作　　者： ; ; ;

机构地区： 茂名学院

出　　处： 《茂名学院学报》 2001年第3期22-25,共4页

摘　　要： 研究混凝土疲劳问题的主要困难之一 ,就是混凝土疲劳损伤的累积速度与不同强度循环荷载的作用次序有关 ,且是非线性的。但通常的一些非线性损伤模型却不能反映荷载作用次序的影响。为了解决此问题和混凝土结构在长期不稳定循环荷载作用下的疲劳问题 ,我们在Miner线性累积损伤模型的基础上提出了一个新的非线性累积损伤模型。通过两个疲劳损伤实例的计算证明了该模型不仅能够反映出不同强度应力水平先后作用次序对疲劳损伤演变情况的影响 ,而且保留了Miner模型概念明确、使用方便的优点。当通过试验得到一组有关曲线之后 ,不稳定循环荷载作用下的混凝土疲劳累积损伤计算将变得异常简单 ,极便于在工程设计中采用。 One main difficulty in researching the problem of concrete fatigue is that the damage accumulative rate of concrete fatigue, which is nonlinear, has truck with the sequence of circulating loads of the different strength. But usually some nonlinear damage models can not reflect the influence of loading sequence. To solve this problem and that of fatigue to concrete structure under the long-term action of the unstable circulating load, the paper gives out a new nonlinear accumulative damage model, on the basis of Miner Linear Accumulative Damage Model. This paper ,through two calculating examples of fatigue damage, proves that the above model can not only reflect the influence of the action order of the different stress levels on variation of fatigue damage, but also absorbs in advantages of Miner Model such as clear definition and convenience. Through the test, a set of curves will be obtained which are related to the model, and the calculation of fatigue accumulative damage to concrete under the action of the unstable circulating load will become very simplified. Furthermore, it can be applied to the engineering design conveniently.

关 键 词： 混凝土 疲劳 非线性累积损伤模型 循环荷载

领　　域： [建筑科学]