中文摘要：

直接空冷结构体系是火力发电厂随着空冷工艺出现而形成的一类特殊工业建筑，设备对结构动力特性影响显著。取1／4子结构，模拟边界条件，按1／8缩尺比制作模型。对模型进行动力特性测试，选择El-Centro波对模型进行拟动力试验，再进行拟静力试验，试验得到了动力特性参数及动力反应。分析结构自振频率与阻尼比变化、变形性能、滞回性能和破坏模式等；给出骨架曲线及其特征点。采用SAP2000有限元程序进行数值计算，分析结果与试验结果基本吻合。研究表明扭转振动是直接空冷结构体系的主要振型，应该考虑振型耦合；直接空冷结构体系为单道防线体系，大震下结构系统进入非线性后，设备系统能够保持弹性工作状态，结构易形成柱铰破坏机制。

英文摘要：

Direct air cooled condenser support platform is used with the application of air cooled technology in thermal power plants. The equipments have significant influence on the dynamic behavior of such structures. Selecting a 1/4 substructure and imitating the boundary condition, a 1/8 scale model is constructed. Dynamic properties of the model are measured, and pseudo-dynamic and pseudo-static tests are carried out to study the seismic behavior of the structure. The model is subjected to El-Centro wave. The dynamic parameters and response of the structure under earthquake are obtained in the test. The variations of natural frequency of vibration and damping ratio, the deformation performance, the hysteretic behavior and the failure mode of the model are analyzed. The skeleton curve of the model and its characteristic points are also presented. Finite element analysis is performed by using SAP2000, and the calculation results are in agreement with the results of the model test. The study shows that torsion is one of the main vibration shapes of the coupled system, thus the coupling of vibration shapes must be considered. The structure is a single-prevention system. It is also found that the equipment system is elastic when the structure system yields in column hinge mechanism under seldom-occurred earthquake.