Experimental Study On Local Compression Strength Of Coal-shale Fired Perforated Brick Masonry

Due to the environmental harm caused by the excessive consumption of Solid Clay Bricks, a kind of traditional building material, the country has published the provision to confine the use of SCB, and urged to research and develop new type materials for building walls. Meanwhile, with the development of energy conservation in buildings, SCB could not meet the need of thermal insulation any more. In order to protect environment and economize resources, the city of Chongqing utilizes its own abundant shale and coal-store resources, and manufactures the Coalstore-shale Fired Perforated Brick. Through the experimentation for the physical performance of CFPB Masonry under local compression, the author has observed the deformation and failure of CFPBM. Based on the mathematical statistics and regression analysis of the experimental data, the author derived a feasible and common formula for counting the CFPBM's local compression strength regarding the different local compression locations, analyzed stress distribution of local bearing masonry under beams end, and provided the calculating formula on effective supporting length of beam end in brick masonry. As the results of experiments demonstrate, owing to the CFPB's own holes' system, the beneficial effects, the bounding effect of surrounding masonry and the spread effect of force, have not developed completely. So, contrasting with the SCB Masonry, the local compression strength of CFPBM is much lower. With the restriction of CFPB masonry on the beam end, the cantilever effect and the internal arch effect on the bean end, which is to discharge the upper stress of masonry to the lower masonry, are weaken. Therefore the helpful influence of upper masonry is neglected in calculating the local bearing strength. The author has derived the formula to calculating the local compression coefficient () of CFPBM in the form of radical expression and logarithm expression. Besides these experiments, the author also used ANSYS (a finite element program) to analyze the effect on the perforated bricks' physics caused by theshape, the ratio and the arrangement of holes. Furthermore, the author compared the results of experiments with finite element methods and received an ideal agreement.