Lifespan simulation of Concrete Structure

本研究的目的是寻求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)为了预测骨料混凝土的流动行为，建立了基于能量耗散和随机颗粒碰撞剪应力公式的理论模型。在该模型中，骨料混凝土由浆体、细骨料和粗骨料组成。(2)考虑孔隙的几何特征和热力学平衡，建立了能够预测一般干湿条件下混凝土含水率的分析模型。此外，通过模拟随机微孔结构和孔隙水的粘度，可以预测不同条件下混凝土的气体和液体渗透性。(3)考虑水化、微孔结构发展和水分传输…之间的相互关系的非线性分析系统更多的港口，是建立的。因此，在任意的环境和初始条件下，可以很好地预测早龄期混凝土的材料性能。(4)提出了基于细观力学物理的自生干燥收缩模型。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到非线性分析系统中(3)，可以预测混凝土在不同条件下的体积变化。(5)提出了一个完整的三维有限元结构分析程序和三维有限元热湿物理分析的计算系统。该综合评价系统可以同时评价混凝土的整体结构性能和材料性能，而不需要区分结构和耐久性。(6)建立了氯离子在混凝土中迁移和腐蚀的分析模型。此外，还对锈蚀劣化混凝土的抗弯承载力预测方法进行了研究。较少

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