Effect of Creep and Shrinkage on Construction Sequence Analysis of High-Rise Building

Abstract

AbstractConsideration of the construction sequence of buildings will significantly change the internal forces of the structural members, especially for long span and super high-rise structures. The internal forced leads the assessment of elasto-plastic performance of building structures under earthquakes. In tall reinforced concrete building, the axial shortening of vertical members due to creep and shrinkage is non-avoidable. In design and construction of tall structures, it is necessary to pay attention for the effect of axial shortening. Mainly calculation of axial shortening is critical due to many parameters involved, viz. incorporates the grade of concrete, volume/surface ratio, sequence of construction, creep and shrinkage coefficients, and this task is not that much easy. The construction stage analysis has been carried out on fifty, sixty-five and eighty-storey building using effect of creep and shrinkage. The vertical member displacement results are compared with conventional dynamic analysis. The analysis is done for two different seismic zones, and the effect of humidity over the axial shortening is been determined. In dynamic analysis, the entire structure is considered as a lumped mass. Present study helps to understand the variation of structural load responses in construction sequence and dynamic analysis, respectively. Also the effect of creep and shrinkage after three years on the construction sequence analysis has been determined.KeywordsElasto-plasticDynamic analysisConstruction sequential analysisCreepShrinkage