Mauro Sassu, Mario Lucio Puppio, Fabio Doveri, Martina Ferrini, Fausto Mistretta
{"title":"A time and cost-effective strengthening of RC half joint bridges exposed to brittle failure: application to a case study","authors":"Mauro Sassu, Mario Lucio Puppio, Fabio Doveri, Martina Ferrini, Fausto Mistretta","doi":"10.1080/15732479.2023.2275689","DOIUrl":null,"url":null,"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.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structure and Infrastructure Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/15732479.2023.2275689","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
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.
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).