Optimization of Prestress U-Tub Girder of Lahore Orange Line Metro Train

Abstract

This research is based on the design and analysis of prestress girder and then cost optimization is
performed using optimization technique. Constraints are set in optimization technique in order to achieve design which
are feasible. Two different types of constraints are set; one is based on the restrictions on design variables whereas the
other depends on the design variables called implicit constraint, which are formulated using stresses and flexural
strength requirements. A computer programming code is established for design and analysis of girder in separate
subroutine whereas for optimization another subroutine is developed. Both of them are then linked together to get the
final result which are the cost effective design