典型流线桥梁断面缩阶微分方程抖振气动力模型

发布时间：2018-06-10 05:18

本文选题：桥梁工程 + 桥梁断面　；参考：《振动工程学报》2017年03期

【摘要】：目前的桥梁断面气动力理论框架中,气动力通常采用Scanlan线性准定常公式和Davenport气动导纳概念对准定常抖振力进行修正。已有的研究表明,导纳函数随来流特性变化较为明显,对同一桥梁断面也没有统一适用的导纳函数表达。除此之外,抖振力非线性特性方面的理论研究亦为国际风工程前沿热点问题。结合上述两方面,以桥梁抖振分析的关键问题抖振气动力合理建模为出发点,建立了基于状态空间方程的非定常、非线性时域抖振力模型。提出了能同时准确模拟非定常、非线性效应的纯时域气动力模型——缩阶微分方程抖振气动力模型。利用主动控制风洞试验技术进行桥梁节段模型抖振力荷载测量试验,对比研究了窄带和宽带谐波来流条件下的桥梁断面气动力荷载的非定常、非线性特性。
[Abstract]:Scanlan's linear quasi-steady formula and Davenport's aerodynamic admittance concept are usually used to modify the steady buffeting force in the current aerodynamic theory of bridge cross-section. It has been shown that the admittance function varies obviously with the incoming flow characteristics, and there is no uniform admittance function expression for the same bridge section. In addition, the theoretical research on the nonlinear characteristics of buffeting force is also a hot topic in international wind engineering. Based on the above two aspects, the unsteady and nonlinear time-domain buffeting force model based on state space equation is established based on the reasonable modeling of buffeting aerodynamic force, which is the key problem of bridge buffeting analysis. A pure time-domain aerodynamic model, namely buffeting aerodynamic model of reduced order differential equation, which can accurately simulate unsteady and nonlinear effects at the same time, is proposed. The active control wind tunnel test technique is used to measure the buffeting load of bridge segment model. The unsteady and nonlinear characteristics of aerodynamic load of bridge section under narrow band and wide band harmonic flow are comparatively studied.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：科技部国家重点基础研究计划(973计划)(2013CB036300) 国家自然科学基金资助项目(51323013,51678451) 新世纪优秀人才支持计划资助项目(NCET-13-0429)
【分类号】：U441.3

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