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...Modeling construction joints in the spmats program structural mat foundations and slabs on grade are typically required to transfer vertical shear force between adjacent concrete placements of moments across joint may or not be there two possible ways model analyze design a foundation where only is transferred moment introduce weak elements characterized by narrow width at location illustration below thing element defined with low modulus elasticity for b that connects block c since very flexible blocks negligible if dowels employed they modeled slaving node pairs direction dz displacement three being along d e f slaved respectively nodes just it recommended separate criteria assigned one all six then will forced share same after solved reason this approach...