摘要
桥面不平度是影响车桥耦合振动的主要因素之一。研究了基于Fourier逆变换法在路面功率谱已知的情况下,构造路面不平度随机序列的算法,通过与三角级数叠加法对比,结果表明,Fourier逆变换法模拟的路面不平度功率谱与预期谱能更好的吻合。同时,根据实测的上饶乔木湾乐安河大桥桥面不平度数据,计算该桥面不平度功率谱密度并与国家标准GB/T7031-86进行对比,结果显示该桥桥面处于B级到C级之间,这为精确计算车桥耦合振动提供了有利的理论依据。
There are many factors which affect the response of bridge due to moving vehicle, one of them, rough deck is a leading factor. Based on the method of Fourier reverse transform, the algorithm how to build up the random sequence of road roughness depending on the destine PSD was studied. Through compared with trigonometric series superposition method, the method of reverse Fourier is better consistent with the destine PSD. Many data of the bridge roughness were measured in Le An river. Through compared the power density of actual measure data with China standard GB/TT031-86, the results indicate that the Le An river deck located between B and C. At the same time, the result affords theory warrant to analyze accurately the vibration of bridges under moving vehicles.
出处
《公路工程》
2007年第6期39-43,共5页
Highway Engineering
基金
江西省自然科学基金资助项目(550012)
关键词
功率谱密度
桥面不平度
傅里叶逆变换
测试分析
power spectral density
rough deck
Fourier inverse transform
analyse of testing
