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考虑收缩徐变的施工分析对528m超高层塔楼巨柱类型选择的影响 被引量:4

Influence of the mega column selection for 528m super tall tower considering creep and shrinkage construction analysis
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摘要 相较于型钢混凝土(SRC)巨柱,钢管混凝土(CFT)巨柱具有极小的收缩效应的特点,同时徐变变形也相应偏小。以南宁东盟塔的设计实践为例,通过进行考虑时间相关的混凝土收缩徐变的非线性施工分析,对采用不同巨柱类型的塔楼施工变形补偿进行了预测。塔楼混凝土核心筒和外框柱随时间变化的弹性变形、收缩变形和徐变变形根据GL2000收缩徐变模型进行计算。分析方法为设计团队自行开发的程序与ETABS(2015版)相结合的形式。通过该方法,带外伸桁架的巨柱超高层结构的施工完毕后的核心筒及巨柱的内力随时间的变化趋势被预测出来,另外,外框与核心筒之间的随时间变化的相对变形也被计算预测出来。这些结果对采用SRC巨柱和CFT巨柱的不同结构方案的不同构件的加强措施提供了重要依据。 Compared with steel reinforced concrete( SRC) mega columns,concrete-filled-tube( CFT) mega columns only have minimal shrinkage effect,and creep effect is appropriately less.Per the practice as Nanning ASEAN Tower,time dependent creep and shrinkage nonlinear construction sequence analysis was studied to predict the construction deformation compensation of the tower in term of different mega column types.The time dependent elastic deformation,shrinkage deformation and creep deformation of concrete core and perimeter frame columns of the tower are calculated based on GL2000 creep and shrinkage model.The analysis is performed by combining the self-developed program of design team and ETABS V2015.The time dependent force changes at central core and mega columns after the construction completion were predicted in term of this approach,in additional,the time dependent differential shortenings between core and perimeter frame were figured out.These results are the important criteria of the different enhancement measures of structural components for the different structural system with SRC mega column and CFT column respectively.
作者 陈晋 丁晗 邓岚青 威廉贝克 Chen Jin;Ding Han;Dane Rankin;William Baker(Skidmore,Owings & Merrill LLP,Chicago 60604,US)
出处 《建筑结构》 CSCD 北大核心 2018年第17期52-59,共8页 Building Structure
关键词 南宁东盟塔 超高层结构 收缩 徐变 外伸桁架 巨柱 GL2000 非线性施工分析 Nanning ASEAN Tower super tall building shrinkage creep outrigger mega column GL2000 nonlinear construction sequence analysis
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