弹性地基板模态试验及地基动参数识别.PDF

第20 卷　第2 期 中　国　公　路　学　报 Vol. 20　No. 2 2007 年3 月 China Journal of Highw ay and Transport M ar. 2007 :1001-7372(2007)0-2 000-1 06 易伟建, 周　云, 张望喜 ( , 　4 10082) :用脉冲锤击法进行了弹性地 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 础上, 对试验结果进行了初步的分析并总结了弹性 地 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 上矩形 板的有限元分析, 同时对Vlasov 地 上板的振型进行了分析, 利用刚体模态进行了Winkler 地 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 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 板的振型呈模态密集区的形式。 :道路工程;弹性地 板;模态试验;动参数识别;厚薄板通用元;刚体模态 :U416. 1　　　:A Modal Experiment on Elastic Foundation Slab and Identification of Dynamic Foundation Parameters YI We-i jian, ZHOU Yun, ZHANG Wang-xi (School of Civil Engineering, H unan University, Changsha 410082, H unan, China) Abstract:The free vibration modal experiments of elastic foundation free slab w ere conducted by hamme-r hitting excitation method, and 7 order displacement modes and strain modes w ere obtained by analyzing transfer functions used M e scope softw are. The primary analysis w as done on the experiment results and the site experience of vibration test on the elastic foundation slab w as concluded. The finite element analysis of rectangular slab on Vlasov foundation w as presented w ith thick element ADS1 w hich w as formed by high quality element LR12-2. The vibration shapes of the slab on Vlasov foundation w ere analyzed. The rigid mode w as used to identify Winkler foundation parameters;the foundation parameters of the tw o-parameter foundation w ere identified according to the principle of match of modal vibration shape by using tw o order frequencies. Results indicate that the finite element analysis program has better generalization and the vibration shapes of