Experimental Study On Compression Resistance Of Modified Fast-growing Poplar Short Columns

Timber structure has a long history in China.Since the modern times,due to the environment,population and other reasons,the development of China’s timber structure has been greatly restricted,and theoretical research has stagnated.In recent years,timber structure have gradually gained favor,and the demand for timber structure has increased.However,the current status of forest resources in China does not allow China to vigorously develop timber structure.Therefore,it is of great practical significance to make use of China’s abundant plantation tree species and to modify it to make it suitable for modern timber structure buildings.In this paper,fast-growing poplar was used as the experimental object,and the fast-growing poplar short column was modified by structural glue,carbon fiber cloth and steel plate.The main research work is as follows:1.Through the test of the compression resistance of a short poplar column and 7 modified short columns with structural glue,the failure mode and the force mechanism under pressure are summarized.The thickness of the plate and the initial eccentricity are analyzed.The law of influence of its carrying capacity.The test results show that the fast-growing poplar structural adhesive modified short column bearing capacity is greatly improved,the deformability is improved,the brittle fracture characteristics are obvious when the damage is broken,the bearing capacity is not related to the thickness of the sheet,and the eccentric pressure is pressed.The form of its failure is gradually transformed from the failure of the sheet strength to the shear failure of the bonding surface.2.Through the test of the compression resistance of 6 modified short columns with carbon fiber cloth,the failure mode and the force mechanism under pressure are summarized.The influence of the width of carbon fiber cloth and initial eccentricity on its bearing capacity was analyzed..The test results show that compared with the structural rubber modified specimens,the carbon fiber cloth modified reinforced short column bearing capacity is basically unchanged,the specimen stiffness becomes larger,the deformation capacity is reduced,and the brittle failure characteristics are exhibited during the failure.3.Through the test of compression resistance of 6 modified short columns with steel plate,the failure mode and force mechanism under pressure are summarized.The influence of steel plate thickness and initial eccentricity on its bearing capacity is analyzed.The test results show that compared with the structural rubber modified specimens,the bearing capacity of the steel plate modified and strengthened short column is greatly improved,the rigidity of the test piece becomes larger,the deformation capacity is reduced,and the brittle failure characteristics are exhibited when the damage occurs.