利用交通荷载下的应变响应监测简支梁桥挠度的方法

IF 3.1 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Buildings Pub Date : 2023-12-26 DOI:10.3390/buildings14010070
Yongsheng Tang, Jigang Cang, Bohan Zheng, Wei Tang
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引用次数: 0

摘要

在土木工程中,挠度测量通常被用作对桥梁安全进行结构评估的关键指标。然而,由于技术或成本问题,可能很难对桥梁挠度进行长期监测,尤其是中短跨桥梁。因此,本研究提出了一种测量简支梁桥挠度的新方法。在所提出的方法中,应变测量仅在交通荷载下的一个位置(如中跨)进行,然后重建沿梁的应变分布,利用基本的结构力学理论计算梁的挠度。为了实施该方法,首先根据位移倒易定理构建了理论,以评估交通荷载通过桥梁时,在某个位置的应变测量所得到的沿梁应变分布。其次,引入应变测量方法,即长尺寸光纤布拉格光栅 (FBG) 传感技术,对混凝土桥梁进行应变测量。第三,开发了各种有限元(FE)桥梁模型来验证所提出方法的准确性,结果表明该方法准确地实现了挠度测量,计算误差约为 5%。此外,还研究了一些关键参数的影响,如车辆类型、车速和结构损伤。模拟结果表明,中间位置铰链连接处的损坏会严重影响拟议方法的准确性,误差可能超过 10%。最后,在一座简支梁桥上进行了现场实验,进一步验证了所提方法的准确性,结果发现挠度评估误差约为 8%。考虑到 FBG 传感技术的其他优势,所提出的方法也可用于中短跨桥梁的长期挠度测量。
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Deflection Monitoring Method for Simply Supported Girder Bridges Using Strain Response under Traffic Loads
Deflection measurements are usually used as a key index in civil engineering for performing structural assessments of bridge safety. However, owing to technical or cost issues, it may be difficult to implement long-term monitoring of bridge deflection, especially for short- or medium-span bridges. Therefore, this study presents a novel method for measuring the deflection of simply supported girder bridges. In the proposed method, the strain measurement was implemented under traffic loading at only one position, such as middle span, and then the strain distribution along the girder was reconstructed to calculate the girder deflection with basic structural mechanical theory. To implement the method, the theory was constructed based on the displacement reciprocal theorem at first to assess the strain distribution along the girder from the strain measurement at some position during traffic loads passing across the bridge. Second, a strain measurement method, namely long-gauge fibre Bragg grating (FBG) sensing technology, was introduced to take strain measurements for a concrete bridge. Third, various finite element (FE) bridge models were developed to validate the proposed method’s accuracy, the results from which indicated that the method accurately implemented deflection measurement with an approximately 5% calculation error. In addition, the influence of some key parameters, such as vehicle type, vehicle speed, and structural damage, was investigated. The simulation results revealed that damage to the hinge joint in the middle location could significantly influence the proposed method’s accuracy such that the error may exceed 10%. Finally, on-site experiments were conducted on a simply supported girder bridge to further validate the proposed method’s accuracy, and an approximately 8% deflection assessment error was found. Considering the additional advantages of FBG sensing technology, the proposed method can also be effective for long-term deflection measurements of short- or medium-span bridges.
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来源期刊
Buildings
Buildings Multiple-
CiteScore
3.40
自引率
26.30%
发文量
1883
审稿时长
11 weeks
期刊介绍: BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates
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