Document Type



Master of Science (MS)


Civil Engineering

First Advisor's Name

LeRoy E. Thompson

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Ton-Lo Wang

Third Advisor's Name

Luis A. Prieto-Portar


Girders, Computer programs

Date of Defense



One of the major problems in the analysis of beams with Moment of Inertia varying along their length, is to find the Fixed End Moments, Stiffness, and Carry-Over Factors.

In order to determine Fixed End Moments, it is necessary to consider the non-prismatic member as integrated by a large number of small sections with constant Moment of Inertia, and to find the M/EI values for each individual section. This process takes a lot of time from Designers and Structural Engineers.

The object of this thesis is to design a computer program to simplify this repetitive process, obtaining rapidly and effectively the Final Moments and Shears in continuous non-prismatic Beams.

For this purpose the Column Analogy and the Moment Distribution Methods of Professor Hardy Cross have been utilized as the principles toward the methodical computer solutions.

The program has been specifically designed to analyze continuous beams of a maximum of four spans of any length, integrated by symmetrical members with rectangular cross sections and with rectilinear variation of the Moment of Inertia. Any load or combination of uniform and concentrated loads must be considered.

Finally sample problems will be solved with the new Computer Program and with traditional systems, to determine the accuracy and applicability of the Program.




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