粘弹性地基上多块板的动力时域反分析方法
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摘要
本文针对具有接缝传荷的多块板动力反问题，提出一种在时域内解决的方法。首先 应用有限元方法对多块板进行离散，并将地基简化为由弹簧和阻尼器组成的粘弹性地基，成 功地分析了粘弹性地基上多块板的动力问题［５］．进而根据系统识别方法，对落锤式弯沉仪（ＦＷＤ） 传感器所记录的时程曲线进行反演分析来确定结构参数。数值计算结果表明，该方法具有较 好的稳定性和收敛性。可以广泛应用于以落锤式弯沉仪（ＦＷＤ）为检测工具的混凝土路面上， 从而为进一步研究刚性路面的无损检测和承载力评价提供了技术基础。
A finite element approach to the dynamic analysis of multi-slabs with discontinuities is presented. At the discontinuities, the slab interaction at the transverse joints is idealized by effective shear transfer. The viscoelastic foundation is modeled by distributed spring and linear spring and dashpot systems. The uniform dynamic force is recorded by the falling weight deflectometer (FWD), which has vertical components of velocity and acceleration. With the system identification method, an inverse algorithm in time domain is developed to determine the property parameters of multi-slabs. Numerical results show that system identification method is an efficient approach that converges quickly for a wide range of initial values of module. Therefore, it provides the basis of evaluating load-carrying capacity and conducting nondestructive measurement.
A finite element approach to the dynamic analysis of multi-slabs with discontinuities is presented. At the discontinuities, the slab interaction at the transverse joints is idealized by effective shear transfer. The viscoelastic foundation is modeled by distributed spring and linear spring and dashpot systems. The uniform dynamic force is recorded by the falling weight deflectometer (FWD), which has vertical components of velocity and acceleration. With the system identification method, an inverse algorithm in time domain is developed to determine the property parameters of multi-slabs. Numerical results show that system identification method is an efficient approach that converges quickly for a wide range of initial values of module. Therefore, it provides the basis of evaluating load-carrying capacity and conducting nondestructive measurement.
引文
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[2]姚炳卿.考虑接缝传荷能力的机场刚性道面板的有限元分析方法[J].土木工程学报,1993,26(3):22-30l.
[3]王复明,姬亦工,乐金朝.多层弹性地基板材料性能的反演分析[J].固体力学学报,1999,20(1):76-80.
[4]王云剑.振动反问题在工程中的应用[J].地震工程与工程振动,1995,15(3):59-68.
[5]张小庆,姬亦工,王复明,乐金朝.粘弹性地基多块板动力分析[C].工程力学增刊,1999.895-899.
[6] Wang Fuming, Lytton R L.System Identification Method for Backcalculating Pavement Layerproperties[A]. Transportation Research Record,1384. D C Washington. Transportation Research Board,1993. 1-7.
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