徐变影响混合结构施工期竖向变形计算  

CALCULATION OF SHORTENING OF MIXED STRUCTURE IN CONSTRUCTION CONSIDERING CONCRETE CREEP

作　　者：陈灿[1] 徐伟[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《低温建筑技术》2007年第3期43-45,共3页Low Temperature Architecture Technology

摘　　要：研究了钢框架-钢筋混凝土核心筒混合结构体系在施工期间的竖向变形问题。在分析中提出采用龄期调整的有效模量法（AMME）考虑施工期混凝土徐变的影响，并利用超级有限元-有限元耦合理论进行施工过程的模拟。算例计算结果表明，施工完毕时核心简混凝土的徐变占到该层总变形值的38％-43％。由于混凝土的徐变，外钢框架与核心简竖向变形差异值仅为只考虑弹性变形差异值的21％。徐变增加了外框架柱的轴力。对于连接外钢框架与核心简的框架梁，徐变还使连接核心简一端的支座负弯矩减小，而对于连接外钢框架柱一端弯矩则是增加。The shortening of steel frame - reinforced concrete core - wall mixed structure during construction is analyzed in this paper. The AMME method and the super finite element theory are proposed to consider the influence of concrete creep during construction. The shorting of core - wall due to concrete creep and shrinkage will equal to 38 % - 43 % of total shorting. The influence of concrete creep on different shoring between frame and core - wall will equal to 21% of elastic calculating results. The axial forces of frame columns are increased due to creep of core - wall. The support moments of beams connecting steel frame and core - wall are influenced by creep. The beam moments of connecting core - wall end increased, the other way round which of connecting column decreased.

关 键 词：竖向变形 混合结构体系 徐变 超级有限元 

分 类 号：TU973.14[建筑科学—结构工程]