Experimental Research On The Basic Mechanical Properties Of Compound Concrete Hollow Brick Masonry

A new wall material, Concrete Hollow Brick is developed based on the widespread application of Small Concrete Hollow Block and designed using the size of normal clay brick. This new kind of Concrete Hollow Brick has many advantages of Small Concrete Hollow Block. At same time, lessons were learned through the practical experiences to improve the performance of the Concrete Hollow Brick. The research object in this paper was Compound Concrete Hollow Brick with foam cement mortar in its internal. The insulation and heat-shielding performance of it have be improved greatly. Based on experimental results, modified theory and finite element method, the compression performance and nonlinear behavior of Hollow Concrete Brick were further discussed hereafter. The main research work and results are as follows:(1) Compression test of eight Hollow Concrete Brick masonry specimens was conducted, followed by the analysis of the type of compression damage, cracking load and failure load of the specimens. The test results showed that the Concrete Hollow Brick masonry presented more obvious brittle behavior and lower compressive strength compared with the clay brick masonry. The main reason was the parts of the concrete hollow bricks’end have a gap. Moreover, through the analysis of the existing theories, standard formula in brick-structure design standard is applicable to the calculation of the compressive strength of Concrete Hollow Brick masonry, while the formula coefficient needs to be increased. And imagined a new Concrete Hollow Bricks with round pass to improve the compressive strength of the bricks.(2) this paper studied the theory of constitutive relation of compressed masonry and adopted national wide-used expression to calculate the relation. Meanwhile, compression deformation of masonry of specimens was calculated, stress-strain relationship was plotted, and the Elastic Modulus and Poisson ratio of masonry were obtained. The analysis reports that the experiment results show great agreement with the theoretical results.(3) finite element model was built using ANSYS to simulate the test procedure. The graph of the deformed masonry, cracking crash graph, the stress distribution and the stress-strain curve of the specimen were obtained from the model. Finite element analysis and test results have some difference, need further analysis and research.