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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 234-239
Effect of concrete creep and shrinkage on tall hybrid-structures and its countermeasures
Pusheng SHEN(), Hui FANG, Xinhong XIA
College of Civil Engineering, Hunan University, Changsha 410082, China
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This paper aims to study the different vertical displacements in tall hybrid-structures and the corresponding engineering measures. First, the method to calculate the different vertical displacements in tall hybrid-structures is presented. This method takes into account the effects of construction process by applying loads sequentially story by story. Based on the concrete creep and shrinkage calculation formula in American Concrete Institute (ACI) code, with the assumption that loads are increased linearly in members, the creep and shrinkage effects of members are analyzed by adopting two parameters named average load-aged coefficient and average age-last coefficient. The effects of steel ratio on members creep are analyzed by age-adjusted module method (AEMM). The effects that core-tube were constructed in advance to outer steel frame were also considered. Then, based on the sample calculation, the measures to effectively reduce the different vertical displacements in hybrid-structures are proposed. This method is simple and practical in the calculation of different vertical displacements in tall and super-tall hybrid-structures.

Keywords creep      shrinkage      construction process      hybrid-structure     
Corresponding Author(s): SHEN Pusheng,   
Issue Date: 05 June 2009
 Cite this article:   
Pusheng SHEN,Hui FANG,Xinhong XIA. Effect of concrete creep and shrinkage on tall hybrid-structures and its countermeasures[J]. Front Arch Civil Eng Chin, 2009, 3(2): 234-239.
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Pusheng SHEN
Xinhong XIA
Fig.1  Sketch map of core-tube constructed in advance
Fig.2  Plane of hybrid structure
columns cross size/mm800×800×50800×800×40800×800×30
beam cross size/mm700×240×18×22700×240×18×22700×240×18×22
shear wall thickness/mm450350250
concrete gradeC50C40C30
Tab.1  Cross-section sizes of members
Fig.3  Vertical displacements of shear-wall
Fig.4  Different vertical displacements between column A and shear-wall B
Fig.5  Variation of vertical displacements of concrete creep and shrinkage of shear-wall B with steel ratio
Fig.6  Vertical displacements of concrete creep and shrinkage of shear-wall B when core-tube constructed stories in advance
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