摘要
由于荷载的增加和混凝土的收缩徐变,超高层建筑在施工过程中会产生附加内力和变形,有必要对结构展开施工监测。通过对某超高层建筑开展为期680d的施工监测,研究施工过程中钢管混凝土柱与钢筋混凝土剪力墙的应变发展规律;同时,利用有限元方法分析了主体结构封顶后竖向变形的分布特点与成因。研究表明,随着时间的增加,同一楼层的钢管混凝土柱竖向应变增量明显大于剪力墙,但各构件的应变增量处于可控范围内;由混凝土徐变引起的钢管混凝土柱和钢筋混凝土剪力墙的竖向变形最多分别可达总变形的29.9%和33.5%,徐变引起的结构变形应予以充分重视。
Due to the increase of load and the shrinkage and creep of concrete during construction,additional internal forces and deformation will produce in high-rise buildings,which makes the construction monitoring necessary for them.Construction monitoring for 680 days were performed on a high-rise building to evaluate the strain development laws of concrete filled steel tubes( CFST) columns and reinforced concrete( RC) shear walls during construction. In addition,distribution characters and causes of vertical deformation of the building were analyzed used the finite element method after the main building sealed roof. Studies show that strain increments of the concrete filled steel tube columns are apparently greater than those of RC shear walls over time. However,the strain increments of all the members are still under control. The proportions of deformation due to concrete creep are up to 29. 9% and 33. 5% of the total deformation for the CFST columns and RC shear walls,respectively. Full attention should be paid to structural deformation caused by concrete creep.
出处
《施工技术》
CAS
北大核心
2017年第S1期1179-1182,共4页
Construction Technology
基金
广西自然科学基金项目(2015GXNSFAA139273)
关键词
高层建筑
施工监测
徐变
附加变形
tall buildings
construction monitoring
creep
additional deformation
