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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.
Dr. Cope (University of Liverpool, Department of Civil Engineering): 'Mr. Chairman, gentlemen, the contribution I would like to give is a joint one with Professor Sawko who very much regrets not being able to attend tonight.'
The paper compares the strengths of shear connectors given in CP 117, Parts 1 and 2 with the results of recent push-out tests made at the Building Research Station. Particular attention is paid to the effect of concrete strength and density on the static and fatigue strengths of connectors. Recommendations are made for the revision of the specified strengths, the extension of the range of concrete strengths over which connector strengths are specified and the inclusion of the strengths of stud connecfors embedded in lightweight concretes.
John B. Menzies