【作者】 冯欢；

【导师】 张仲先；

【作者基本信息】 华中科技大学 ， 结构工程， 2017， 硕士

【摘要】 对于筒中筒结构,外框筒常布置3~4 m的柱距,通常需要在结构局部抽掉外框筒底部几层的若干柱来为建筑提供较大的出入口。规范要求,对复杂高层结构应进行施工模拟计算以考虑施工过程的影响。基于此,本文对一带局部斜撑转换层的筒中筒结构进行了施工模拟分析,探讨相关规律,对此类复杂高层结构的设计和施工具有重要的实际意义。本文采用ETABS有限元分析软件来进行相关的施工模拟计算,主要研究内容如下:在结构的施工阶段,比较了“一次加载法”和“模拟施工过程加载法”的内力和变形计算结果并分析了混凝土龄期、收缩和徐变效应对结构内力和变形的影响;在结构的准使用阶段,分析了收缩和徐变效应在七个时间段内的发展规律,分别分析其对结构竖向变形的影响;最后本文还研究了墙、柱竖向变形差,分析研究了减小该变形差的工程对策。通过本文的分析研究,得出了如下结论:对于带转换层等的复杂高层结构,进行施工模拟分析是必要的,以免低估重要构件在自重荷载作用下的计算内力,带来安全隐患;在进行施工模拟计算时,必须考虑混凝土收缩、徐变的影响;结构封顶后,收缩和徐变效应持续对结构产生影响,结构封顶后第三年底时,对于最大变形楼层处的竖向构件,收缩和徐变引起的变形量是恒荷载产生的变形量的2.8左右,此时墙、柱的竖向变形差峰值出现在结构顶部楼层附近;可以从材料、设计和施工三个方面来寻求减小墙、柱竖向变形差的对策。更多还原

【Abstract】 For tube-in-tube structures,due to the 3~4 meters of column spacing of the outer frame tube,designers usually partially remove some columns of the frame tube at bottom storeys to provide a large entrance to the building.The design code requires that construction simulation analysis for complex high-rise structures must be executed to considering the effects of construction process.Based on this,this thesis carrys out construction simulation analyses on a tube-in-tube structure with partial transfer storey of diagonal brace and discusses the relevant laws which have certain reference significances to the design and construction of this kind of complex high-rise structures.This thesis carrys out construction simulation analyses by using ETABS and it is divided into two mainly parts: 1.During construction,the internal force and deformation calculation results of the structure are compared when ETABS uses the calculation method of once loading and the calculation method of construction simulation loading.The effects of concrete age,shrinkage and creep on the internal forces and deformations of the structure are analyzed;2.During quasi-use,the developments of shrinkage and creep in seven time periods are analyzed and the effects of shrinkage and creep on the vertical deformation of the structure are analyzed.At last,the thesis studies the deformation difference between columns and shear walls and discusses the strategies for reducing this difference.By the research of this thesis,the conclusions are as follows: For complex high-rise structures,carrying out construction simulation analyses is necessary in order to avoid underestimating the internal force calculation results of important components of the structure which are the keys to the structure safety;The effects of shrinkage and creep must be taken into consideration when carrying out construction simulation analyses;After the completion of the structure,shrinkage and creep continue to affect the structure.By the end of the third year after structure completion,for vertical components of the maximum deformation storey,the deformation caused by shrinkage and creep is about 2.8 times of the deformation caused by constant load and at this time,the peak value of deformation difference between columns and shear walls appears in the top storey of the structure;We can seek to reduce the difference from the three aspects of material,design and construction.更多还原