Unification of thermo-physics of materials and mechanics of concrete structures

材料热物理与混凝土结构力学的统一

基本信息

批准号：
09450173
负责人：
MAEKAWA Koichi
金额：
$ 8.83万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

In this research, the unification of mechanics and thermo-dynamics of materials and structures is tackled for simultaneous evaluation of the total structural and material performances over the life span of concrete structures. The results of this research can be summarized as follows.(1) An integrated computational system of 3D FE, structural analysis program, and 3D FE thermo-hygro physical analysis was proposed. This coupling method under multi-task operation enables engineers easily to iink independently developed computer codes even if being written different languages and algorithms, since each system is managed by operating system and the calculated results can be shared through the common data area.(2) in the above system, the volume change of cementitious materials due to moisture, hydration, and heat transfer should be evaluated. In this study, we proposed an autogenous and drying shrinkage model based on micro mechanical physics. The shrinkage behavior is modeled from the capillary tension force and the development of micro-pore structure. This framework can be a predictive method of the volume change of concrete due to the autogenous, drying shrinkage and their combination for arbitrary conditions.(3) A solidification model based on microphysical information for the prediction of both creep and shrinkage of hardening young concrete is proposed. Aggregates are idealized as suspended continuum media of perfect elasticity, whereas cement paste is treated as the solidified clusters having each mechanical property. The combination of both phases is used to represent the overall composite under unstable transient situations at early age. In this framework, basic creep, drying creep, and unrestrained shrinkage behavior can be evaluated in a unified manner without distinguishing each phenomena.

在这项研究中，对材料和结构的力学和热力学的统一进行了处理，以同时评估混凝土结构寿命中的总结构和材料性能。（1）提出了3D FE，结构分析程序和3D FE Thermo-Hygro物理分析的集成计算系统的综合计算系统。多任务操作下的这种耦合方法即使编写了不同的语言和算法，因此工程师可以轻松地独立开发的计算机代码，因为每个系统都由操作系统管理，并且可以通过公共数据区域共享计算的结果。（2）在上述系统中，由于水分，水分和热传输的胶结材料的变化，因此可以评估胶合物的体积变化。在这项研究中，我们提出了一种基于微型机械物理学的自体和干燥收缩模型。收缩行为是根据毛细管张力和微孔结构的发展进行建模的。由于自动源，干燥收缩及其在任意条件下的组合，该框架可以是混凝土体积变化的一种预测方法。（3）提出了基于微物理信息的固化模型，以预测蠕变和硬化幼年混凝土的收缩。理想化的聚集体是具有完美弹性的悬浮连续培养基，而水泥酱被视为具有每个机械性能的固化簇。这两个阶段的组合用于在早期不稳定的瞬态情况下代表整体复合材料。在此框架中，可以以统一的方式评估基本的蠕变，干燥蠕变和不受约束的收缩行为，而无需区分每个现象。