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It is well known that if a concrete beam be loaded a number of times to the same load the deflections will diminish with the number of repetitions of the load and the permanent set will increase with the number of loadings. Within considerable ranges of stress however the deflection will soon become constant. Beyond certain stresses and given time it is also well known that creep takes place and further that changes of form may take place due to creep. During a first loading the modulus of elasticity does not remain constant, but after a certain number of loadings within certain ranges of stress a straight line load-deflection curve is obtained in ordinary times of loading. A number of workers have shown that when a concrete beam has been loaded a considerable number of times to specified maximum stresses the static breaking load of the beam is not affected.
Emeritus Professor F. C. Lea
Few buildings of any magnitude are completed without some feature of particular interest occurring during their construction. More often than not structural problems are dealt with and forgotten, without any record having been made of them. The author therefore hopes that, in presenting a few brief descriptions of buildings recently erected, a useful purpose may be served by recording some of these problems and the manner of dealing with them.
L. Scott White