非荷载因素对超高层结构变形的影响研究  

STUDY OF THE INFLUENCE OF SHRINKAGE, CREEP AND TEMPERATURE DIFFERENCE ON SUPER HIGH-RISE STRUCTURAL DEFORMATION

作　　者：董志君[1,2,3] 李筱毅 阎培渝[1] 欧阳蓉 

机构地区：[1]清华大学土木工程安全与耐久教育部重点试验室,北京100084 [2]广东省滨海土木工程耐久性重点实验室,深圳518060 [3]深圳地铁集团有限公司,深圳518024 [4]深圳市轨道交通建设指挥部办公室,深圳518024 [5]深圳市市政设计院有限公司,深圳518024

出　　处：《工程力学》2013年第B06期165-168,190,共5页Engineering Mechanics

基　　金：国家重点基础研究发展计划项目(2011CB013604);国家杰出青年科学基金项目(50925829)

摘　　要：影响超高层结构变形的非直接荷载因素主要是混凝土的收缩和徐变、结构向阳面和背阳面的温度差异。而影响结构变形的直接荷载因素有自重、活荷载、风荷载等。针对地处中国深圳地区的某高度为441.8m的超高层结构进行了精细的施工过程模拟分析,研究了非荷载因素对超高层结构变形的影响程度。分析结果表明:施工过程模拟考虑逐层找平时,结构竖向位移发生在结构中部,最大位移为58.4mm,不考虑逐层找平;竣工时最大位移发生在结构顶层,最大位移为103mm;结构竣工600天后,最大位移为122mm;各施工阶段由收缩徐变引起的结构变形占总徐变变形的30%左右。风荷载引起的结构侧向变形为剪切型变形,而温差引起的侧向变形为弯曲性变形,因此温差引起变形与风荷载引起变形的比例,随着高度的增加而增大。50年一遇的风荷载作用下,结构顶部位移达到1752mm,温差为30℃时,结构顶部侧向位移达到701mm,占风荷载引起变形的40%。The indirect load factors that influence super high-rise structural deformation mainly include the shrinkage, creep of concrete, as well as the temperature difference between the sunny side and sunless side of a structure. And the direct load factors influencing the deformation of a structure include its dead weight, live load, wind load, etc. The analysis was carried out for the refined construction process simulation of a super high-rise structure in China Shenzhen with a height of 441.8m, and the research was done on the influence degree of non direct load factors on super high-rise structural deformation. Analysis result shows that： when level finding storey by storey is considered during construction stage simulation, the vertical displacement of the structure occurs in the middle storey of the structure, with max displacement of 58.4mm. Without considering the layer-by-layer leveling, the final max displacement occurs in the top storey of the structure, with max displacement of 103mm. After 600 days since structure completion, the max displacement is 122mm, and the structural deformation of each construction stage caused by shrinkage creep takes up about 30% of the total deformation. The structural lateral deformation caused by wind load is of shearing type, while the lateral deformation caused by temperature difference is bending deformation. Thusly, the proportions of deformation caused by temperature difference and wind load are becoming greater and greater with the increase of height. Under the influence of wind load which might occur once in 50 years, the displacement at the top of structure can reach 1752mm, and lateral displacement at the top of structure can reach 701mm when temperature difference is 30℃, accounting for 40% of the deformation caused by wind load.

关 键 词：超高层结构 施工过程模拟 风荷载 收缩徐变 温差 

分 类 号：TU391[建筑科学—结构工程] TU392.5