塑性節点法による繰り返し荷重下の骨組構造の弾塑性解析

概要

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Extending the basic theory of Plastic Node Method (PNM) , a new method of elastic-plastic analysis of framed structures considering combined strain-hardening effects is developed. The proposed method is applied to two and three-dimensional frames under cyclic loads. In the PNM, a generalized hinge mechanism (plastic node) based on the flow theory of plasticity is introduced at a node of beam-column elements. A strain-hardening rate for the plastic node is obtained by equating a plastic work done at the plastic node with that evaluated in the actual elastic-plastic stress distribution in the element. The resulting elastic-plastic stiffness matrix can be derived simply by matrix calculation. The numerical results are compared with those calculated by FEM program MARC. It was shown that the proposed . method provides very accurate results in a short computation time.
社団法人日本船舶海洋工学会の論文