基于挠度监测的简支空心板梁桥安全监测与评估

doi:10.3969/j.issn.1674-0696.2023.06.04

摘要/Abstract

摘要： 选取了单一挠度监测指标，提出了挠度长期监测数据有效性系数β计算公式，确定了中小跨径简支梁桥跨中挠度采样频率f；基于铰缝损伤对简支空心板梁桥的影响，确定了铰缝损伤评估指标；设置了单梁承载能力与铰缝损伤的三级预警阈值；对某简支空心板梁桥开展了安全监测与评估。结果表明：通过简支空心板梁桥跨中挠度监测可进行单梁承载力和铰缝损伤评估；中小跨径简支梁桥挠度活载效应的最大监测值与桥梁跨径、采样频率、车辆行驶速度相关，建议跨中挠度采样频率 f ≥ 9 Hz；可用各梁板所承担的外荷载变化率来衡量铰缝损伤程度；采用三级预警机制对简支空心板梁桥进行监测预警效果良好。

关键词: 桥梁工程；空心板梁桥；安全评估；挠度监测；铰缝损伤

Abstract: A single deflection monitoring index was selected, and a formula for calculating the effectiveness coefficient β of long-term deflection monitoring data was proposed, and the deflection sampling frequency f for the short and medium span simply-supported beam bridges was determined. The assessment indexes for hinge joint damage were determined based on the effect of hinge joint damage on the simply-supported hollow slab beam bridges. Both bearing capacity of single beam and a three-level early warning threshold for hinge joint damage were set, and the safety monitoring and assessment were carried out on a simply-supported hollow slab beam bridge. The results show that the mid-span deflection monitoring of a simply-supported hollow slab beam bridge can be used to assess the bearing capacity of single beam and the hinge joint damage; the monitoring value of the mid-span deflection effect of short and medium span simply-supported beam bridges under live load is related to the bridge span, sampling frequency, and driving speed. It is recommended that the sampling frequency of mid-span deflection should be greater than or equal to 9 Hz. The change rate of external load borne by each beam slab can be used to measure the degree of hinge joint damage. The use of a three-level warning mechanism for monitoring and warning of simply-supported hollow slab beam bridges has achieved good results.

Key words: bridge engineering; hollow slab beam bridge; safety assessment; deflection monitoring; hinge joint damage

中图分类号:

U448.21

李晓娅1，2，王旭燚1，2，曹素功1，2，3. 基于挠度监测的简支空心板梁桥安全监测与评估[J]. 重庆交通大学学报（自然科学版）, 2023, 42(6): 24-31.

LI Xiaoya1,2，WANG Xuyi1,2，CAO Sugong1,2,3. Safety Monitoring and Assessment of Simply-Supported Hollow Slab Beam Bridge Based on Deflection Monitoring[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(6): 24-31.

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