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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。
The monotonic loading and cyclic loading comparison tests of the two-span three-story steel reinforced high-strength concrete frame structure were carried out. The degradation of load-displacement cycles was observed and the load-displacement hysteresis curves of the structure were obtained. By comparing the hysteresis loop corresponding to each load cycle, the law of structural performance degradation was analyzed. According to the test results, a degradation index model describing the degradation of structural strength and stiffness was proposed. By comparing the experimental values and calculated values of hysteresis curve, power ratio coefficient, energy dissipation ratio and viscous damping coefficient, the applicability and accuracy of the model are verified. The results show that the cyclic degradation model proposed in this paper can accurately describe the material nonlinearity of SRC frames under repeated load. The research lays the foundation for the whole process of seismic response analysis of high-performance steel frame structure.