• (1)2008-2021年连续14年获得中国科技核心期刊
  • (2)2021年被中国科学院文献情报中心中国科学引文数据库CSCD(核心库)收录(2021-2022)
  • (3)热烈庆祝《水资源与水工程学报》入编北京大学图书馆《中文核心期刊要目总览》2020年版
彭文明.生长单元在碾压混凝土结构仿真计算中的应用技巧水资源与水工程学报[J].,2022,33(4):164-170
生长单元在碾压混凝土结构仿真计算中的应用技巧
Application techniques of growing elements in the simulation calculation of RCC construction
  
DOI:10.11705/j.issn.1672-643X.2022.04.22
中文关键词:  碾压混凝土  仿真计算  生长单元  形函数  有限元
英文关键词:roller compacted concrete(RCC)  simulation calculation  growing element  shape function  finite element method
基金项目:
作者单位
彭文明 (中国电建集团成都勘测设计研究院有限公司 勘测设计分公司 四川 成都 610072) 
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中文摘要:
      在碾压混凝土薄层碾压施工仿真分析中,为提高计算效率,通常采用包含多层材料的层合单元,其中生长单元是浇筑仓面逐渐生成层合单元的过渡形态。由于早期混凝土温度和弹性模量对龄期非常敏感,各碾压层混凝土的性能差异较大,因而采用常规双线性形函数描述生长单元会在有限元计算中产生误差。基于此,提出了生长单元的分段形函数方法,以解决因早期各层混凝土性能差异大而导致的计算精度不高的问题。此外,随着浇筑仓面的变化,生长单元的形状和参数应进行动态调整,本文提出了生长处理技术,包括散热边界的搜索与替换、新增层节点的初始值重置、新老混凝土的单元连接等。通过算例分析,验证了本文分段形函数方法对生长单元的计算精度有较大改善,生长处理技术提高了生长单元的应用范围,可供相关研究参考。
英文摘要:
      In the simulation analysis of roller compacted concrete(RCC) thin-layer rolling construction, laminated elements containing multi-layer materials are commonly used in order to improve the calculation efficiency, among which the growing element is the transition form of gradually forming laminated elements on the pouring warehouse surface. Because the temperature and elastic modulus of early concrete are very sensitive to age, and the performance of concrete in each roller compacted layer varies greatly, the conventional bilinear function method is prone to errors when describing the growing element in the finite element calculation. In view of this, the piecewise shape function method of growing element is proposed to solve the problem of low calculation accuracy caused by the large property difference of different layers of early concrete. In addition, in respond to the change of pouring warehouse surface, the shape and parameters of the growing element should be dynamically adjusted. The proposed growth processing techniques include the search and replacement of heat dissipation boundary, the initial value reset of new layer nodes, the unit connection of new and old concrete and so on. According to the example analysis, it is verified that the piecewise shape function method can greatly improve the calculation accuracy of the growing element, and the growth processing techniques can improve the application range of the growing element, which can be used as a reference for relevant research.
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