Hormigon y Acero最新文献_第2页

Experiencias en el cálculo de Interacción vía-estructura en viaductos de trenes ligeros urbanos 城市轻轨高架桥轨道结构相互作用计算经验

IF 0.1

Hormigon y Acero Pub Date : 2023-05-08 DOI: 10.33586/hya.2023.3123

L. Carrillo, Mariano Martín, Pedro De Dios, C. García, Diego Romagosa

引用次数: 0

Influence of Track Typology on the Dynamic Response of Short-Span High-Speed Railway Bridges 轨道类型对短跨度高速铁路桥梁动力响应的影响

IF 0.1

Hormigon y Acero Pub Date : 2023-04-25 DOI: 10.33586/hya.2023.3120

Elena Pilar Martínez, G. Ulzurrun, C. Zanuy

{"title":"Influence of Track Typology on the Dynamic Response of Short-Span High-Speed Railway Bridges","authors":"Elena Pilar Martínez, G. Ulzurrun, C. Zanuy","doi":"10.33586/hya.2023.3120","DOIUrl":"https://doi.org/10.33586/hya.2023.3120","url":null,"abstract":"It is known that short-span high-speed railway viaducts are prone to suffer significant dynamic effects due to the passage of moving train loads. Recent technological advances in railway engineering have resulted in track typologies different from the conventional ballasted track consisting of discrete sleepers fastened to the rails and resting on a ballast bed. In particular, ballastless track has been identified as an effective solution due to reduced maintenance costs, high track stability and excellent geometric quality. Though different track typologies are available in the market, they can be classified as monolithic or independent according to the interaction degree with the bridge girder. In the present paper, the dynamic behaviour of short-span bridges is numerically studied by taking into account the track-bridge interaction by modelling explicitly the components of the track. Two types of ballastless track (monolithic continuous slab and independent short slabs) and conventional ballasted track are considered on simply supported bridges with span length in the range of 15-25 m subjected to envelope and commercial train loads at speeds between 200 and 360 km/h. In total, 2448 numerical cases have been analyzed. The study shows that dynamic deflections and accelerations produced at the bridge girder by moving train loads can be reduced when the ballasted track is replaced to ballastless track systems, especially for the critical speeds higher than 300 km/h. Moreover, it is shown that the two ballastless track systems lead to very similar results, with the monolithic system resulting in slightly smaller bridge deflections and also moderately larger accelerations.","PeriodicalId":41423,"journal":{"name":"Hormigon y Acero","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44032313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design 结构混凝土抗剪性能问题及力学模型解答。基于性能的剪切设计的挑战

IF 0.1

Hormigon y Acero Pub Date : 2023-04-20 DOI: 10.33586/hya.2023.3116

A. Marí

{"title":"Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design","authors":"A. Marí","doi":"10.33586/hya.2023.3116","DOIUrl":"https://doi.org/10.33586/hya.2023.3116","url":null,"abstract":"The shear behavior and strength of reinforced and prestressed concrete structures is difficult to predict due to the complex resistant mechanisms that are mobilized and the different types of failure that can occur. This has given rise to many of the simplified formulations previously developed for shear calculation being empirical in nature, which lack a clear theoretical basis and they do not provide qualitative information on structural behavior. Therefore, performance-based design becomes difficult using such types of formulations. In this paper, some questions about shear behavior and design are raised, apparently without an immediate answer from the performance point of view, and possible answers based on structural mechanics are provided. The physical phenomena that determine the shear behavior, the resistant mechanisms that are developed, the fundamental parameters that govern them, to what extent they influence and how they are contemplated in some simplified formulations are analyzed. The importance of mechanical models is raised and some examples of how these models can be naturally adapted to multiple project situations, evaluation and reinforcement of existing structures are shown.","PeriodicalId":41423,"journal":{"name":"Hormigon y Acero","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49505694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Some Highlights on the New Version of EN 1992-1-2 (Eurocode 2, Fire Part) 新版EN 1992-1-2（欧洲规范2，消防部分）的一些亮点

IF 0.1

Hormigon y Acero Pub Date : 2023-03-31 DOI: 10.33586/hya.2023.3096

S. Carrascón, F. Robert, Carlos Villagrá

引用次数: 1

Design of Steel Fibre Reinforced Concrete Structures According to the Annex L of the Eurocode-2 2023 根据欧洲规范-2 2023附录L的钢纤维混凝土结构设计

IF 0.1

Hormigon y Acero Pub Date : 2023-03-30 DOI: 10.33586/hya.2023.3124

A. de la Fuente, Andrea Monserrat-López, N. Tošić, P. Serna

引用次数: 0

Durability and Cover Depth Provisions in Next Eurocode 2. Background Modelling and Calculations 下一个欧洲法规2中的耐久性和覆盖深度规定。背景建模和计算

IF 0.1

Hormigon y Acero Pub Date : 2023-03-21 DOI: 10.33586/hya.2023.3102

C. Andrade, D. Izquierdo

{"title":"Durability and Cover Depth Provisions in Next Eurocode 2. Background Modelling and Calculations","authors":"C. Andrade, D. Izquierdo","doi":"10.33586/hya.2023.3102","DOIUrl":"https://doi.org/10.33586/hya.2023.3102","url":null,"abstract":"Codes contain calculation rules of general acceptance that have demonstrated to enable the building of safe enough structures with very low probability of failure. Any new method to be introduced, should be based in a consensus among experts and based in the experience. Until present, the durability is treated in the Codes following the so called “prescriptive” approach that is based in the limiting of the constituents of concrete, applying a correct curing and limiting the presence of deleterious substances as chlorides and the crack related to serviceability conditions. In the paper are described the changes introduced in the verification of durability in the new current draft of EN 1992-1-1:2010. The main changes are based in a first trial to make durability design by a performance approach to the cover depths for avoiding reinforcement corrosion that were calculated through service life models, but the covers are given in function of a new concept: the Exposure Resistance classes (ERC) which substitute the present “structural classes”. The calculations are not explicit in the Code, because they do not intrinsically imply a higher precision, but only more rational and harmonization to solve some inconsistences. In the paper is also presented the definition and scope of the ERC’s which will be regulated in a next draft standard named: EN206-100. Present method to verify the durability as indicated in present EN-206 (reproduced in Annex P of the current draft of EN 1992-1-1), will be retained for a transition period and it could continue to be applied. Providing the method introducing the ERC’s is based in a new approach and safety format, the coherence with this previous method cannot be guaranteed, but the application of one or other route will give the desired level of durability.","PeriodicalId":41423,"journal":{"name":"Hormigon y Acero","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45027871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Eurocode Practice: Design of Fastenings for Use in Concrete in Accordance with EC2, Part 4 (EN 1992-4) 欧洲规范实施规程:根据EC2第4部分设计混凝土用紧固件(EN 1992-4)

IF 0.1

Hormigon y Acero Pub Date : 2023-03-20 DOI: 10.33586/hya.2023.3108

J. Appl, Antonio Cardo

{"title":"Eurocode Practice: Design of Fastenings for Use in Concrete in Accordance with EC2, Part 4 (EN 1992-4)","authors":"J. Appl, Antonio Cardo","doi":"10.33586/hya.2023.3108","DOIUrl":"https://doi.org/10.33586/hya.2023.3108","url":null,"abstract":"Since 1997, the design of fastenings for anchoring in concrete has been regulated at European level by Annex C of the European Technical Approval Guideline and the subsequently published, supporting and referenced “Technical Report” TR029 and TR045 or by the pre-standard series CEN/TS 1992-4. The new EN 1992-4 standard, which is published in 2017 and has been formally accepted by the CEN members in the voting process. It summarizes the existing design rules while taking into account state of the art and applies to all main fasteners used in construction engineering. It is far more comprehensive in terms of the fastening systems it covers, and the load conditions it takes into consideration. Consequently, it represents an important and necessary step in harmonizing the design of fasteners for use in concrete. The following paper briefly presents the contents of the new European Standard EN 1992-4 “Design of fasteners for use in concrete” and the major changes that have been introduced compared to CEN/TS 1992-4 and ETAG 001, Annex C. \u0000There is an added chapter regarding “post-installed rebar anchorage length”, which is cover by new EN1991-1-1. This application is used for design of rigid connection between concrete members.","PeriodicalId":41423,"journal":{"name":"Hormigon y Acero","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46702702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue in Structural Concrete According to the New Eurocode 2 根据新欧洲规范2的结构混凝土疲劳

IF 0.1

Hormigon y Acero Pub Date : 2023-03-20 DOI: 10.33586/hya.2023.3100

Carlos C Ríos, J. C. Lancha, M. Vicente

引用次数: 1

State-of-the-Art review of Synthetic Fibres as Shear Reinforcement in Concrete Elements 合成纤维作为混凝土构件抗剪钢筋的研究进展

Hormigon y Acero Pub Date : 2023-03-16 DOI: 10.33586/hya.2023.3106

Juan Navarro-Gregori

引用次数: 0

Comportamiento del hormigón reforzado con fibras de acero conforme a la teoría de corte-fricción 根据剪切-摩擦理论的钢纤维混凝土性能

IF 0.1

Hormigon y Acero Pub Date : 2023-03-15 DOI: 10.33586/hya.2023.3110

Álvaro Picazo, Jaime Carlos Gálvez Ruiz, M. G. Alberti, A. Enfedaque

{"title":"Comportamiento del hormigón reforzado con fibras de acero conforme a la teoría de corte-fricción","authors":"Álvaro Picazo, Jaime Carlos Gálvez Ruiz, M. G. Alberti, A. Enfedaque","doi":"10.33586/hya.2023.3110","DOIUrl":"https://doi.org/10.33586/hya.2023.3110","url":null,"abstract":"La cuantía del refuerzo tradicional de barras de acero en el hormigón armado se puede reducir mediante la adición de fibras. Este tipo de hormigón, con fibras de acero, se denomina hormigón reforzado con fibras de acero (HRFA) y permite la eliminación total o parcial de la armadura ante esfuerzos cortantes. Diferentes normativas consideran la capacidad estructural de las fibras de acero, para cualquier tipo de esfuerzo, en función de valores de resistencias residuales a flexión. No parece adecuado emplear estas resistencias para dimensionar el HRFA frente a solicitaciones de cortante, por lo que se desarrolló la presente investigación y se analizaron dos HRFA, solicitados a cortante, comparándolos con su estudio teórico en relación a la teoría de corte-fricción. Las fibras de acero cosen las fisuras impidiendo se desarrollen libremente, aumentando el rozamiento entre las caras de la discontinuidad. La parte experimental desarrolló ensayos de corte directo tipo “push-off” complementados con técnica de vídeo-extensometría para obtener las variaciones de deslizamiento y abertura de fisura. Se puede indicar que, en el estado post-fisuración, las fibras son las que gobiernan el comportamiento del material y que los resultados del modelo analítico son muy similares a los hallados en la campaña experimental para deslizamientos de hasta algo más de 4 mm.","PeriodicalId":41423,"journal":{"name":"Hormigon y Acero","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44290305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0