Research on constitutive model of brick masonry under uniaxial compression for numerical simulation
In the present constitutive model of brick masonry under uniaxial compression,the prediction of elastic modulus and peak strain is not accurate,leading to the difficult numerical simulation analysis of brick masonry.The elastic modulus,axial compressive strength and peak strain of brick masonry were analyzed based on the data of 145 specimens collected.The results show that the current calculation formula of elastic modulus is not suitable for brick masonry with low or high elastic modulus,and the elastic modulus has a multiple relationship with the secant modulus of the peak point,which is determined by strength and type of masonry materials.The calculation formula of axial compressive strength has good accuracy.The peak strain analysis of brick masonry is classified according to concrete brick and non-concrete brick.The peak strain of non-concrete brick masonry has a nonlinear relationship with the mortar strength,which should be determined by mortar strength.However,the mortar strength has little influence on the peak strain of concrete brick masonry which ranges from 0.001～0.002.Finally,a better applicable constitutive model of brick masonry under uniaxial compression for numerical simulation was proposed.
brick masonryuniaxial compressionconstitutive relationnumerical simulationelastic modulus calculation formula
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