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

本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，在每个阶段都进行了实验、验证和分析建模。(1)为了预测混凝土的流动行为，建立了一个模型。理论模型是建立在能量、系统耗散和通过随机颗粒碰撞的剪应力公式的基础上的。在这个模型中，肉混凝土由浆体、细骨料和粗骨料组成。(2)我们开发了一个可以预测的分析模型。通用混凝土中的含水量干湿条件下，考虑孔隙的几何特征和热力学平衡，此外，通过模拟随机微孔结构和孔隙水的粘度，可以预测各种条件下混凝土的气体和液体渗透性。（3）非线性分析系统，该模型考虑了水化、微孔结构发育和水分传输之间的相互关系，因此可以很好地预测任意环境和初始条件下的年轻混凝土的材料性能。 (4) 我们提出了基于微观力学物理的自生收缩模型和干燥收缩模型，以预测连续应力下混凝土的变形，并通过将这些模型应用到非线性分析系统（3）中，建立了蠕变模型。可以预测各种条件下混凝土的体积变化。(5)我们提出了3D FE结构分析程序和3D FE热湿物理分析的集成计算系统(3)。该集成系统可用于同时评估。总体结构(6)建立了预测混凝土中氯离子迁移和腐蚀的分析模型，并研究了腐蚀退化混凝土抗弯能力的预测方法。