基于损伤理论的混凝土结构震害评估方法

Seismic disaster assessment approach of concrete structures based on damage theory

损伤评估方法是结构地震灾害分析的关键,也是确定结构抗震性能目标的基本依据。从混凝土结构地震灾变的微观机理入手,采用损伤本构理论描述材料性能的劣化,考虑构件及结构宏观刚度下降和承载力减小。为弥补现有评估模型的不足,作者根据当前损伤累积耗能和非线性耗能能力的比值,推导一种新的损伤评估指标模型,基于大型商业的二次开发功能实现了模型的数值计算过程。将上述理论模型用于实际混凝土结构振动台试验过程的地震损伤评估,模拟结果说明损伤评估模型和算法的合理性。

Seismic damage assessment method is the key of structural disaster analysis and the base on which the property objects are established.In this essay,the micro mechanism is investigated by damage constitutive theory to include degradation of material properties with macro stiffness and capacity decrease of components and structural system being considered.To overcome the limitations of the existing damage assessment approaches,the authors contribute a kind of novel assessment method based on damage theory which is calculated by the ratio of current accumulated damage energy and the total nonlinear energy ability.The numerical course is implemented through the re-develop function of large commercial software and made use of to simulate a concrete structure experiment executed on a shaking table.The calculation result verifies the reasonability of our model and numerical method.