超长地下室板柱结构温度应力分析与抗裂技术研究  

Study on Temperature Stress Analysis and Anti-Cracking Technology of Slab-Column System in Ultra-Long Basement

作　　者：张君蓉 ZHANG Junrong(China Railway Construction Group Co.Ltd.,Beijing 100040,China)

机构地区：[1]中铁建设集团有限公司,北京100040

出　　处：《铁道建筑技术》2023年第8期25-28,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(2018-B08)。

摘　　要：地下室施工期间,即在上部结构及覆土未完成前,地下室结构受太阳辐射、气温变化等因素影响。温度作用作为非荷载影响因素,易引起混凝土结构产生裂缝。对于超长地下室板柱结构裂缝的产生,更易受到温度应力和混凝土收缩影响。本文结合工程实例,基于有限元方法分析施工期间混凝土收缩、温度作用对超长地下室板柱结构裂缝产生及发展影响程度。结果表明,控制收缩变形和温度应力是预防楼板裂缝的关键;超长地下室板柱结构后浇带部位钢筋连接形式对结构裂缝的产生有很大影响。本研究成果对类似工程结构抗裂方案编制、施工指导以及后浇带节点设计等具有现实指导意义。During the construction of the basement,that is,before the superstructure and soil covering are completed,the basement structure is affected by solar radiation,temperature change and other factors.As a non-load influencing factor,the temperature effect will cause cracks in concrete structures.Temperature stress and concrete shrinkage are more likely to affect the cracking of slab-column system in ultra-long basement.Combining with engineering examples,this paper analyzes the influence degree of concrete shrinkage and temperature effect on the generation and development of cracks of slab-column system in ultra-long basement during construction by finite element method.The research shows that the key to prevent floor cracks is to control its shrinkage deformation and temperature stress;the connection form of steel bars at the post-cast belt of the ultra-long basement slab-column structure has many effects on the crack generation.The research results have practical guiding significance for the formulation of anti-cracking scheme,construction guidance and the design of post-cast belt joints of similar engineering structures.

关 键 词：超长地下室 板柱结构 温度应力 后浇带 数值分析 抗裂技术 

分 类 号：TU528.01[建筑科学—建筑技术科学] TU93