. SEM/EDS （Scanning electron microscopy or energy dispersive spectrometer） analysis has been conducted to investigate the chemical elements and to calculate the distribution of each component.
文摘Wood material can be demolished over time due to different environmental factors.Structural elements may need to be strengthened over time as a result of possible natural disasters or during use.Beams are elements under load in the direction perpendicular to their axes.Therefore,they are basically under the effect of bending.When the studies on the behavior of beams against bending test are examined,it is known that the bottom surface of the material generally breaks.For this reason,fiber reinforced polymers(FRP)materials have been used in recent years to reinforce beam members.It is a scientific fact that it is necessary to prefer FRPs for the solution of this problem,as well as their properties such as lightness,corrosion and flexibility,their application without disrupting the appearance of wood.In this study,it was aimed to investigate the effect of reinforcing wooden beams with fiber reinforced polymer materials with different properties on different bending behaviors such as load bearing capacity,ductility,modulus of elasticity.It was observed that the ductility and bearing capacity of wooden beams reinforced with fiber reinforced polymer materials increased significantly compared to non-reinforced beams.
文摘Wood beam-column frame is a popular structural system in United States and in ancient China. Chinese wood beam-column frame structures showed better seismic resistance properties than the US ones.The tenon joint is one of the reasons.This study performed monotonic and cyclic pushover tests to understand the behavior of Chinese tenon joints versus the behavior of the commonly used US wood beam-column connections. The test results indicate that the typical US wood beam-column connection is very strong under monotonic loads.The ancient Chinese tenon joint has the best behavior under cyclic loads.
