基于虚拟简支梁法的桥梁动态称重研究

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摘要 Moses算法是桥梁动态称重（BWIM）技术中最可靠的算法之一，是目前各商业BWIM系统的基础。然而，受影响线标定的约束，当前的商用BWIM系统仅适用于短跨径桥梁。针对这一情况，提出了虚拟简支梁法。该方法利用桥梁上的某一区段的隔离应变计算车辆的轴重和总重，不受桥梁跨径的限制。建立了跨径为20m和40m的简支T梁桥有限元模型，基于车桥耦合振动理论模拟获得桥梁响应，并利用提出的新方法识别了车辆的轴重和总重。分析了路面平整度、车辆行驶速度等因素对识别精度的影响。结果表明：对于较短跨径的20m T梁桥，常见三轴车的总重识别误差平均值在2%左右，五轴车的总重识别误差平均值低于1%，精度都稍优于传统Moses算法；而对于传统Moses算法不适用的40m T梁桥，本方法识别车辆总重的误差平均值仍可控制在3%以内，表明本方法不受桥梁跨径的限制，具有更广的应用前景。

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	邓露1
	施海1
	何维1
	罗杰2

关键词 ：桥梁工程, 动态称重, 虚拟简支梁, Moses算法

Abstract：Moses algorithm is one of the most reliable algorithms in bridge weigh-in-motion (BWIM) techniques, and is the basis of commercial BWIM systems. However, restricted by calibration of influence lines, the current commercial BWIM systems are only applicable to short-span bridges. Here, aiming at this situation, the virtual simply-supported beam method was proposed. With this method, the strain of an isolated section of a bridge was used to calculate the axle load and the weight of a vehicle not restricted by bridge span. The finite element models of two simply-supported T-beam bridges with spans of 20m and 40m were built, respectively. Based on the theory of vehicle-bridge coupled vibration, the two bridges’ responses when a vehicle passes through them were obtained. Then the proposed method was used to identify the axle load and the weight of a vehicle. The influences of road surface roughness and vehicle speed, etc. on the identified accuracy were analyzed. The results showed that for the T-beam bridge with a shorter span of 20m, the average identification errors for the weight of a three-axle vehicle and a five-axle one are about 2% and less than 1%, respectively, the accuracies are slightly higher than those using the traditional Moses algorithm; for the T-beam bridge with a longer span of 40m to which the traditional Moses algorithm is not applicable, the average identification errors for vehicles’ weights can be controlled within 3% by using the proposed method; so, the proposed method is not restricted by bridge span and has wider application prospects.

Key words： bridge engineering bridge weigh-in-motion (BWIM) virtual simply-supported beam Moses

收稿日期: 2016-12-23 出版日期: 2018-07-28

引用本文:

邓露1，施海1，何维1，罗杰2. 基于虚拟简支梁法的桥梁动态称重研究[J]. 振动与冲击, 2018, 37(15): 209-215.
DENG Lu1， SHI Hai1， HE Wei1， LUO Jie2 . Vehicles’ BWIM based on virtual simply-supported beam method. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(15): 209-215.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I15/209

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