Compressive Performance Of Load Bearing Horizontal-hole Interlock Concrete Block Masonry

Based on the rectangle horizontal-hole interlocking concrete block,load-bearing horizontal-hole concrete block systems including BH-290,BH-240 and BT-240 is well proposed after optimum design.The block not only can be applied to the load-bearing wall structures,but also has the advantages of low construction technique requirement and fast construction speed.At present,the project team has only studied and analyzed the physical and mechanical properties of the block.On the basis of previous work,this paper conducts experimental tests to study the compressive performance of load-bearing horizontal-hole concrete block masonry,the compressive strength and elastic modulus of masonry are discussed and analyzed by ABAQUS nonlinear finite element simulation.Specific research contents and conclusions are as follows:Firstly,the compressive strength of the block,mortar and concrete were tested and obtained,and the elastic modulus of them were calculated.The results show that the compressive strength of the block meets the requirement of load-bearing block.Secondly,conducted uniaxial compressive tests on the masonry,and its failure mode,initial crack load,breaking load and compressive strength are analyzed.The results show that cracks occured in three kinds of block masonry are all concentrated at the intersection of transverse and longitudinal ribs on the side,and the center lines of the front,and all of the three masonry show the characteristics of brittle failure.The compressive strength of the masonry increases with the increase of the mortar strength,and the strength of the mortar has an effect that can't be neglected.By analyzing the masonry compressive strength test data,fits the calculation formula of masonry compressive strength,and the calculated value of masonry compressive strength is compared with experimental value.The results show that the fitting formula of masonry compressive strength is suitable to apply in engineering practice.Meanwhile,the elastic modulus formula of masonry is deduced by analyzing the deformation characteristics of blocks and mortars,and the elastic modulus of masonry is obtained.Finally,the finite element model of masonry is established and simulated.The results show that the maximum position of stress in block masonry occurs on the longitudinal ribs,and the simulated compressive strength values of the masonry are slightly different with the experimentalvalues.The elastic modulus of masonry simulated by finite element method is larger than deduced elastic modulus,it indicates that there are defects in the masonry applied in practical engineering,which leads to some unavoidable deviation between them.By analyzing the compressive strength of masonry with different material strength,the mortar with strength grade of Mb10 is recommended for all brick masonry with different concrete strength.