拉索和水线非定常气动自激力的试验研究  

Experimental study on the unsteady aerodynamic forces on the cable and the rivulet

作　　者：李寿英[1] 孙文峰[1,2] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430050

出　　处：《土木工程学报》2014年第4期84-91,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(50708035)

摘　　要：为研究拉索和水线的非定常气动力特性,制作直径350mm的拉索模型,采用HD-2风洞实验室自主研发的强迫振动装置,进行拉索竖向和扭转耦合振动状态下的测压试验,积分得到振动状态下拉索和水线的气动升力和阻力时程,识别拉索和水线的8个相关气动导数,并利用气动导数研究拉索和水线的非定常气动力。研究结果表明,采用拉索模型扭转来模拟水线的震荡是可行的;拉索和水线的气动导数在平均升力系数突降的水线位置角下出现较大的正值,反映准定常气动力的主要特性;采用气动导数得到的拉索和水线的非定常气动力与其实际气动力吻合的较好,风雨激振理论研究可采用这种非定常方法获得拉索和水线的气动力。In order to investigate the unsteady aerodynamic forces on the cable and the rivulet during rain-wind induced vibration, a cable model with a diameter of 350mm was made and tested in the wind tunnel tests to measure the pressure distribution on the test model by a forced vibration system developed by HD-2 wind tunnel. The drag and lift forces of the cable and the rivulet were then obtained by the pressure integration. Eight aerodynamic derivatives of the cable and the rivulet were identified respectively, and the unsteady aerodynamic forces on the cable and the rivulet were carefully studied. The results show that it is feasible to simulate the rivulet oscillation on the cable surface by rotating the test model. Positive values of aerodynamic derivatives of the cable and the rivulet are found when rivulet position angle is 60~, which corresponds to a sudden decrease of the mean lift coefficient of the cable. The unsteady aerodynamic forces obtained through aerodynamic derivatives agree well with the tested forces, which indicate that the unsteady aerodynamic forces can be adopted in theoretical analysis of rain-wind induced vibration.

关 键 词：斜拉索 风雨激振 气动力 非定常 风洞试验 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] TU311.3[交通运输工程—道路与铁道工程]