A time and cost-effective strengthening of RC half joint bridges exposed to brittle failure: application to a case study

IF 2.6 3区 工程技术 Q2 ENGINEERING, CIVIL Structure and Infrastructure Engineering Pub Date : 2023-11-02 DOI:10.1080/15732479.2023.2275689
Mauro Sassu, Mario Lucio Puppio, Fabio Doveri, Martina Ferrini, Fausto Mistretta
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Abstract

AbstractThis paper addresses the strengthening of a reinforced concrete (RC) road bridge with Gerber-type beams, prompted by the recent collapses of some Italian bridges. The study discusses the characteristics of half-joint bridges, also known as Gerber beam types. These designs, originating in the late 1800s and commonly utilized from the 1950s to the 1970s, exhibit an isostatic structure. While they are easy to design, typically featuring pairs of piers with symmetrical cantilevers and two or more suspended spans, they often suffer from weakening of the half joints (saddles), necessitating structural consolidation. Designers have proposed several solutions to strengthen this type of bridges and the approach presented in this paper focuses on cost-effectiveness and efficiency. It involves a gradual demolition of longitudinal strips on the RC slab of suspended beams, followed by the installation of new steel beams to create a mixed RC-steel system. The application of this method is illustrated in a double-pier bridge spanning the Arno River, Italy. The bridge’s rehabilitation required a complete closure of the traffic road for twelve weeks, followed by alternating traffic for twenty-four weeks. The paper discusses both the design and construction aspects of the proposed intervention, considering costs and implementation time. Furthermore, a low-cost health monitoring procedure is briefly introduced.Keywords: Brittle collapsecomposite steel structuresconstruction phasesgerber beamhealth monitoring strategylow-cost rehabilitationRC bridge strengtheningroad bridge AcknowledgementsThe authors thanks to C. Ristori of the technical staff of the District of Pisa for data collected, together with C. Ricci and G. Mariani (RI-MA Engineering, Lucca) for co-operation during works. The Ministry of University and Research for project PRIN 2020 S-MoSES. The Consortium RELUIS-CSLLPP project for Monitoring Bridges and DPC-RELUIS 2022-2024 WP5.4Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe financial support is given by the Research Project ‘Smart Monitoring for Safety of Existing Structures and infrastructures’ (S-MoSES) financed by Italian Ministry of University and Research PRIN 2020 – D.R. N.607 - 3th July 2020.
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钢筋混凝土半节理桥梁脆性破坏的时间和经济有效的加固:应用于实例研究
摘要本文讨论了用格伯式梁加固一座钢筋混凝土(RC)公路桥的问题,这是由于最近一些意大利桥梁的倒塌而引起的。该研究讨论了半节理桥梁的特点,也被称为格伯梁类型。这些设计起源于19世纪末,在20世纪50年代至70年代普遍使用,呈现出均衡结构。虽然它们很容易设计,通常具有对称悬臂和两个或更多悬跨的成对墩,但它们经常遭受半关节(鞍座)的削弱,需要结构加固。设计师们已经提出了几种加强这类桥梁的解决方案,本文提出的方法侧重于成本效益和效率。它包括逐步拆除悬挂梁的钢筋混凝土板上的纵向条,然后安装新的钢梁,以创建混合钢筋混凝土系统。该方法在意大利阿尔诺河上的一座双墩大桥上得到了应用。这座桥的修复需要完全关闭交通道路12周,然后是24周的交替交通。本文在考虑成本和实施时间的情况下,讨论了拟议干预措施的设计和施工方面。此外,还简要介绍了一种低成本的健康监测方法。关键词:钢脆性collapsecomposite structuresconstruction phasesgerber beamhealth监测strategylow-cost rehabilitationRC桥strengtheningroad AcknowledgementsThe作者由于c Ristori比萨的地区的技术人员收集的数据,以及c·里奇和g·马里安尼(RI-MA工程、卢卡)合作期间有效。大学和研究部项目PRIN 2020 S-MoSES。RELUIS-CSLLPP项目监测桥梁和DPC-RELUIS 2022-2024 wp5.4披露声明作者未报告潜在的利益冲突。资金支持由意大利大学和研究部资助的“现有结构和基础设施安全智能监测”(S-MoSES)研究项目提供,该项目由PRIN 2020 - dr . N.607 - 2020年7月3日资助。
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来源期刊
Structure and Infrastructure Engineering
Structure and Infrastructure Engineering 工程技术-工程:机械
CiteScore
9.50
自引率
8.10%
发文量
131
审稿时长
5.3 months
期刊介绍: Structure and Infrastructure Engineering - Maintenance, Management, Life-Cycle Design and Performance is an international Journal dedicated to recent advances in maintenance, management and life-cycle performance of a wide range of infrastructures, such as: buildings, bridges, dams, railways, underground constructions, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, airplanes and other types of structures including aerospace and automotive structures. The Journal presents research and developments on the most advanced technologies for analyzing, predicting and optimizing infrastructure performance. The main gaps to be filled are those between researchers and practitioners in maintenance, management and life-cycle performance of infrastructure systems, and those between professionals working on different types of infrastructures. To this end, the journal will provide a forum for a broad blend of scientific, technical and practical papers. The journal is endorsed by the International Association for Life-Cycle Civil Engineering ( IALCCE) and the International Association for Bridge Maintenance and Safety ( IABMAS).
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