基于动挠度实现桥梁限载监测的研究

The passing vehicle total mass or axle load quality overloading is the important factor of highway bridges damage, at the same time, the dynamic response of bridges is the main basis for the evaluation of bridge damage, therefore, bridge load limit monitoring and dynamic response monitoring are main contents of the bridge operation safety monitoring, but their realization methods are independent of each other, which cause the bridge operation safety monitoring system structure too complex. This project aims to put the realization method of the two aspects of research combining, in simply supported T beam bridge based on the main dynamic response of bridge—measured dynamic deflection to identify the total quality or axle load quality of vehicles whether mass: first study how to realize the slow changed dynamic deflection accurate monitoring using inclinometer and wavelet analysis, and then focus on study how to base on slow changed dynamic deflection and other information to identify the total quality or the quality of axial load of vehicle whether mass under complex condition. The project is expected to establish a new method to realize dynamic deflection monitoring of beam at the same time also realize the bridge load limit monitoring based on inclinometer. Results of this project can simplify the operation safety monitoring system structure of some bridges (containing at least 1 span simply supported T type bridge) and reduce the cost of such bridge operation safety monitoring, can also be an important reference for other type bridge which based on the dynamic deflection to realize the limit load monitoring, can also promote the development of the bridge operation safety monitoring technology.

通行车辆总质量或轴载质量超限是引起桥梁损伤的主要因素;同时桥梁动力响应是评估桥梁损伤的主要依据,因此,桥梁限载监测和桥梁动力响应监测都是桥梁运营安全监测的重要内容,但是它们的实现方法相互独立,使桥梁运营安全监测系统结构过于复杂。本项目拟把这两方面的实现方法结合起来开展研究,在简支T型梁桥上基于梁体的主要动力响应—实测动挠度识别通行车辆总质量或轴载质量是否超限:首先利用倾角仪和小波分析实现梁体动挠度的精确监测,然后重点研究如何基于实测梁体动挠度等信息识别出复杂工况下通行车辆总质量或轴载质量是否超限。项目预期将建立一种基于倾角仪实现梁体动挠度监测的同时也实现桥梁限载监测的新方法。项目的研究成果可简化一些桥梁（至少含1跨简支T型桥型）的运营安全监测系统结构和降低其监测成本,也可为基于动挠度实现其它桥型的限载监测提供参考,可促进我国桥梁运营安全监测技术的发展。

通行车辆总质量或轴载质量超限是引起桥梁损伤的主要因素；同时桥梁动力响应是评估桥梁损伤的主要依据，因此，桥梁限载监测和桥梁动力响应监测都是桥梁运营安全监测的重要内容。现有监测方法需要两套相互独立的子系统来才能实现这两项内容的监测。本项目研制了一套可同时监测这两项内容的系统----基于桥梁动挠度监测系统实现桥梁限载的监测。其实现方法是首先利用倾角仪和小波分析设计了一套桥梁动挠度监测系统，实现梁体动挠度的精确监测；然后建立了一种由实测动挠度与桥梁挠度设计允许值的比值系数法来确定通行卡车是否超限，最终通过桥面摄像头记录超限卡车的车牌。本项目的研究成果简化了简支桥梁的运营安全监测系统，也可降低其运营安全监测费用。