Multi-objective Optimization of Post-tensioned Pedestrian Bridge
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Date
2021-09
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Addis Ababa University
Abstract
Multi-objective design optimization of post-tensioned box girder pedestrian bridge is
presented in this study. The proposed design optimization incorporates some behavior and
side constraints specified by the AASHTO Standard specifications. Multi-objective
optimization is performed to minimize the cost and maximize the safety factor for the
ultimate limit states. Considering stress and deflection limits as design constraints, and
geometrical dimensions of the box-girder and shear reinforcements as design variables.
Additionally, application of MATLAB routine gamultiobj algorithm for the design of posttensioned
pedestrian bridge is presented, and a set of solutions in the pareto front are
illustrated in graphical format. Then multi-criteria decision analysis method named
TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) is used to
determine the single optimal result from the Pareto set solutions by giving weight to the
objective functions
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Keywords
Pedestrian Bridge, Post-Tensioned