混凝土收缩徐变对高层混合结构的影响及对策
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摘要
针对高层混合结构竖向变形差的计算与工程对策问题进行了研究.首先,给出了超高层混合结构竖向变形差的计算方法.在结构分析中,采用刚度逐层形成、荷载逐层施加的方法考虑施工过程的影响;根据ACI规范混凝土徐变收缩计算公式,假设构件荷载线性增加,引入平均龄期影响系数和平均持荷影响系数计算变荷载作用下混凝土的徐变和收缩.用龄期调整的有效模量法分析了构件配筋率对构件徐变的影响.分析中还考虑了核心筒超前施工的影响.然后,通过算例分析,给出了减小混合结构竖向变形差的工程对策.该法简单实用,可以在超高层混合结构设计中计算竖向变形差时使用.
This paper aims to research 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 was presented.This method took 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 were increased linearly in members,creep and shrinkage effects of members were analyzed by adopting two parameters named average load-aged coefficient and average age-last coefficient.Effects of steel ratio on members creep were analyzed by age-adjusted module method(AEMM).The effects that core-tube was constructed in advance to outer steel frame were also considered.Then,based on the sample calculation, the measures to effectively reduce different vertical displacements in hybrid-structures were proposed.This method is simple and practical in the calculation of different vertical displacements in tall and super-tall hybrid-structures.
This paper aims to research 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 was presented.This method took 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 were increased linearly in members,creep and shrinkage effects of members were analyzed by adopting two parameters named average load-aged coefficient and average age-last coefficient.Effects of steel ratio on members creep were analyzed by age-adjusted module method(AEMM).The effects that core-tube was constructed in advance to outer steel frame were also considered.Then,based on the sample calculation, the measures to effectively reduce different vertical displacements in hybrid-structures were proposed.This method is simple and practical in the calculation of different vertical displacements in tall and super-tall hybrid-structures.
引文
[1]JGJ3-2002高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.JGJ3-2002 Technical specification for concrete structures of tallbuilding[S].Beijing:China Architecture Industry Press,2002.(In Chinese)
[2]周绪红,黄湘湘,王毅红,等.钢框架-钢筋混凝土核心筒体系竖向变形差异的计算[J].建筑结构学报,2005,26(2):66-73.ZHOU X H,HUANG X X,WANG Y H,et al.Calculation ofthe differential shortening of steel frame-reinforced concrete core-wall structure[J].Journal of Building Structures,2005,26(2):66-73.(In Chinese)
[3]徐培福,傅学怡,王翠坤,等.复杂高层建筑结构设计[M].北京:中国建筑工业出版社,2005.XU P F,FU X Y,WANG C K,et al.Structural design forcomplex tall buildings[M].Beijing:China Architecture IndustryPress,2005.(In Chinese)
[4]杨丽,郭志恭.高层钢筋混凝土结构设计中如何考虑收缩、徐变的作用「J].工业建筑,1995,25(4):40-46.YANG L,GUO Z G.How to consider the effect of creep andshrinkage in reinforced concrete tall building structure design[J].Industrial Construction,1995,25(4):40-46.(In Chinese)
[5]邓志恒,秦荣.考虑施工过程收缩徐变对高层建筑结构影响理论分析[J].哈尔滨建筑大学学报,2002,35(5):28-31.DENG Z H,QIN R.Influence of shrinkage and creep on high-risebuilding in construction process[J].Journal of Harbin University of CE&Architecture,2002,35(5):28-31.(In Chinese)
[6]罗文斌,张保印.超高层建筑S+RC混合结构竖向变形差的工程对策[J].建筑结构学报,2000,21(6):68-73.LUO W B,ZHANG B Y.Countermeasures for different verticaldeformation of S+RC mixed structures[J].Journal of BuildingStructures,2000,21(6):68-73.(In Chinese)
[7]MARU S,ASFAW M,NAGPAL A K.Consistent procedure forcreep and shrinkage effects in RC frames[J].Journal of StructuralEngineering,2001,127(7):726-732.
[8]SHARMA R K,MARU S,NAGPAL A K.Simolified procedurefor creep and shrinkage effects in reinforced concrete frames[J].Journal of Structural Engineering,2004,130(10):1545-1552.
[9]史密斯B S,库尔A.高层建筑结构分析与设计[M].北京:地震出版社,1993:524-539.SMITH B S,KUER A.Structural analysis and design of tallbuildings[M].Beijing:Earthquake Press,1993:524-539.(InChinese)
[10]ACI Committee 209.Prediction of creep,shrinkage,and temper-ature effects in concrete structures[M].Detroit:ACI,1992.
[11]夏心红,沈蒲生,方辉,等.钢筋混凝土轴压构件分批加载时收缩徐变分析的简化方法[J].华中科技大学学报:城市科学版,2006,23(4):48-50.XIA X H,SHEN P S,FANG H,et al.Simplified method of creepand shrinkage analysis in reinforced concrete members bearing multi-axial forces[J].Journal of Huazhong University of Science and Tech-nology:Urban Science Edition,2006,23(4):48-50.(In Chinese)
[2]周绪红,黄湘湘,王毅红,等.钢框架-钢筋混凝土核心筒体系竖向变形差异的计算[J].建筑结构学报,2005,26(2):66-73.ZHOU X H,HUANG X X,WANG Y H,et al.Calculation ofthe differential shortening of steel frame-reinforced concrete core-wall structure[J].Journal of Building Structures,2005,26(2):66-73.(In Chinese)
[3]徐培福,傅学怡,王翠坤,等.复杂高层建筑结构设计[M].北京:中国建筑工业出版社,2005.XU P F,FU X Y,WANG C K,et al.Structural design forcomplex tall buildings[M].Beijing:China Architecture IndustryPress,2005.(In Chinese)
[4]杨丽,郭志恭.高层钢筋混凝土结构设计中如何考虑收缩、徐变的作用「J].工业建筑,1995,25(4):40-46.YANG L,GUO Z G.How to consider the effect of creep andshrinkage in reinforced concrete tall building structure design[J].Industrial Construction,1995,25(4):40-46.(In Chinese)
[5]邓志恒,秦荣.考虑施工过程收缩徐变对高层建筑结构影响理论分析[J].哈尔滨建筑大学学报,2002,35(5):28-31.DENG Z H,QIN R.Influence of shrinkage and creep on high-risebuilding in construction process[J].Journal of Harbin University of CE&Architecture,2002,35(5):28-31.(In Chinese)
[6]罗文斌,张保印.超高层建筑S+RC混合结构竖向变形差的工程对策[J].建筑结构学报,2000,21(6):68-73.LUO W B,ZHANG B Y.Countermeasures for different verticaldeformation of S+RC mixed structures[J].Journal of BuildingStructures,2000,21(6):68-73.(In Chinese)
[7]MARU S,ASFAW M,NAGPAL A K.Consistent procedure forcreep and shrinkage effects in RC frames[J].Journal of StructuralEngineering,2001,127(7):726-732.
[8]SHARMA R K,MARU S,NAGPAL A K.Simolified procedurefor creep and shrinkage effects in reinforced concrete frames[J].Journal of Structural Engineering,2004,130(10):1545-1552.
[9]史密斯B S,库尔A.高层建筑结构分析与设计[M].北京:地震出版社,1993:524-539.SMITH B S,KUER A.Structural analysis and design of tallbuildings[M].Beijing:Earthquake Press,1993:524-539.(InChinese)
[10]ACI Committee 209.Prediction of creep,shrinkage,and temper-ature effects in concrete structures[M].Detroit:ACI,1992.
[11]夏心红,沈蒲生,方辉,等.钢筋混凝土轴压构件分批加载时收缩徐变分析的简化方法[J].华中科技大学学报:城市科学版,2006,23(4):48-50.XIA X H,SHEN P S,FANG H,et al.Simplified method of creepand shrinkage analysis in reinforced concrete members bearing multi-axial forces[J].Journal of Huazhong University of Science and Tech-nology:Urban Science Edition,2006,23(4):48-50.(In Chinese)
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