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The following is a precis of a paper which is filed in the Institution’s library (reference X(27)). Copies of the paper are available for borrowing by members of the Institution in the United Kingdom, or they can be consulted at the Institution.
M.A. El-Gaaly and M.K. Khalifa
A field investigation of time-dependent shortening of columns and core walls in a reinforced concrete multistorey structure was recently completed by the Portland Cement Association of America. Strains were measured over a period of four years commencing during the construction period and continuing through subsequent occupation of the building. Diameter of columns, thickness of core walls, strength of concrete, and amount of reinforcement varied throughout the height of the 70-storey structure. Compressive strains at 27 different storeys were measured.
The deformational behaviour of single and multicell steel and concrete box girders is studied by reference to specific examples which incorporate variations in wall thickness, loaded length, stiffener size, diaphragm spacing, shape of section, curvature, and support positions.
J.C. Chapman, P.J. Dowling, P.T.K. Lim and C.J. Billington