Damage Prediction for Concrete With and Without Fibre Reinforcement

虽然混凝土结构承受大量荷载， 在设计寿命期间的应用，通常涉及应力 逆转，和混凝土是众所周知的恶化，无论是在强度 以及在这种重复载荷作用下的刚度 对它的疲劳行为知之甚少，特别是 低周疲劳范围内的损伤累积。 拟 进行全面的实验测试计划，以填补这一 知识的差距，通过测量能量耗散能力， 单向和双向荷载作用下纤维增强和非纤维增强混凝土 应力循环 这项实验研究的结果将 构成一个数据库， 混凝土构件的预测工具和低周疲劳分析 承受任意的载荷历史。 拟议研究 还包括一个分析部分，其目标是 发展一种理论来模拟混凝土中的损伤累积， 预测变幅载荷历史的疲劳寿命。 由于Palmante-Miner线性损伤累积假设是 已知既不适用于金属结构也不适用于混凝土， 获得的实验数据应作为基础， 建立更准确的损伤预测模型， 可以确定混凝土材料的剩余寿命。

Although concrete structures are subject to large numbers of load applications during the design lives, often involving stress reversals, and concrete is known to deteriorate both in strength and stiffness under such repeated load applications, relatively little is known about its fatigue behavior, especially about the damage accumulation in the low-cycle fatigue range. It is proposed to perform a comprehensive experimental test program to fill this gap in knowledge, by measuring the energy dissipation capacity of concrete with and without fibre reinforcement under uni-and biaxial stress cycles. The results of this experimental study will constitute a data base that will permit the development of damage prediction tools and low-cycle fatigue analysis of concrete members subjected to arbitrary load histories. The proposed research contains also an analytical component with the objective of developing a theory to simulate damage accumulation in concrete and to predict the fatigue life for variable-amplitude load histories. As the Palmgren-Miner hypothesis of linear damage accumulation is known to apply neither to metal structures nor to concrete, the experimental data to be obtained shall serve as a basis to construct a more accurate damage prediction model with which the remaining life of concrete material can be determined.