Abstract
Minimum weight design method of pedestrian bridges taking vibration serviceability into consideration is studied. To shorten the computatinal time for structural analysis, an approximation method of vibration serviceability analysis is studied and applied successfully. Two-level optimization technique is also studied. In structural level optimization, design variables are reduced to the geometrical moments of inertia from the sectional sizes of primal problem. Member level optimization is formulated as an optimization problem easy to solve and the way to find the optimal design is presented for both continuous and discrete plate thickness. Simple, two-continuous and three-continuous pedestrian bridges are designed by the proposed method and the efficiency and the validity are shown.
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