Effects of Column Shortening in Tall R.c. Buildings
نویسندگان
چکیده
In tall and very tall reinforced concrete buildings, long term column shortening due to creep and shrinkage affects the service life behavior of structural elements. Creep-induced column shortening depends on the axial stress level in the column cross sections and on its evolution in time. For this reason, the construction method and phases must be taken into account as a key factor in defining the evolution of the stresses. If approached in its comprehensive theoretical formulation, the problem of column shortening in tall buildings exhibits high computational and analytical complexity, because the different construction phases must be taken into account, together with the loading history and the rheological non-homogeneity of the different concrete elements at the times when loading is applied. Anyway, to approach the general problem more easily, a few assumptions can be made allowing to derive, by means of simplified calculations, the upper and lower boundaries of the exact general analytical solution. In the present paper, at first, the problem of long time column shortening will be discussed, then approximate solutions will be derived and applied with reference to the case study of Palazzo Lombardia, at present the tallest building in Italy.
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