型钢高强高性能混凝土框架柱地震损伤分析

为了研究地震作用下型钢高强高性能混凝土构件的损伤,总结和分析了已有地震损伤模型存在的不足,基于低周反复荷载作用下型钢高强高性能混凝土框架柱的损伤试验研究结果,对框架柱的地震损伤特性进行了分析。通过合理地考虑循环次数对构件极限抵御能力(极限耗能和变形能力)的影响以及加载路径对损伤的影响,建立了能够全面反映水平地震作用下构件力学特性变化的基于变形和能量组合的非线性双参数损伤模型。对损伤模型中相应的参数进行了讨论和分析,并给出了其具体定义和表达式。结合试验结果,对损伤模型的有效性进行了验证。研究结果表明,该模型能够较好地描述型钢高强高性能混凝土框架柱的地震损伤演化过程与程度,且理论上更为合理。研究结果为该类结构构件的地震损伤评估以及基于损伤的抗震设计方法的建立提供了理论依据。

SEISMIC DAMAGE ANALYSIS FOR SRHSHPC FRAME COLUMNS

To research the damage of steel reinforcement high strength high performance concrete(SRHSHPC) members under earthquake,the deficiency of existing seismic damage models was pointed out and discussed.Based on test results of SRHSHPC frame columns under low cycle reversed loading,the seismic damage characteristics of SRHSHPC frame columns is analyzed.The damage model was established by reasonably considering the effect of cycle number on ultimate resistance capacity(ultimate deformation and ultimate energy dissipation capacity) of members and the effect of loading history.According to the test results,the related parameters were defined and calibrated in the damage model proposed inhere.Finally,the validity of the damage model was verified thorough a comparison with the test results.The result shows that the damage model can well describe the seismic damage evolvement process and the damage degree of SRHSHPC frame columns,and is more reasonable in theory.