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对落石的冲击速度进行估算,分析了落石冲击混凝土柱过程中冲击力大小和作用时间长短的影响因素,并提出了冲击力和作用时间的估算公式。采用LS-DYNA软件对某多层RC框架进行了落石冲击抗连续倒塌分析,分析采用动力冲击弹塑性时程法,混凝土和钢筋材料本构模型采用欧洲规范EC2,分析中考虑楼板的拉结作用。分析结果表明,可将被撞击破坏柱顶节点竖向变形是否小于限值以及是否达到稳定作为抗连续倒塌整体的判定准则,可将关键拉结构件变形是否小于限值以及内力是否达到稳定作为构件的判定准则。
The impact velocity of rockfall was estimated. The influencing factors of impact force and duration of rockfall impacting concrete column were analyzed, and the formulas of impact force and action time were proposed. A multi-layer RC frame was analyzed by LS-DYNA software. The impact-resistance and plastic-plastic time-history method was used in the analysis. The EC2 model was adopted for the constitutive model of concrete and steel, and the effect of floor pull- . The analysis results show that whether the deformation of the critical pull structure is less than the limit and whether the internal force is stable can be regarded as the component whether the vertical deformation of the column roof subjected to impact damage is less than the limit value and whether the stability is achieved as a criterion of anti-continuous collapse. Judgment criteria.