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On the time dependent axial shortening of tall concrete buildings with framing action

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Gardner, Mark(Mark Alan) (2004) On the time dependent axial shortening of tall concrete buildings with framing action. PhD thesis, University of Tasmania.

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Abstract

Long term axial shortening in a tall concrete structure is a second-order effect that is of
some impediment to the serviceability, and in some cases, structural integrity of the
building. The research here involves analysis of axial shortening elements that interact
through framing action. In many tall concrete buildings framing is inherent as columns,
beams and floors are quite often connected with rigid connections. The mechanics of
differential axial shortening and framing action due to rigid connections causes load
sharing between vertical elements that fundamentally affects the degree of both absolute
and differential axial shortening. Evaluation of axial shortening by analysis of a
structural system consisting of discrete elements over-predicts the level of axial
shortening when framing is present.
A methodology to calculate axial shortening, accounting for load sharing of axial loads
for tall concrete buildings, is developed. The application of this methodology to the
construction of a tall concrete building allowing for the building cycle is presented. A
program is written that incorporates both the methodology and its application to a tall
building, using the ACT concrete creep and shrinkage models. Correlation of the
program is made against an existing previously tested program that does not allow for
framing action. A comparison is made between the two sets of data for an actual 85
storey building. From this it is concluded that;
i) Framing action reduces the differential axial shortening between two elements
ii) The core generally experiences less change to axial shortening than columns
iii) The effect of framing cannot be estimated by a relative percentage adjustment
applied uniformly to each storey.

Item Type: Thesis (PhD)
Keywords: Columns, Concrete, Concrete, Concrete, Tall buildings
Copyright Holders: The Author
Copyright Information:

Copyright 2004 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Available by loan through contact with the University of Tasmania and is limited by its subsequent use to the Copyright Act 1968. Thesis (Ph.D.)--University of Tasmania, 2004. Includes bibliographical references

Date Deposited: 09 Dec 2014 00:16
Last Modified: 11 Mar 2016 05:54
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