入力地震動の空間変動が立体トラスの最適設計に及ぼす影響

概要

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An optimal design method considering effects of spatial variation of input ground motions is applied to structural design of space trusses. Wave passage effect, loss of coherence (incoherence effect) and variation of local soil condition (local effect) are investigated in this paper. The optimal design problem is formulated for finding optimal cross-sectional areas of members so as to minimize the total volume under strain constraints. After the optimal design method is outlined, optimization is carried put for doublelayer space trusses under different local soil conditions. The effects of the soil condition, soil spring stiffness at supports and types of structural foundation on the optimal solutions are revealed. The effects of wave passage and incoherence are also discussed. Accuracy of optimization results is examined through time history response analyses.
2004-06-30