Development of Analytical System for Damage and Deterioration of Concrete Structures

混凝土结构损伤和劣化分析系统的开发

基本信息

批准号：
11555117
负责人：
SHIMOMURA Takumi
金额：
$ 8.77万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The objective of this research project is to develop an analytical system that can predict performance of concrete structures subjected to various load and environmental actions. Following results were obtained.1) A computer program for numerical simulation of time-dependent performance change of RC bridges subjected to chloride attack was developed. It can predict effectiveness of some rehabilitation techniques as desalination method and retrofitting of CF sheet on service life of structures.2) Material models in the computational system mentioned above were improved, which are material transport models in cracked concrete, corrosion model of reinforcing bar in concrete and tension stiffening model for corroded RC members.3) 3D nonlinear FEM program that can simulate post peak behavior of various types of RC structures was developed.4) A testing apparatus to examine gas permeability in cracked concrete was developed. Using this apparatus, resistance of damaged concrete against ingress of aggressive agent was investigated.5) Constitutive models for concrete were improved to ensure a damage analysis of concrete structures under various conditions. A constitutive model for plane concrete under cyclic tensile and compressive stress was formulated. A constitutive model for plane concrete damaged by freeze-thaw action was formulated. A constitutive model for bonding behavior of CF sheet and concrete under static and cyclic load was formulated.

该研究项目的目的是开发一个分析系统，该系统可以预测受到各种负载和环境行动的混凝土结构的性能。获得了以下结果。1）开发了一项计算机程序，用于对经受氯化物攻击的RC桥的时间相关性能变化进行数值模拟。它可以预测某些康复技术作为淡化方法的有效性和CF表对结构的使用寿命进行改造。2）上述计算系统中的物质模型得到了改进，这是裂纹混凝土，腐蚀钢筋腐蚀模型中的物质传输模型，在混凝土中加固钢筋的腐蚀和腐蚀的RC的较高质量较高的速度较高的RC的质量质量3D的质量固定模型。开发了测试设备以检查破裂的混凝土中气体渗透性。使用该设备，研究了损坏的混凝土对侵袭性剂的耐药性。5）改进了混凝土的本构模型，以确保在各种条件下对混凝土结构进行损害分析。制定了在环状拉伸和压缩应力下的平面混凝土组成模型。制定了用于冻融作用损坏的平面混凝土的组成模型。制定了在静态和循环负载下CF板和混凝土键合行为的组成模型。