考虑收缩徐变混凝土水化放热仿真分析在跳仓法施工中的应用
Application of hydration heat release simulation analysis of concrete considering shrinkage and creep in construction of alternative bay method
李坤 1毕传珠 2张元植 1吕致兴1
作者信息
- 1. 四川省建筑科学研究院有限公司,四川 成都 610081
- 2. 四川省建筑工程质量检测中心有限公司,四川 成都 610081
- 折叠
摘要
从混凝土强度、弹性模量时变模型及收缩徐变模型入手,对比分析了《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362-2018)模型、《大体积混凝土施工标准》(GB 50496-2018)模型、CEB-FIP(1990)模型、ACI模型,对某在建项目大体积混凝土进行了温度应力监测,并基于Midas软件进行了仿真分析.结果表明,《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362-2018)模型及CEB-FIP(1990)模型的温度及应力结果与实测结果吻合最好,验证了本文计算方法的可行性.最终,将考虑收缩徐变的水化放热计算模型应用于某174.9 m×214.6 m超长筏板结构的施工过程分析中,结果表明,所采用的跳仓方式及施工措施能够保证温度及应力水平满足要求.
Abstract
Starting with the time-varying model of concrete strength,elastic modulus and shrinkage and creep model,Specifications for design of highway reinforced concrete and prestressed concrete bridges and culverts(JTG 3362-2018)model,Standard for construction of mass concrete(GB 50496-2018)model,CEB-FIP(1990)model,ACI model were compared and analyzed.Through temperature stress monitoring of a large volume concrete under construction project,simulation analysis was carried out based on Midas software.The result shows that the temperature and stress results of Specifications for design of highway reinforced concrete and prestressed concrete bridges and culverts(JTG 3362-2018)model and CEB-FIP(1990)model are in good agreement with the measured results,which verifies the accuracy of the calculation method in this paper.Finally,the calculation model of hydration heat release considering shrinkage and creep was applied to a 174.9 m×214.6 m super-long raft structure.It can be concluded that the jump mode and construction measures adopted can ensure that the temperature and stress level meet the requirements well.
关键词
水化放热/收缩/徐变/跳仓法/仿真分析Key words
hydration heat release/shrinkage/creep/alternative bay method/simulation analysis引用本文复制引用
基金项目
四川华西集团科技项目(HXKX2019/020)
出版年
2024
NETL
NSTL
万方数据