Experimental Study And Simulation Analysis On Mechanical Performance Of Grouted Block Masonry

Concrete hollow block has distinct economic and social benefits, especially recently, Medium-high and high-rise masonry structure has been widely used in engineering for this advantages. Development in reinforced block masonry becomes one of primary direction in masonry structures. It has great significance to carry out the fundamental works such as study on the failure criterion of grouted concrete masonry under biaxial stress state. When reinforced masonry structures are still further studied.The author studies the failure modes, failure mechanisms, load-bearing capacity and deformation capacity of grouted masonry by biaxial stresses tests of masonry panels. The test result shows that the failure modes of grouted concrete masonry under biaxial compression-compression can be attributed to three types: slipping of mortar joints, cracking of vertical joints and block, biaxial compression spalling. For most angels, failure occurrs by splitting in a plane parallel to the surface of the specimen at mid-thickness when the principal stress ratio . The influence of joint orientation and the principal stress ratio to the masonry strength is also discussed.The failure envelope of grouted concrete masonry is obtained by fitting the test results of masonry panels under biaxial compression-compression. And it's compared with the failure envelope of concrete and brick masonry. The author deduces the theoretical failure envelope from Tsai-wu tensor multinomial criteria. It is in good agreement with the test results. moreover, the author summarizes and systematizes the experimental data of uniaxial tension and biaxial tension-compression from this test and other studies. And the failure envelope in the biaxial tension and biaxial tension-compression region is obtained. So we proposes a complete failure surface for grouted concrete masonry.At last, the general non-linear FEA program ANSYS is used to simulate the test results and reappear test process of concrete block masonry. By parameters alteration analysis, the effect of main factors on the compressive strength of concrete block masonry are analyzed, and the distribution of stress of concrete block masonry under loads is presented. The results of FEA are shown that the behavior of concrete, block and mortar has important influence on the behavior of concrete block masonry. The well precision of results by non-linear finite element method for concrete block masonry is proved that ANSYS can be used to the masonry non-linear FEA.The results of the paper can be used to reference for design of masonry structure design and the theoretical research.