The Computation Of Coupled Shear-wall With An Improved FEM's Element

In this paper, the triangle plane element with rotational degrees of freedom and the link element are to solve the problem of connection between the walls and the coupling beams.Basing on the 6-node linear triangular element, the middle nodes of edges were removed, and an element with drilling degree of freedom was introduced by means of linear interpolation in tangential and quadratic interpolation in normal.At the same time a parameter was introduced.By letting the drilling degree of freedom at the elemental nodes equal to the rotation defined in elasticity, the value of the parameter was determined, which led to an additional equation that eliminated the spurious zero energy mode. The concrete examples show that the new element has same precision as the original Allman's element do, but no spurious zero energy mode. Most importantly,it is proved that the drilling degree of freedom in the present element can correctly pass the twist moment.The elastic-plastic constitutive model for concrete and steel are adopted firstly for material model. it is applied for singly loading by using ANSYS'S UPFs.An experiment of the model of reinforced concrete coupled shear walls at the University of Canterbury and several classic examples are analyzed. It is found that good agreement between the analytical results and the experimental results.