地铁车辆段超长预应力混凝土结构应力分析  

STRESS ANALYSIS OF ULTRA-LONG PRESTRESSED CONCRETE STRUCTURES IN SUBWAY VEHICLE DEPOTS

作　　者：闫浩杰 YAN Haojie(China Railway 22nd Bureau Group Track Engineering Co.,Ltd.,Beijng 100043,China)

机构地区：[1]中铁二十二局集团轨道工程有限公司,北京100043

出　　处：《低温建筑技术》2024年第8期165-168,共4页Low Temperature Architecture Technology

摘　　要：为准确获得超长混凝土温度荷载对结构变形和结构应力的影响,文中通过数值模拟分析了由温度荷载对超长结构的变形和应力的影响,在此基础上提出了施加预应力以消除温度荷载对超长结构应力的影响。由分析结果可知,由于内外环境温度差异较大,以及混凝土收缩时的当量温差,导致混凝土产生温度应力,采用“疏”与“堵”结合的方式缓解了超长结构混凝土初期水化热引起的温度应力,即在混凝土浇筑完的早期阶段,采用加强混凝土养护或设置后浇带的措施来减轻温度应力;在混凝土浇筑后期,通过预施加预应力的方法,在混凝土内部形成一种压应力,以补偿因冷却或收缩而产生的拉应力。研究为类似工程施工提供良好的工程经验。This paper analyzes the influence of temperature load on the deformation and stress of ultra-long struc⁃tures through numerical simulation.We propose a method to apply prestress to eliminate the influence of tempera⁃ture load on the stress of ultra-long structures.Due to the large temperature difference between the internal and ex⁃ternal environments,as well as the equivalent temperature difference during concrete shrinkage,temperature stress is generated in the concrete.The combination of drainage and blocking is used to alleviate the temperature stress caused by the initial hydration heat of ultra-long structural concrete.That is,in the early stage of concrete pouring,measures such as strengthening concrete curing or setting up post pouring strips are taken to reduce temperature stress.In the later stage of concrete pouring,a compressive stress is formed inside the concrete by pre stressing to compensate for the tensile stress caused by cooling or shrinkage.

关 键 词：地铁车辆段 超长混凝土结构 温度应力 当量误差 

分 类 号：TU378[建筑科学—结构工程]