Lifespan simulation of Concrete Structure

混凝土结构寿命模拟

• 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

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

本研究的目的是寻求一种结构混凝土的寿命模拟器。为此，在每个阶段进行了实验，验证和分析建模。(1)为了预测大体积混凝土的流动特性，建立了基于能量耗散和随机颗粒碰撞剪应力的理论模型。在该模型中，混凝土由浆体、细骨料和粗骨料组成。(2)考虑混凝土孔隙的几何特征和热力学平衡，建立了一个可以预测一般干湿条件下混凝土含水量的分析模型。此外，通过模拟随机孔隙结构和孔隙水粘度，可以预测各种条件下的气体和液体渗透性。(3)本文建立了一个非线性分析系统，它考虑了水化作用、微孔隙结构发展和水分迁移之间的相互关系， ...更多信息 ，成立了。因此，可以很好地预测任何环境和初始条件下的新老混凝土的材料性能。(4)提出了一种基于细观力学物理的自干缩模型。为了预测混凝土在连续应力作用下的变形，还建立了徐变模型。通过将这些模型应用于非线性分析系统（3），可以预测各种条件下混凝土的体积变化。(5)提出了三维有限元结构分析程序和三维有限元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整体结构和材料性能，而无需区分结构和耐久性。(6)建立了混凝土中氯离子迁移和腐蚀的预测模型。此外，还研究了腐蚀劣化混凝土抗弯承载力的预测方法。少

项目成果

Y.Aoki, T.Shimomura and K.Maruyama: "A study on the prediction method for cracking of concrete member based on the analysis of drying shrinkage stress" Proc.of JCI. (appearing).

Y.Aoki、T.Shimomura 和 K.Maruyama：“基于干燥收缩应力分析的混凝土构件开裂预测方法的研究”Proc.of JCI。

T.ISHIDA, R.P.Chaube and T.KISHI: "Micro-physical approach to coupled autogenous and drying shrinkage of concrete Proceedings of the Sixth East Asia-Pacific Conference on" Structural Engineering & Construction,EASEC-6. 1905-1910 (1998)

T.ISHIDA、R.P.Chaube 和 T.KISHI：“耦合自生收缩和干燥收缩的混凝土的微观物理方法”第六届东亚太平洋结构工程会议论文集

青山 敏幸, 下村 匠, 丸山 久一: "塩害により鉄筋が腐食したRC部材の曲げ性状" コンクリート工学年次論文報告集. (投稿中).

Toshiyuki Aoyama、Takumi Shimomura、Hisakazu Maruyama：“钢筋因盐害而腐蚀的 RC 构件的弯曲性能”年度混凝土工程会议论文集（目前正在提交）。

石田 哲也, R.P.Chaube, 岸 利治, 前川 宏一: "微視的機構に基づくコンクリートの自己収縮,乾燥収縮及びその複合に関する解析的検討" 土木学会論文集. No.578/V-37. 111-121 (1997)

Tetsuya Ishida、R.P.Chaube、Toshiharu Kishi、Koichi Maekawa：“基于微观机制的混凝土自收缩、干燥收缩及其组合的分析研究”日本土木工程学会第 578/V-37 号。 121（1997）

R.P.Chaube and Koichi Maekawa: "A permeability model of concrete considering its microstructural characteristics" コンクリート工学年次論文報告集. Vol.18,No.1. 927-932 (1996)

R.P.Chaube 和 Koichi Maekawa：“考虑其微观结构特征的混凝土渗透性模型”《混凝土工程年报》第 18 卷，第 927-932 期（1996 年）。