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Title: Measured and Predicted Long-Term Deformation: In a Tall Concrete Building

Author(s): Stephen L. Bakoss, Alan Burfitt, Les Cridland, and Jack L. Heiman

Publication: Symposium Paper

Volume: 86


Appears on pages(s): 63-94

Keywords: axial loads; creep properties; deformation; high-rise buildings; long-time study; measurement; measuring instruments; post-tensioning; precast concrete; reinforced concrete; shrinkage.

Date: 8/1/1985

A 120m tall building incorporating both in-situ and precast post-tensioned concrete components was instrumented to observe some aspects of its structural behaviour. The instrumentation was commenced more than ten years ago, it includes embedded and surface strain and temperature transducers, survey reference points, wind pressure tappings, and anemometers above the roof of the building to measure wind characteristics. The paper describes the strain and deformation instrumentation and method of data acquisition. The measured long-term vertical strains and deformations in one of the columns are presented and are compared with values predicted by two methods which are suitable for use by designers. Reference is made to the results of an extensive materials testing programme the results of which enabled the assessment of methods of prediction for the long-term creep and shrinkage properties of the concrete.


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