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结构抗震延性系数是抗震设计中一个重要的参数。试验研究工作中需要我们根据试验所得的P(荷载)—Δ(变位)曲线,准确地确定该值。对于屈服点不明显的P—Δ曲线,其关键是如何准确地确定Δ_y(屈服位移),本文针对目前常用的几种方法的缺点,提出双直线法,并从力学、数学角度提出了此双直线所应满足的条件,进行了推演。最后,为便于工程实用,在解析法的基础上导出了实用化万法。
Structural seismic ductility coefficient is an important parameter in seismic design. In the experimental research work, we need to accurately determine this value based on the P (load)-Δ (displacement) curve obtained from the test. For the P-Δ curve with unobvious yield point, the key is how to accurately determine the Δ_y (yield displacement). This paper proposes a double-straight-line method for the shortcomings of several commonly used methods, and proposes the double from the perspective of mechanics and mathematics. The conditions that the straight line should meet are deduced. Finally, in order to facilitate the practicality of the project, a practical method was derived based on the analytical method.