Document Type

Thesis

Date of Award

5-31-1989

Degree Name

Master of Science in Civil Engineering - (M.S.)

Department

Civil and Environmental Engineering

First Advisor

Farhad Ansari

Second Advisor

C.T. Thomas Hsu

Abstract

This research consists of the application of nonlinear optimization techniques for the economical design of prestressed concrete members. A computer program using Lattice and Matrix methods of optimization is employed for least weight design of I-shaped prestressed concrete girders. The program calculates the most optimum values of the cross-sectional dimensions.It has the freedom to impose any constraints on any of the design variables, including sectional dimensions, eccentricities, concrete cover and limiting stresses.

Comparison of results obtained in this thesis with other analytical methods indicate that with the advent of computers, the numerical methods have a definite advantage over other analytical methods. This is due to ease of operations, speed and accuracy, freedom to impose constraints on design variables, and finally the advantage to calculate the individual sectional dimensions rather than calculating total areas and sectional modulii of members.

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