弹性地基板模态试验及地基动参数识别  

Modal Experiment on Elastic Foundation Slab and Identification of Dynamic Foundation Parameters

作　　者：易伟建[1] 周云[1] 张望喜[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中国公路学报》2007年第2期1-6,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50378034);教育部高等学校博士学科点专项科研基金项目(20030532020)

摘　　要：用脉冲锤击法进行了弹性地基上自由板的自由振动模态试验,并用Me scope软件分析传递函数,得到了7阶位移模态和应变模态。在此基础上,对试验结果进行了初步的分析并总结了弹性地基板振动测试的场地经验。对用优质LR12-2元建立的厚板ADS1元进行了Vlasov地基上矩形板的有限元分析,同时对Vlasov地基上板的振型进行了分析,利用刚体模态进行了Winkler地基参数识别,并利用2阶频率,根据模态振型匹配的原则进行双参数地基参数的识别。结果表明:该有限元分析程序具有较强的通用性,地基板的振型呈模态密集区的形式。The free vibration modal experiments of elastic foundation free slab were conducted by hammer-hitting excitation method, and 7 order displacement modes and strain modes were obtained by analyzing transfer functions used Me＇scope software. The primary analysis was done on the experiment results and the site experience of vibration test on the elastic foundation slab was concluded. The finite element analysis of rectangular slab on Vlasov foundation was presented with thick element ADS1 which was formed by high quality element LR12-2. The vibration shapes of the slab on Vlasov foundation were analyzed. The rigid mode was used to identify Winkler foundation parameters; the foundation parameters of the two-parameter foundation were identified according to the principle of match of modal vibration shape by using two order frequencies. Results indicate that the finite element analysis program has better generalization and the vibration shapes of elastic foundation slab represent modal dense region.

关 键 词：道路工程 弹性地基板 模态试验 动参数识别 厚薄板通用元 刚体模态 

分 类 号：U416.1[交通运输工程—道路与铁道工程]