一种简化的混凝土结构地震损伤评估模型及方法

A Simplified Seismic Damage Assessment Model and Method for RC Structure

随着地震工程学的发展和结构抗震设计思想和理论的进步,探讨结构在地震作用下的地震损伤破坏机理和基于结构性能的抗震设计方法(PBSD)逐渐得到了各国专家、学者的重视。而地震损伤评估的研究就是其中的一个重要方向。鉴于现阶段混凝土结构地震损伤评估方法的局限性,本文采用推广的混凝土材料的Mazars损伤模型,进而提出了一种基于常规有限元分析荷载子步的简化的地震损伤评估方法,这种方法实现简单,便于实际工程应用,同时具有一定的精细性。最后,将本文的损伤评估方法应用到一个钢筋混凝土框架的地震损伤评估实例中,分析结果与实验和实际的震害比较吻合,表明本文提出的模型和方法是有效的。

With the development of earthquake engineering and the progress of theory on anti-seismic design, the failure mechanism of structures and the complete process analysis under earthquakes become increasingly important. The performance based seismic design method （PBSD） is also paid attention to by many experts. Currently, the structural seismic evaluation is one of the important research directions in PBSD. In view of the limitation of reinforced concrete structural seismic assessment with recent methods, a simplified seismic assessment method is proposed which is based on the ordinary FEA substep and uniaxial Mazars damage model for concrete. This method has some good traits including definite physical meaning, easy implementation and convenient application. In addition, it has a relatively satisfying precision. Finally, our method was applied to a seismic assessment of a reinforced concrete frame, and the results are in good agreement with the observation in experiments.