超长地下结构降低温度应力设计方法  

Design Method for Reducing Temperature Stress of Super Long Underground Structure

作　　者：姜文辉 何诚 JIANG Wenhui;HE Cheng(Architecture Design&Research Institute of Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《结构工程师》2023年第4期193-199,共7页Structural Engineers

摘　　要：随着地下空间开发的需要,地下结构不设缝长度不断突破,当超长地下结构在收缩等效温差与季节温差叠加下的应力可能会超过混凝土的抗拉强度时,可采用增加普通钢筋、增设预应力钢筋或掺加抗裂纤维等方法抵抗温度应力,也可在充分研究温度应力成因与分布规律后,在设计中主动采取降低温度应力的设计方法以降低温度应力、有效控制裂缝的出现和发展、节约工程造价。以某超500 m长地下工程为例,介绍了降低温度应力设计方法和构造措施,在满足裂缝控制要求下,取得了较好的经济效益。With the needs of underground space development,the length of underground structure without joint continues to break through,when the stress of super long underground structure under the superposition of shrinkage equivalent temperature difference and seasonal temperature difference may exceed the tensile strength of concrete,it is necessary to resist temperature stress by increasing reinforcement,adding prestressed rebar or crack-resisting fibers.After investigating the cause and distribution of temperature stress,using proper design method may also reduce temperature stree,effectively control the occurrence and development of cracks,and reduce project cost.Taking a 500-meter-long underground project as an example,this paper introduces a design method and structural measures to reduce temperature stress,which has achieved good economic benefits under the condition of meeting the requirements of crack control.

关 键 词：超长地下结构 季节温差 降低温度应力设计方法 

分 类 号：TU93[建筑科学—结构工程]