Time-Dependent Reliability Analysis for Deflection of a Reinforced Concrete Box Girder Bridge

Abrham Gebre Tarekegn
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Abstract

Prior to casting of concrete, proper supervision and attention to camber provision in bridge construction are required. It is also critical to use an appropriate quality control manual, pay due attention to reinforcement bar placement, and have a high level of formwork design before construction begins. If these issues are not properly addressed, performance of structures will be affected. In this research, performance of a 40.5m box-girder reinforced concrete bridge which was constructed without having proper camber is studied. As camber was the most important issue of the bridge under investigation, the impact on strength and serviceability requirements is compared to the standard. A dynamic load test with an Arduino type accelerometer is performed to assess the bridge's current condition in relation to the serviceability limit requirement. The deterioration of reinforced concrete (RC) sections due to reinforcement corrosion, creep, and an increase in load intensity, as well as the corresponding statistical distributions are considered to estimate the long-term effect of bridge deflection. The time-variant analysis results show that a linear decrease in deflection reliability indices with the bridge's expected service life of 58 years and strengthening it increased to 85 years.
某钢筋混凝土箱梁桥挠度时变可靠度分析
在混凝土浇筑之前,需要对桥梁施工中的弧度规定进行适当的监督和注意。同样重要的是,要使用适当的质量控制手册,注意钢筋的放置,并在施工开始前进行高水平的模板设计。如果这些问题没有得到妥善解决,结构的性能将受到影响。本文以一座40.5m箱梁钢筋混凝土桥梁为研究对象,对该桥梁在没有适当拱度的情况下的性能进行了研究。由于拱度是所调查桥梁最重要的问题,因此将其对强度和使用性能要求的影响与标准进行了比较。使用Arduino型加速度计进行动态负载测试,以评估桥的当前状况与可用性限制要求的关系。考虑钢筋腐蚀、徐变和荷载强度增加引起的钢筋混凝土(RC)截面劣化以及相应的统计分布,以估计桥梁挠度的长期影响。时变分析结果表明,当桥梁预期使用寿命为58年时,挠度可靠度指标呈线性下降趋势,加固后桥梁预期使用寿命增加到85年。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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