【摘要】 进行了两跨三层型钢高强混凝土框架结构的单调加载和循环加载对比试验,观测了型钢高强混凝土框架结构各阶段性能随荷载循环次数的退化现象,获取了结构的荷载-位移滞回曲线。通过对比各荷载循环所对应的滞回环,分析了结构性能退化的规律,根据试验结果提出了描述结构强度和刚度退化的退化指数模型。通过对滞回曲线、功比系数、耗能比和粘滞阻尼系数的试验值与计算值进行对比,验证了模型的适用性与准确性。结果表明,该文所提出的循环退化模型可准确描述型钢混凝土框架在反复荷载作用下的材料非线性。该研究为型钢高性能混凝土框架结构的地震反应全过程分析奠定了基础。更多还原

【Abstract】 Two steel reinforced high strength concrete (SRHSC) frames with two-bay and three-story were tested under a cyclic and monotonic load respectively. The structural performance deterioration was observed in the experiment, and the load-displacement hysteretic curve was obtained. The structural strength and stiffness deterioration were analyzed based on the tested hysteretic loops. To theoretically describe strength and stiffness deterioration, a deterioration index is proposed through fitting with experimental data. By comparing the testing results with calculating results for hysteretic curve, energy dissipation ratio as well as viscous damping coefficient, the applicability and accuracy of the proposed model was verified. The calculating results compared well with the testing results, indicating that the proposed model is capable of representing the material nonlinearity of the structure under cyclic loads. This research may be helpful for the seismic analysis of the SRHSC frame structure.更多还原