To study the mechanical properties of masonry wall strengthened with steel members

accurate nonlinear calculation methods for masonry wall must be provided.Considering similar material properties of masonry and concrete

a numerical method including the modified concrete damaged plasticity model was used for nonlinear finite element analysis of the masonry wall.The presented model was validated by comparing the computed results with experimental results.The effects of viscosity coefficient and dilation angle of damaged plasticity model

the elastic modulus as well as the tensile stress-strain relation of masonry on the computed results were investigated. The results indicate that the viscosity coefficient and dilation angle have great influence on the shear capacity

peak displacement and descending stage performance

but have little influence on the initial stiffness of the masonry wall.With the increase of initial elastic modulus

the shear capacity of the masonry wall improves obviously

but the change of peak displacement is unobvious.Both the shear capacity and peak displacement of the masonry wall are greatly influenced by the undetermined coefficient in the tensile stress-strain equation.