利用涡激共振竖向位移响应,基于广义谐波函数KBM法并引入缓变参数的概念,对Scanlan经验非线性模型进行处理,识别其中的气动参数,并得到Seanlan非线性涡激力.对识别得到的Scanlan非线性涡激力,分别通过:用Newmarkβ反求响应与实测响应进行比较;与从大平同步测得的合力中提取出实测的涡激力进行比较,对识别精度做出评价.试验是在同济大学TJ-1号风洞均匀流场中进行的,以象山港大桥初始设计阶段节段模型为例,用激光位移计采集模型的位移响应,并用一维梁式应变测力天平同步采集模型所受的力.%Aerodynamic parameters of Scanlan' s nonlinear empirical model were identified by using the data of vertical vortex response. Based on the generalized harmonic wave functionH KBM method and under the presupposition of slowly varying parameters, the function of Scanlan' s nonlinear empirical model was solved. And then the aerodynamic parameters of the model and the Scanlan' s nonlinear vortex-induced force were identified. The identification precision was evaluated via the following two methods: the response calculated according to the Newmark β method was compared with the field measured response; and the self-excited VIV force extracted from the total force collected by the one-dimensional balances was compared with the field measured exciting force. The experiment was carried out in TJ-1 wind tunnel of Tongji University using the preliminarily designed section model of Xiangshangang bridge. The vertical response of the section model was collected by the laser displacement sensor, and meanwhile the total force was collected by beam-type strain force balances of one-dimension.
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