【摘要】 由于传统的双线性方法无法准确拟合软化的静力推覆曲线,基于等能量原则,提出一种软化静力推覆曲线的三线性分段拟合方法,并给出等效过程的具体步骤.以2个钢筋混凝土框架结构为算例,对软化的静力推覆曲线分别进行双线性和三线性等效,并与原结构非线性动力时程分析的结果进行比较.结果表明,对于软化的静力推覆曲线,三线性等效方法比双线性等效方法更接近非线性动力时程分析的结果.更多还原

【Abstract】 Because the traditional bilinear fitting method is difficult to fit softening static pushover curves,we propose the trilinear piecewise linear fitting method to fit such curves based on equal energy rules. The processes are provided step by step. Taking two reinforced concrete frame structures as examples,we fit softening static pushover curves of the cases with both bilinear and trilinear fitting methods,and compare the results of the two methods with the results computed by nonlinear dynamic time history method respectively. Research indicates that the proposed trilinear fitting method is more accurate than the traditional bilinear method for structures whose pushover curves have descending branch.更多还原