Date of Award


Publication Type

Doctoral Thesis

Degree Name



Civil and Environmental Engineering

First Advisor

Kennedy, J.


Engineering, Civil.




Web openings in beams occur quite often in practice to provide convenient passage of environmental services. As a result, storey heights in buildings can be reduced resulting in major cost savings. Some openings generally give rise to excessive deflections and stresses which have to be taken into consideration. In this research, a theoretical and experimental study is carried out to determine the influence of openings on the static and dynamic responses of prestressed concrete beams. The effect of openings on the behaviour of such beams at different stages of loading--transfer stage, working stage, and ultimate stage--as well as under excitation of dynamic load, is presented. The influence of opening dimensions, horizontal and vertical locations, type of cross section on the static behaviour is investigated from the stand point of deformations, stresses, cracking, and ultimate strength capacity. Also the effect of these parameters as well as the number and dimensions of continuous spans on the natural frequencies, mode shapes, stresses, and deformations is presented. The results from a non-linear finite element static analysis are substantiated by static test results from thirteen post-tensioned prestressed concrete beams, six of which were rectangular in section, five were T-, and two were of I-section. Also the results from a finite element dynamic analysis are substantiated by dynamic test results in the literature. Good agreement is shown between the theoretical and experimental results. Furthermore, an extensive parametric study is performed on prestressed beams with openings to: develop a design procedure against cracking of the opening chords; estimate the beam maximum deflection; find the distributing ratio of the shear force between the opening chords; obtain the ultimate capacity of prestressed beams with openings; and determine the natural frequencies, and hence the dynamic response of simply supported and continuous prestressed beams with openings.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .A333. Source: Dissertation Abstracts International, Volume: 54-09, Section: B, page: 4817. Adviser: J. B. Kennedy. Thesis (Ph.D.)--University of Windsor (Canada), 1993.