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持续强震作用对结构破坏作用较强,是造成2008年汶川地震中大量房屋结构破坏的主要原因之一。为研究房屋结构在持续强震作用下的结构反应特征,设计和制作了12层RC框架结构模型,并对其开展了三次模拟地震振动台试验,研究结果表明:结构在相同地震波持续强震作用下,对这种激励波的反应强度逐渐降低,并趋于稳定;当采用其他地震波对模型结构进行激励时,结构对不同地震波的反应明显增大,结构地震反应剧烈并增长迅速。根据试验研究结果,提出结构抗震稳健性的概念,对结构抗震稳健性的机理进行了探讨,并提出了结构抗震稳健性概念性计算方法,建议加强结构的抗震稳健性研究,以提高房屋结构在持续强震作用下的安全性。
Continuous strong earthquake damage to the structure is strong, which is caused by a large number of 2008 Wenchuan earthquake damage to the structure of one of the main reasons. In order to study the structural response of building structure under the action of sustained strong earthquakes, a 12-story RC frame structure model was designed and tested three times by shaking table tests. The results show that: , The intensity of response to such excitation wave gradually decreases and tends to be stable. When other seismic waves are used to stimulate the model structure, the response of the structure to different seismic waves increases obviously, and the seismic response of the structure increases sharply and rapidly. According to the experimental results, the concept of seismic robustness of structures is proposed and the mechanism of seismic robustness of structures is discussed. A conceptual calculation method of seismic robustness of structures is proposed. It is suggested to study the seismic robustness of structures in order to improve the structural stability of structures Continued strong earthquake under the safety.