等価線形FEMの適用に関する考察 : 体積変化の顕著な場合ならびに軸対称構造が非軸対称荷重を受ける場合について

抄録

The purpose of this paper is to indicate the applicability of the Equivalent Linear Method in Finite Element Technique in the following two cases. 1) Volume change exists as well as distortion. 2) Axisymmetric body or structure under unaxisymmetric load. The contents of this paper can be summarized as follows. 1) Calculation of rigidity and damping ratio by the Equivalent Linear Method using shear strain is shown to be reasonable under conditions where volume increases or decreases and distortion is present. Iwan's model is utilized for this purpose. 2) A method of analysis is proposed by the axisymmetric Finite Element Technique when axisymmetric structures or solids of revolution are deformed by unaxisymmetric load to become partly plastic. By this technique, a typical value of the strain on an axisymmetric element is determined using strain energy due to distortion. 3) Results from the above method are compared with those of the shaking table test of a coal silo model, and shown to be accurate enough for practical purposes.