| Title: | TIME DEPENDENT DIFFERENTIAL SHORTENING OF REINFORCED CONCRETE COLUMNS IN TALL BUILDINGS |
| DOI No: | 10.1142/9789812701480_0015 |
| Source: | TALL BUILDINGS (pp 90-96)
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| Author(s): | K. W. LEE
Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
S. H. LO
Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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| Abstract: | Columns under various magnitudes of load are not uncommon in tall buildings. Resulting from differential loads, uneven shortening of two adjacent columns will induce moment, shear and crack in the connecting slab or beam. The magnitude of this induced moment, shear and crack will increase with time due to the effects of creep and shrinkage. As the creep strain depends on the magnitude of the load, the higher is the load applied to the column, the more is the shortening. In this paper, a systematic time dependent analysis method will be introduced to investigate this problem. This method, which is developed on the concept of age adjusted effective modulus approach, accounts for not only the material nonlinearities but also the geometric nonlinearities of the structural members. Time step analysis is implemented in the analysis in order to simulate the loading situation of typical constructions. Numerical results are analyzed and compared to previously published results by other researchers. |
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