适用于型钢高强高性能混凝土柱的地震损伤模型

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。

SEISMIC DAMAGE MODEL SUITABLE FOR STEEL REINFORCED HIGH STRENGTH AND HIGH PERFORMANCE CONCRETE COLUMNS

In order to preferably analyze damage mechanism of steel reinforced high strength and high performance concrete ( SRHSHPC) columns subjected to seismic load,by comparing and analyzing the current several seismic damage models and based on hysteretic characteristics of SRHSHPC columns under low cyclic loading,it is established a seismic damage model suitable for SRHSHPC columns,which takes unloading stiffness degradation corresponding to maximum deformation and accumulated residual plastic deformation as damage parameters.Furthermore,based on existing experimental results,nonlinear regression analysis to damage model is made to determine related parameters of the model.Meanwhile,the influence of shear-span ratio,concrete strength and axialcompression ratio on the damage accumulation and development of SRHSHPC columns are analyzed.The results show that the damage of SRHSHPC columns develops faster with increasing of concrete strength and axial compression ratio during late loading stage;however,the ductility of SRHSHPC columns becomes better and the damage process becomes more smoothly with increasing of shear span ratio.