Date of Award


Publication Type

Master Thesis

Degree Name



Civil and Environmental Engineering

First Advisor

Madugula, Murty K. S.,


Engineering, Civil.



Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.


This investigation focuses on the flexural strength of circular flange connections in monopoles with particular attention to the role of stiffeners. Four finite element models---(a) 25.4 mm thick flange unstiffened connection, (b) 25.4 mm thick flange stiffened connection, (c) 19.1 mm thick flange unstiffened connection and (d) 19.1 mm thick flange stiffened connection, with eight 25.4 mm diameter bolts for each connection, were developed. The finite element models were validated by comparing the finite element failure loads, deflections and strains with experimental values. Five test specimens were 25.4 mm thick stiffened flange connections (with different orientations of stiffeners), three test specimens were unstiffened 25.4 mm thick flange connections, and the last two were unstiffened 19.1 mm thick flange connections---all connected by eight 25.4 mm ASTM A325 bolts. The 3-D finite element models predicted the ultimate strength of the flange connections well, matching the experimental values. A design example using T-stub analysis and yield line method is included. Using the yield line theory, the thickness required for stiffened connection is found to be 22% less than that for unstiffened connection. For the same flange thickness, stiffened connections are stronger by 68%. It is suggested that for preliminary design of flange connections, T-stub method can be used. Yield line method can then be applied for an accurate design. If necessary this can be supplemented by finite element analysis.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2003 .N34. Source: Masters Abstracts International, Volume: 42-02, page: 0639. Adviser: Murty K. S. Madugula. Thesis (M.A.Sc.)--University of Windsor (Canada), 2003.