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提出了一种基于能力谱原理的多自由度体系延性折减系数计算方法,然后依据我国抗震规范按照不同高度、不同设防烈度设计了三组九个RC框架结构,并采用Pushover方法计算了它们的延性折减系数、超强系数和强度折减系数.发现高烈度区的结构,在相同高度下具有较低的储备强度,而在相同设防烈度下,结构越高强度储备越低.根据研究结果,指出了我国现行抗震规范下RC框架结构地震作用取值中的不足,并提出了对规范的修改建议.
A method for calculating the ductility reduction coefficient of multi-degrees-of-freedom system based on the principle of capacity spectrum is proposed. Then three RC frame structures are designed according to different seismic levels and different fortification intensities according to China’s seismic code. Pushover method is used to calculate three Ductility reduction coefficient, super-strength coefficient and strength reduction coefficient.It is found that the structure of high intensity zone has a lower reserve strength at the same altitude, while the higher the intensity reserve is, the lower the strength is.According to the research results , Points out the shortcomings in the value of the seismic action of the RC frame structure under the current anti-seismic standards in our country, and puts forward the suggestions for revising the code.