AN INTEGER PROGRAMMING MODEL FOR LAYOUT DESIGN OF WATER DISTRIBUTION NETWORKS

A model for the layout optimization of water distribution networks under single loadings is presented. The model uses zero-one integer programming to select the links that should form the network, while still satisfying looping, redundancy, and hydraulic requirements. This solution constitutes a starting solution to any network component optimization model. A network component optimization step, using well established design models, is then applied to this solution to refine the pipe sizes and pressure heads, thus giving a layout and component optimal solution. The model is demonstrated by application to an example.     

OPTIMUM DESIGN OF BEAMS IN MULTI-STOREY STEEL FRAMES USING THE LRFD CRITERIA

This paper deals with the optimum design of beams in multi-storey steel frames using the recently proposed LRFD criteria. The results are compared with those obtained using the conventional plastic design criteria. The optimization problems which are nonlinear in nature are either solved using an appropriate nonlinear optimization technique or linearized and solved by the simplex method. Numerical examples presented consider the design of three-bay 9 storey, 17 storey and 26 storey frames.