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Column Shortening in Tall Buildings : Prediction and Compensation [MF]

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S.K. Ghosh, and Hal Iyengar Mark Fintel (Author)
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Description: This design aid deals with the effects of elastic and inelastic column shortening in tall buildings. Discusses strains in columns, overall column shortening, relative shortening between adjacent vertical members--all caused by elastic stresses, shrinkage, creep; and methods of compensation for differential shortening of vertical members in tall concrete and composite buildings.
A computerized procedure for prediction of elastic and inelastic column length changes in tall buildings has been developed, which is applicable to concrete and composite structures. The procedure is presented and illustrated through practical examples. Idealizations of the elastic behavior, shrinkage, and creep of concrete that were used in the computerized procedure are discussed. The proposed procedure is verified against laboratory test results as well as against field observations. Differential column length changes computed through the proposed analytical procedure can and should be compensated for during construction. Compensation techniques, which must vary with the type of structural system used, are suggested.

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