8 ハイブリッド型応力法による建物鉄骨架構の制御発破解体解析

概要

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Unified and effective hybrid stress finite element method to simulate elasto-plastic and large deformation behavior in the blasting-demolition process of steel frame structures is presented. According to Refs. 6) and 7), development of the hybrid stress plane beam-column element valid to the large deformation range is formulated, in which the deformations of a element are decomposed into the rigid motions and the relative deformations and the laters are assumed to be small. Also, the well-established Lagrange multiplier method is employed, in order to set the resultant stresses at blasting point to be zero and to evaluate the blasting effect accurately and systematically. As a solution strategy, an arc length method is adopted and is appropriately modified to trace elasto-plastic and large deformation behavior in the blasting-demolition process. The availability and the applicability of this approach are examined, and especially, it is shown that the present beam-column element yields no discretizing errors, under the condition of the relative deformations to be small, in the blasting-demolition process as well as in the external loading. Several numerical tests are performed, and show that the present approach might be very powerful and one of the most promising in this field.
一般社団法人日本建築学会の論文
2005-03-20