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作 者:何树岗 唐煌 姜正荣[2] 石开荣[2] 刘小梁 He Shugang;Tang Huang;Jiang Zhengrong;Shi Kairong;Liu Xiaoliang(Power China Kunming Engineering Corporation Limited,650200,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)
机构地区:[1]中国电建集团昆明勘测设计研究院有限公司,6502002 [2]华南理工大学土木与交通学院,广州510640
出 处:《特种结构》2023年第5期1-6,19,共7页Special Structures
摘 要:混凝土框架结构对温度的变化较为敏感,易产生较大的内力与变形。基于南方美谷项目高层工业厂房,建立了混凝土框架结构的有限元模型。考虑季节温差、混凝土收缩当量温差及徐变与应力松弛的影响,采用综合温差设计方法,对其在降温作用下的结构变形与楼板温度应力进行研究。在此基础上,进行参数分析,探讨不同综合设计温差及首层层高对楼板温度应力的影响。结果表明:综合设计温差作用下,结构边缘的侧向变形及顶层的竖向变形均最大,且二层楼板的温度应力较大;随着综合设计温差和首层层高的增大,二层楼板的最大拉应力分别呈现增长和减小的趋势;设置后浇带及延长其闭合时间,均可有效降低温度作用的不利影响。Concrete frame structure is sensitive to the temperature change,which is easy to produce large stress and deformations.Based on the tall industrial building of South Meigu project,a finite element model of concrete frame structure was established.Considering the influence of seasonal temperature difference,concrete shrinkage equivalent temperature difference,creep and stress relaxation,the structural deformations and temperature stresses of floor slabs under cooling were studied by using the comprehensive temperature difference design method.On this basis,the parameter analysis was carried out to explore the influence of different comprehensive design temperature differences and heights of the first floor on the temperature stresses of floor slabs.The results showed that both of the lateral deformation at the edge and the vertical deformation at the top of the structure are maximal,and the temperature stresses of the second floor slab are large under the effect of comprehensive design temperature difference.With the increase of the comprehensive design temperature difference and the height of the first floor,the maximum tensile stresses of the second floor slab respectively present increasing and decreasing trends.Both setting the post-cast strip and delaying its closing time can effectively reduce the unfavorable effect of temperature.
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