YIELD-LINE ANALYSIS AND EXPERIMENTAL STUDY OF REINFORCED CONCRETE SLABS CONTAINING OPENINGS by Stephen Gregory Ahart Thesis submitted to the Faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Master of Science Don A. Garst in Civil Engineering APPROVED: Richard M. Barker, Chairman December, 1986 Blacksburg, Virginia Kamal B. Rojiani