【作者】 贺世伟；

【导师】 潘文；

【作者基本信息】 昆明理工大学 ， 防灾减灾工程及防护工程， 2010， 硕士

【摘要】 随着高层建筑发展,钢框架-混凝土核心筒混合结构体系的应用日益增多。混合结构体系能充分发挥钢材与混凝土两种材料的特性,受力合理,抗震性能良好。但是,随着建筑高度的不断增高,施工期间结构体系的变形问题也逐渐凸显出来。这一问题不仅影响施工方案制定和施工质量控制,还关系到结构体系本身的安全。对变形问题进行研究,能够提高高层建筑结构的设计与施工水平。以江东和谐世纪工程的60层框架-混凝土核心筒混合结构体系为对象,进行了施工期间的竖向变形分析。在计算中考虑了混凝土的时变性、核心筒领先外框架施工,以及加强层不同封闭时段等因素。计算表明,由于柱子名义轴压比(ε。=N0/EA)较墙体大,因此竖向位移较大；传统的一次加载计算模式没有考虑施工期间的逐层找平,因此承重构件的竖向位移呈递增规律,而阶段加载中考虑了施工期间的逐层找平,因此承重构件的竖向位移呈现出“顶、底部层小,中间部层大”的随层变化规律；施工结束时,混凝土筒体的弹性变形占到总竖向变形的比例在70%左右,而徐变变形约占25%、收缩变形约占5%；外框架柱承担大部分竖向荷载,其累积弹性竖向变形要大于核心筒,但混凝土的徐变、收缩减少了竖向变形差异水平。因此,在施工时让核心筒先行施工若干楼层以使混凝土的收缩徐变尽早开始发展,能有效减小受力体系间竖向变形差异；考虑加强层不同封闭方案,最后采用立即封闭模式待建筑装修后再对加强层进行封闭。更多还原

【Abstract】 With the development of high-rise buildings, more and more steel frame-concrete corewall mixed structures are applied. This kind of structure can take full advantage of steel and concrete, and the anti-vibration ability is excellent. But with tall building getting higher, a problem brought by deformation during construction is getting more serious.The problem influences the construction and the safty of the structure.A vertical deformation analysis on the 60-story mixed structure of Jian Dong Project was performed. The time-varying performance of concrete, the progress of corewall leading construct ahead, and different fixed schemes of strengthened stories were considered. The calculating results indicate that the deformation of frame column was larger than that of corewall, for larger nominal axial compression ratio(ε0=N0/EA). Due to the compensation in constructure, the cumulate shorting at middle floor was lager than that at bottom and top floor. The elastic shorting account for 70% of total deformation at end of construction. Meanwhile, the proportion of creep and shrinkage were respectively 25% and 5%. And the shrinkage and creep of concrete decrease the differential deformation level between corewall and column. Therefore, the leading construction of corewall can put development of shrinkage and creep ahead, and decrease the differential level. Three kinds of fixed schemes for strengthened storie were analysed, then the proper scheme was proposed.更多还原