A 12-node hybrid stress brick element for beam/column analysis
In this paper, a hybrid stress 12-node brick element is presented Its assumed stress field is derived by first examining the deformation modes of a geometrically regular element and then generalizing to other element configurations using tensorial transformation. The total number of stress modes is 30 which is minimal for securing the element rank. To reduce the computational cost associated with the fully populated flexibility matrix, the admissible matrix formation is employed to induce high sparsity in the matrix, Popular beam bending benchmark problems are examined. The proposed elements deliver encouraging accuracy.
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