超长混凝土结构在使用阶段温度应力下的裂缝控制  

Crack control of super-long concrete structures under temperature stress in use stage

作　　者：蒋方新 陈尚志 邵兴宇 姚张婷 刘运 郑天成 JIANG Fangxin;CHEN Shangzhi;SHAO Xingyu;YAO Zhangting;LIU Yun;ZHENG Tiancheng(China Academy of Building Research,Beijing 100013,China;China Building Technique Group Co.,Ltd.,Beijing 100013,China;Central-South Architectural Design Institute Co.,Ltd.,Wuhan 430071,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013 [2]中国建筑技术集团有限公司,北京100013 [3]中南建筑设计院股份有限公司,武汉430071 [4]北京交通大学土木建筑工程学院,北京100044

出　　处：《建筑结构》2021年第14期107-111,共5页Building Structure

基　　金：中国建筑科学研究院有限公司科研基金项目(20181802330730041)。

摘　　要：温度变化对超长混凝土结构的变形和内力存在较大的影响。结合鲁南高铁临沂北站站前广场项目,介绍了超长混凝土结构使用阶段温度应力的等效温差计算方法。利用有限元软件分析了降温温差作用下的结构内力,探讨了温度变化对超长混凝土结构的影响。根据计算结果及其结构特点,特选用缓粘结预应力技术控制温度裂缝,同时介绍了本项目其他抵抗温度应力的措施。结果表明:在使用阶段,随着结构降温温差的增大,超长结构最大温度应力呈线性增长。控制后浇带闭合时间和施加预应力是有效控制温度应力的方法。Temperature changes have a great influence on the deformation and internal forces of super-long concrete structures.Based on the Linyi North Station square project of Lunan high-speed railway,a calculation method about equivalent temperature variation of the temperture stress in the use stage of super-long concrete structure was introduced.The finite element software was used to analyze the internal force of the structure under the action of temperature drop and to discuss the influence of temperature change on the super-long concrete structure.According to the calculation results and its structural characteristics,the retard-bonded prestress technology was used to control the temperture cracks.In addition,other measures to resist the temperature stress of the project were introduced.The results show that during the use stage,as the temperature drop of the structure increases,the maximum temperature stress of the super-long structure increases linearly.Controlling the closing time of post-cast strip and applying prestress are effective methods to control temperature stress.

关 键 词：超长混凝土结构 温度应力 缓粘结预应力 裂缝控制 

分 类 号：TU378[建筑科学—结构工程]