基于频率法和非线性静力求解法对短吊索抗弯刚度的识别

摘要

Suspension cable bending stiffness is related to a variety of factors.As an unknown parame-ter,the suspension cable bending stiffness is difficult to be identified accurately in actual engineering. In this paper a 3m long sling being made up of 5mm diameter high-strength galvanized steel wires is selected as the research subject.The frequency method and nonlinear static solution are used to esti-mate short sling bending stiffness.Amended bending stiffness is taken to stress analysis of the sling. The results show that the spherical rotation means of the short sling can be canceled,which will re-duce the project cost,and is beneficial to routine maintenance.%吊索弯曲刚度与多种因素有关，是一个未知的参数，在工程实践中往往难以准确识别。文中选取了某悬索桥3 m 长由直径为5 mm 高强镀锌钢丝组成的吊索作为研究对象，采用频率法和非线性静力求解法分别推求短吊索的抗弯刚度，按修正后的抗弯刚度对吊索进行受力分析。结果表明，该悬索桥短吊索的球形转动装置可以取消，不仅可以降低工程成本，还便于日常养护。