灾害性地震下钢筋混凝土结构的破坏机理及抗震措施

According to the basic theory of continuum mechanics and the fracture criterion of brittle material, a 2-D discrete element model for orthotropic media based on disk elements and a 3-D discrete element model for isotropic media based on sphere elements, both of which are connected by connective type deformation components, are suggested. Overcoming the disadvantage that prevenient discrete element model with contact connexion type can not obtain enough accuracy in calculating continnum mechanics problems, these models not only can calculate the mechanics problems of continnum and discontinuum, but also can calculate the transition processes from continuum to non-continuum. Moreover, we also develop a discrete element software for mechanical analysis - SUPER-DEM. Using this software, we simulate and analyse the processes of the dynamic responses in the reinforced concrete pier of the highway under the earthquake loading observed by the oceanic observatory of Kobe，Japan, the stress wave propagation in an orthotropic plate, the damage in a concrete circular plate under impact loading, the squash of the concrete block under quasi-static loading, the penetration of a concrete plate by a bullet and the silt eliminating through blasting ect.. Through a large number of proof tests (include some experiments) and practical applications, the applicability of this software is proved. It can be a powerful tool for mechanics analysis and shows widely applicability and good prospect.

本项目通过实验获取和归纳静载与动载同时作用时钢筋混凝土的力学特性，开发有限元一离散元杂交的数值计算方法，从细观尺度上模拟灾害性地震荷载下钢筋混凝土结构的变形—损伤、破坏的演化过程和应力波传播过程。研究日本阪神地震载荷下钢筋混凝土结构的破坏机理，并研究抗震防灾措施。本项目在抗震理论和实际工程应用方面具有重要意义。