Very little guidance exists on the design of steel column base connections for biaxial flexure combined with axial
compression. This study aims to develop a design method for designing these connections for combined loading.
To this end, an extensive experimental programme that consisted of 32 tests to failure, was carried out. The
programme varied plate thickness, holding-down bolt diameter, axial force level and loading angle. Ancillary
tests were carried out to establish material strengths and to assess the importance of bond to the design of the
connection. The programme was augmented with detailed finite element analyses that were calibrated with the
experimental results.
It was found that the contribution of bond to the final anchorage strength of the connection is negligible and should
be ignored. Very little concrete damage was observed during the experimental phase and current design guidance
for concrete bearing strength is very conservative. Increases in plate thickness, holding-down bolt diameter and
axial force were found to increase the connection strength. Increases in loading angle, from strong-axis to weakaxis
bending were found to decrease connection strength. Furthermore, the plate thickness and holding-down bolt
parameters were found to be interdependent. Increases in axial compression were found to increase the initial
connection stiffness.
Finally, a new mechanical model is proposed for designing base connection. The model enables the construction
of thrust-moment interaction diagrams that can be used directly for design. A shortened listing of the source code
used to generate the interaction curve in this work is included in the Appendix. / Thesis (PhD)--University of Pretoria, 2018. / Computer Science / PhD / Unrestricted
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:up/oai:repository.up.ac.za:2263/67812 |
| Date | January 2018 |
| Creators | Mohiuddin, Aijaz |
| Contributors | Engelbrecht, Andries P., waseem_aijaz@yahoo.com, Khan, S.A. (Salman Ahmad) |
| Publisher | University of Pretoria |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
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