动载作用下机场刚性道面模态参数识别研究

Research on Airport Rigid Pavement Modal Parameter Identification Based on Dynamic Loading

关于机场道面刚性结构参数识别问题,研究移动荷载作用下机场刚性道面识别系统中,传统弹性、粘弹性解析识别精度的不足,建立了移动荷载作用下弹性支承边界、弹性嵌固边界和实际边界条件下的道面板的运动方程,提出了一种基于变分法、功互等定理的Kelvin粘弹性地基上道面板系统的识别方法。同时根据最小二乘法准则进行反演,拟合实测动挠度和理论动挠度,从而识别出地基反应模量K。经仿真与实测结果可知,改进方法在保证识别速度的前提下可以显著提高识别精度,具有很好的应用价值,为机场刚性道面的设计、参数识别和质量评价等提供理论依据。

Research the airport rigid pavement finite size rectangular plate system under dynamic loading. In the light of the insufficient identification precision of the traditional elastic, viscoelastic analytical method, the paper es- tablished a pavement motion equation of elastic support boundary, elastic fixed boundary and the actual boundary con- ditions under the dynamic loading action, and proposed a Kelvin viscoelastic foundation pavement system identifica- tion method based on the variational method and the Betti＇ s reciprocal theorem. According to the least squares criteri-on for inversion at the same time, it fitted the measured dynamic deflection and the theoretical dynamic deflection, and consequently identify the foundation reaction modulus K. The simulation and actual measurement results show that the methods can significantly improve the identification accuracy in the premise of ensuring the recognition rate, and it has the good application value to provide theoretical basis for the airport rigid pavement design, parameter iden-tification and evaluation of quality.