考虑混凝土徐变收缩的超高层偏心核心筒-框架结构水平变形和结构内力分析  

Analysis of Horizontal Deformation and Internal Force of Super High-Rise Frame-Eccentrical Core Tube Structure Considering Creep and Shrinkage of Concrete

作　　者：鲁正[1] 周映旻 王远航 王超[3] 张富文[3] LU Zheng;ZHOU Yingmin;WANG Yuanhang;WANG Chao;ZHANG Fuwen(Department of Disaster Mitigation for Structures,Tongji University,Shanghai 200092,China;The First Construction Co.,Ltd.,of China Construction Third Engineering Bureau Group,Wuhan 266100,China;Shanghai Research Institute of Building Sciences Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]同济大学结构防灾减灾工程系,上海200092 [2]中建三局集团第一建设有限责任公司,武汉266100 [3]上海市建筑科学研究院有限公司,上海200032

出　　处：《结构工程师》2023年第3期1-8,共8页Structural Engineers

基　　金：国家重点研发项目(2020YFB1901402);上海市优秀学术带头人计划(20XD1423900);中央高校基本科研业务费专项资金资助(11080)。

摘　　要：核心筒偏置的框架-核心筒结构在平面上不对称,可能在水平方向产生较大的不利变形。采用混凝土徐变收缩B3模型,在ETABS中对某偏心核心筒-框架结构进行施工分析,计算了结构在不同时期的水平变形,并分析了水平变形对结构内力的影响。计算中考虑了钢管混凝土柱中钢管的环箍效应,以及钢管与混凝土的应力重分布、施工工序等因素。计算结果表明,偏心核心筒-框架结构的水平变形沿结构高度呈“中间大、两头小”分布。研究结果显示徐变和收缩引起的水平变形随时间明显增加,部分幅值在后期大于弹性变形;合理规划施工顺序可有效降低结构构件内力。通过与实测数据的对比,验证了所用模型的准确性。The frame-eccentrical core tube structure is asymmetric in plane and may produce large adverse deformation in horizontal direction.The B3 model of concrete is used to analyze the construction of a frameeccentrical core tube structure in ETABS.The structural horizontal deformation in different periods is calculated and the influence of horizontal deformation on the internal force of the structure is analyzed.The hoop effect of steel tube in CFST column,the stress redistribution between steel tube and concrete and the construction sequences are considered.The calculation results show that the horizontal deformation of the eccentric core-frame structure is large in the middle and small at both ends along the structural height.The results show that the horizontal deformation caused by creep and shrinkage increases obviously with time,and their amplitude will be larger than the elastic deformation in partial components in the later stage;besides,the results also show that reasonable planning for construction sequence can effectively alleviate the internal force of structural members.The accuracy of the model is verified by comparing with the measured data.

关 键 词：高层结构 水平变形 徐变收缩 施工分析 

分 类 号：TU973.17[建筑科学—结构工程]