大体积混凝土结合层面初始温度赋值研究  

Study on assignment of initial temperature at the interface of mass concrete

作　　者：杨剑[1,2] 胡昱[1] 金峰[1] 潘定才[3] 左正[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]中国华能集团清洁能源技术研究院有限公司,北京100098 [3]中国南方电网调峰调频发电公司深圳抽水蓄能电站建设管理局,广东深圳518115

出　　处：《水力发电学报》2013年第3期176-180,共5页Journal of Hydroelectric Engineering

基　　金：国家"十一五"规划科技支撑项目(2008BAB29B05);国家973计划(2007CB714108);清华大学水沙科学与水利水电工程国家重点实验室科研课题(2012-KY-4)

摘　　要：本文研究了大体积混凝土浇筑时结合层面初始温度的赋值问题。遵循能量守恒原理,在有限元方法中,能量修正算法将老混凝土的当前计算温度作为浇筑层面结点温度,则可推导由此导致的系统虚假能量增量的一般表达式。该虚假能量增量以额外的"负热源"形式作为边界条件施加在相应的新混凝土单元上。能量修正算法不受单元大小、形态限制,不必修改结点温度,应用简便。数值算例验证了该方法的合理性和准确性。In this paper an energy correction algorithm is developed for assignment of initial temperature value at the interface of mass concrete. The technique of element removal or reactivation is commonly used in finite element method to model the construction of mass concrete. If manual correction of nodal temperature is not expected, a virtual energy increment will be generated due to the temperature difference at the fresh-to-old concrete interface. A general formulation is derived for computation of this virtual energy increment and applied it to the fresh concrete elements by introducing an additional heat flux at the activation step. This algorithm is independent of the size and shape of finite elements, its rationality and accuracy are verified through a numerical example.

关 键 词：水工结构 初始温度 能量修正算法 大体积混凝土 结合层面 

分 类 号：TV31[水利工程—水工结构工程]