Lifespan simulation of Concrete Structure

混凝土结构寿命模拟

基本信息

批准号：
08405033
负责人：
OKAMURA Hajime
金额：
$ 22.85万
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 (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08405033/
关键词：
Concrete Structure Lifespan Self-compacting Concrete Micro-pore Structure autogenous drying shrinkage creep mass transport

项目摘要

The objective of this research is to seek for a so called life-span simulator of structural concrete. For this purpose, experiment, verification and analytical modeling were carried out at each stage.(1) To predict the flow behavior of flesh concrete, a theoretical model was established on a basis of energy, dissipated out of the system and shear stress formulation through random particle collisions. In this model, flesh concrete consists of paste, fine and coarse aggregate.(2) We developed an analytical model which can predict the water content in concrete under generic drying-wetting conditions, considering the geometric characteristics of pores and thermodynamic equilibrium. Furthermore, by modeling random micropore structures and viscosity of pore water, the gas and liquid permeability of concrete can be predicted under various conditions.(3) A nonlinear analytical system, which considers the inter-relationship between hydration, micro-pore structure development and moisture transp … More ort, was established. As a result, the material properties of young aged concrete can be well predicted for arbitrary environmental and initial conditions.(4) We proposed an autogenous and drying shrinkage model based on micro mechanical physics. For predicting the deformation of concrete under continuous stress, a creep model was also established. By implementing these model to the nonlinear analytical system (3), the volumetric change of concrete can be predicted for various conditions.(5) We presented an integrated computational system of 3D FE structural analysis program, and 3D FE thermo-hygro physical analysis (3). This proposed integrated system can be used for simultaneous evaluation of the total structural and material performances without distinguishing between structural and durability.(6) An analytical model to predict the chloride ion transport and corrosion in concrete was developed. Furthermore, the prediction method of bending capacity of deteriorated concrete due to corrosion was also studied. Less

这项研究的目的是寻找一种所谓的结构混凝土寿命模拟器。为此，在每个阶段进行了实验，验证和分析模型。（1）为了预测肉类混凝土的流动行为，基于能量的基础建立了一个理论模型，从系统中消散并通过随机的粒子碰撞来建立剪切应力公式。在此模型中，肉混凝土由糊状，细和粗骨料组成。（2）我们开发了一个分析模型，该模型可以在孔隙干燥润湿条件下预测混凝土中的水含量，考虑到毛孔的几何特征和热力学平衡。此外，通过对随机微孔结构和孔隙水的粘度进行建模，可以在各种条件下预测混凝土的气体和液体渗透性。（3）建立了一种非线性分析系统，该系统考虑了水合，微孔结构的发展和水分的交换之间的相互关系，建立了更多的transp…更多。结果，对于任意环境和初始条件，可以很好地预测年轻老化混凝土的材料特性。（4）我们提出了基于微型机械物理学的自源和干燥收缩模型。为了预测连续应力下混凝土的变形，还建立了蠕变模型。通过将这些模型实施到非线性分析系统（3），可以预测混凝土的体积变化。（5）我们提出了3D FE结构分析程序的集成计算系统，以及3D FE Thero-Hygro物理分析（3）。该提出的集成系统可用于同时评估总结构和材料性能，而无需区分结构和耐用性。（6）一种分析模型，以预测混凝土中氯离子的运输和腐蚀。此外，还研究了由于腐蚀引起的混凝土弯曲能力的预测方法。较少的