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为了较好地分析型钢高强高性能混凝土柱在地震荷载作用下的损伤破坏机理,通过对现有几种地震损伤模型的分析比较,并结合低周反复荷载作用下型钢高强高性能混凝土柱的滞回特性,建立以最大变形处卸载刚度的退化和累积的残余塑性变形为破坏参数的地震损伤模型,并结合已有的试验结果对损伤模型进行了非线性回归分析,确定模型中相关参数。同时分析剪跨比、混凝土强度、轴压比对型钢高强高性能混凝土柱损伤累积和发展的影响,结果表明,在加载后期,随着混凝土强度和轴压比的增加,型钢高强高性能混凝土柱的损伤发展加快;而随着剪跨比的增加,型钢高强高性能混凝土柱的延性提高,损伤进程相对平缓。
In order to analyze the damage and failure mechanism of high-strength steel-framed reinforced concrete columns under seismic load well, by analyzing and comparing several existing earthquake damage models and combining with the low-cycle and high-strength concrete columns The characteristics of the earthquake damage model with the degenerate and cumulative residual plastic deformation of the unloading stiffness at the maximum deformation as the damage parameters are established. Based on the existing test results, nonlinear regression analysis of the damage model is conducted to determine the relevant parameters in the model. At the same time, the influence of shear span ratio, concrete strength and axial compression ratio on the damage accumulation and development of steel-made high-strength and high-performance concrete columns is analyzed. The results show that with the increase of concrete strength and axial compression ratio, With the increase of shear span ratio, the ductility of the high-strength high-performance steel reinforced concrete columns increases and the damage process is relatively gentle.