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Bridge Surface Roughness Identified from the Displacement Influence Lines of the Contact Points by Two Connected Vehicles
International Journal of Structural Stability and Dynamics ( IF 3.6 ) Pub Date : 2020-08-16 , DOI: 10.1142/s0219455420430038
Y. B. Yang, B. Q. Wang, Z. L. Wang, K. Shi, H. Xu, B. Zhang, Y. T. Wu

In this study, a new, effective procedure is proposed for identifying the surface roughness from the responses recorded of two connected test vehicles moving over the bridge. Central to this study is the proposal of a simple static correlation formula for relating the dynamic deflections of the two vehicles’s contact points on the bridge, via the displacement influence lines (DILs). With the aid of this relation, the roughness formula for estimating the bridge surface profile is derived using the responses of the leading and following vehicles. It does not require any prior knowledge of the dynamic properties of the bridge. The efficacy of the proposed procedure is validated for both the simple and three-span continuous beams by the finite element method (FEM). Also, a parametric study is conducted for various physical properties of the test vehicles. It is confirmed that the roughness profiles back-calculated from the proposed formula agree excellently with the assumed ones for both the simple and continuous beams. For use in practice, the two connected test vehicles should not be designed too heavy and not to move at too fast speeds, in order to reduce the impact on the bridge.

中文翻译:

两车接触点位移影响线识别桥梁表面粗糙度

在这项研究中,提出了一种新的有效程序,用于根据记录的两辆连接的测试车辆在桥上移动的响应来识别表面粗糙度。这项研究的核心是提出了一个简单的静态相关公式,用于通过位移影响线 (DIL) 将桥梁上两辆车的接触点的动态偏转联系起来。借助这种关系,可以利用前车和后车的响应推导出估算桥梁表面轮廓的粗糙度公式。它不需要任何关于桥梁动态特性的先验知识。通过有限元法 (FEM) 对简单和三跨连续梁验证了所提出程序的有效性。还,对测试车辆的各种物理特性进行了参数研究。已经证实,从所提出的公式反算的粗糙度轮廓与简单和连续梁的假设轮廓非常吻合。在实际使用中,两台连接的测试车不应设计得太重,也不能太快移动,以减少对桥梁的影响。
更新日期:2020-08-16
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