摘要
为考虑反复荷载作用下累计损伤对型钢高强高性能混凝土(SRHSHPC)框架节点力学性能的影响,进行了分析研究。该文将损伤指标引入到考虑软化段的三线型滞回模型中,建立了考虑损伤累积效应的SRHSHPC框架节点荷载-位移滞回模型,并分析了轴压比和混凝土强度对节点强度退化的影响。结果表明,理论计算与试验结果吻合较好;加载后期轴压比大的节点强度退化较快;混凝土强度高的节点加载前期强度退化较小;其受力后期抵抗位移以及荷载循环次数的能力大大下降。考虑损伤累积效应的滞回模型较为准确地模拟了SRHSHPC框架节点在反复荷载作用下的滞回性能,反映了框架节点产生损伤后其强度和刚度的退化规律,可为SRHSHPC结构的非线性地震反应分析提供理论依据。
In order to reflect the effects of accumulative damage of steel reinforced high strength and high performance concrete （SRHSHPC） frame joints on the mechanical properties such as the strength and stiffness degradation under reversed load, a damage index （D） is introduced into the hysteretic model of SRHSHPC frame joints. Then a trilinear load-displacement hysteretic model of SRHSHPC frame joints considering the accumulative damage is proposed, which could reveal the strength and stiffness degradation of SRHSHPC frame joints. At the same time, the influences of axial compression ratio and concrete strength on the strength degradation of SRHSHPC frame joints are analyzed. The calculated results tally with the experimental results well, and it is showed that the proposed hysteretic model considering the accumulative damage has a considerable precision.
出处
《水利与建筑工程学报》
2010年第2期41-44,共4页
Journal of Water Resources and Architectural Engineering
基金
陕西省教育厅专项科研计划项目(06JK263)
