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为了研究钢骨超高强混凝土(SRUHSC)柱-混凝土(RC)梁框架节点的地震损伤,在12个框架节点低周反复加载试验基础上,分析损伤发展规律。根据能量等效原理,以框架节点在外力所作功为初始总能量,建立了框架节点地震损伤定量计算方法,并对地震损伤指数增长规律进行了分析。分析了配箍率、轴压比、钢骨形式3种试验参数对地震损伤指数的影响。进而提出了SRUHSC柱-RC梁框架节点的地震损伤评定模型。结果表明:基于能量法建立的地震损伤指数和评定模型,能较好地反映在低周反复荷载作用下SRUHSC柱-RC梁框架节点的损伤状态,该结果可为此类结构的抗震加固修复提供理论参考。
In order to study the seismic damage of SRUHSC column-to-column joints, the developmental rules of damage were analyzed based on the low-cycle repeated loading tests of 12 frame nodes. According to the principle of energy equivalence, the method of quantitative calculation of seismic damage of frame joints is established based on the total work done by frame joints in external force. The law of the growth of earthquake damage index is also analyzed. The influence of the three kinds of test parameters including stirrup ratio, axial compression ratio and steel form on earthquake damage index was analyzed. Then the seismic damage assessment model of SRUHSC column-RC beam frame joints is proposed. The results show that the seismic damage index and evaluation model based on the energy method can well reflect the damage state of the SRUHSC column-RC beam frame joints under low cyclic loading, and the results can provide the seismic strengthening and repair of such structures Theoretical reference.