Experimental Study On The Axial Compression Performance Of Steel Plate-brick Masonry Combination L-shaped Short Column

With the wide application of steel plate materials,it has been applied to the reinforcement of building structures in recent years.The steel plate is used for reinforcement,although the steel plate with a large difference in performance is used to combine with the brick masonry.However,the advantages of the two materials can be fully realized through the connection of the pull bolt and the bonding materials.The main method is to attach the steel plate to the exterior of the reinforced masonry structure,to connect the steel plate on both sides through the pulling bolt in the middle,and the interspace is filled and strengthened with some cement slurry and other bonding materials,so as to form a member structure similar to the shear wall structure.However,in the original brick-concrete structure,the site of the damage is generally in the structural stiffness mutation,force load and other places,etc,especially for the general intersection of horizontal and vertical walls,the possibility of destruction is greater.So when it is necessary to reinforce these places with steel plates,some L-shaped,T-shaped sections of the wall will be produced,through reinforcement,the original building will become stronger?more durable? more beautiful? and more promising,it will play a positive role in popularizing the application of this kind of steel plate-brick masonry short columns.Based on this background,the overall stress of the structure is analyzed by field test on the steel plate brick masonry combination and l-shaped short column.The main research contents are as follows:(1)Through the axial compression test of one L-shaped masonry structure column and three combined L-shaped columns,the variable factors are commonly used bolt spacing of300 mm,400 mm and different thickness of steel plate in the construction process.The longitudinal spacing of the bolts and the thickness of the steel plate were analyzed by comparing the two sets of variables.(2)Through the finite element simulation analysis,it provides the basis for the theoretical research.The test results are as follows:(1)The experimental results show that the load capacity of the brick is increased by three times when the thickness of steel plate is 2mm,when the thickness is 3mm,specimens is increased by 3.48 times;(2)the thickness of the steel plate for 3mm specimens than 2mm thickness steel plate specimens of ultimate bearing capacity increased by 14.11%;(3)For the bolt spacing,longitudinal bolt spacing is 300 mm specimen than longitudinal bolt spacing is 400 mm specimen ultimate bearing capacity increased by 18.86%,it is shown that shorter spacing can effectively improve the load bearing capacity of the whole component.(4)Based on the working mechanism of steel plate brick masonry composite column,the theoretical calculation of bearing capacity of steel plate brick masonry composite column is analyzed,based on different national specifications,analysis and comparison of different theoretical formulas for bearing capacity,the formula of ultimate bearing capacity of steel plate and steel masonry composite column members is obtained.