Fatigue tests on straight steel–concrete composite beams subjected to hogging moment

Lin, Weiwei; Yoda, Teruhiko; Taniguchi, Nobuyuki

doi:10.1016/j.jcsr.2012.09.009

Cited by 47 publications

(13 citation statements)

References 11 publications

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“…The concrete flange was attached to the steel beam using shear studs, as shown in Figure 2(b). Lin et al (2013) tested three continuous composite beams subjected to cyclic loads. The initial static test in this investigation was selected to validate Model 3.…”

Section: Fe Validationmentioning

confidence: 99%

Parametric study for post-tensioned composite beams with external tendons

El‐Zohairy

Salim

2017

Advances in Structural Engineering

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Strengthening of bridge superstructures composite beams with external post-tensioned tendons is a good technique for strengthening the existing structures. In this study, a numerical model is illustrated to study the nonlinear simulation of composite beams stiffened with externally post-tensioned tendons. The accuracy of the developed numerical model is validated using comparisons between the numerical and existing test data. The influence of various strengthening parameters is investigated, which include draped versus straight tendons, tendon length, the effect of post-tensioning on reinstating the flexural behavior of an overloaded beam, tendon eccentricity, and the degree of shear connection. A good agreement between the proposed model and the test data is obtained. The results demonstrate that at the same tendon eccentricity, the trapezoidal profile shows better behavior for the strengthened beams. However, more ductility is obtained when using the straight tendon profile. Applying post-tensioning through the beam of full length helps to reduce the creation of fatigue cracks, which always start at stress raisers, and subsequently increases the fatigue life of the composite beam. Also, the external post-tensioning effectively maintains the flexural behavior of the overloaded strengthened beam after unloading in comparison to the un-strengthened beam. It is observed that 80% degree of shear connection or higher is recommended to obtain the desired performance of the external post-tensioning force for strengthening composite beams.

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Section: Fe Validationmentioning

confidence: 99%

Parametric study for post-tensioned composite beams with external tendons

El‐Zohairy

Salim

2017

Advances in Structural Engineering

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“…On the basis of the field test results and numerical results reported herein, together with the previous laboratory test results (Lin et al, 2013c), the present strengthening method was proved to be effective for strengthening the aged steel railway bridges. In addition, according to the previous studies (Lin et al, 2013a(Lin et al, , 2014b, when the repeated load was smaller than that of the initial cracking load of the concrete, cyclic (or fatigue) loading will not obviously affect the static loading behavior of the composite structures. For the present strengthening method, the concrete was designed to resist the service load without any cracking.…”

Section: Nonlinear Analysis Resultsmentioning

confidence: 83%

Renovation of existing steel railway bridges: Field test and numerical simulation

Lin

Taniguchi

Yoda

et al. 2017

Advances in Structural Engineering

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Renovation of the aged steel railway structures is of vital importance due to their long service life after completion. A strengthening method for aged steel railway bridges by using rubber-latex mortar, glass fiber-reinforced polymer plates, lightweight rapid hardening concrete, and reinforcing bars was introduced in this article. To confirm the real effect of the present strengthening method, field tests were performed on two aged steel railway bridges that have been in service for 87 and 61 years, respectively. Stress variations on the mid-span section of the railway bridge due to the running trains were measured in the field test, and the stress reduction effects as well as the load redistribution effects of the present strengthening method were also confirmed. Three-dimensional finite-element models were built, and the numerical results were in good agreement with the field test results. Besides, structural vibration and noise levels of both strengthened and un-strengthened railway bridges were measured, and the noise reduction effect of the present method was confirmed in the field tests. In addition, further nonlinear analyses were performed, and the applied load-displacement relationships as well as the load-normal longitudinal strain curves of the aged structural steel, the glass fiber-reinforced polymer plates and the rapid hardening concrete, were given. Both experimental and numerical results indicate that the present renovation method can greatly enhance the stiffness and reduce the stress levels of steel members, resulting in the extension of the residual service life of the aged steel railway bridges.

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“…De acordo com a literatura, esta dispersão pode ser explicada porque o concreto é um material heterogêneo, sendo assim a tensão de ruptura varia de um corpo de prova para o outro e, como não é possível ensaiar o mesmo corpo de prova que foi rompido, para determinar a resistência à flexão simples sob carga centrada, a relação entre tensões varia ainda mais de uma amostra para a outra. Talvez, devido a este problema, alguns autores optam por aplicar tensões mais baixas, com ciclos pré-estabelecidos, e apresentam medidas de deformação sem ruptura dos corpos de prova [16,19,23].…”

Section: Figura 8: Resultados Do Ensaio De Fadigaunclassified

Estudo do comportamento mecânico do concreto com borracha de pneu

et al. 2016

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RESUMOEste estudo trata da análise das propriedades mecânicas do concreto, elaborado a partir da substituição de parte do agregado miúdo por borracha de pneu triturado. Foram realizados testes experimentais em corpos de prova submetidos à compressão axial, flexão simples sob carga centrada e fadiga. As medições foram feitas em três traços de concreto: 1) concreto sem borracha (denominado na presente pesquisa por concreto de referência); 2) concreto com borracha e consumo de cimento igual ao de referência; e 3) concreto com borracha e acréscimo de cimento até a obtenção da resistência do concreto de referência. Os resultados obtidos mostram que a adição de borracha provoca redução na resistência mecânica do concreto, o que pode reduzir as aplicações deste novo material. A presença da borracha também conferiu um menor módulo de elasticidade ao concreto, o que pode ser desejável em situações envolvendo ações de impacto, forças dinâmicas e fadiga. Além dessa vantagem, a aplicação da borracha de pneu no concreto contribui na reciclagem de um material poluente e que normalmente é descartado no meio ambiente. Palavras-chave: concreto; borracha de pneu; propriedades mecânicas. ABSTRACTThis study discusses the mechanical properties of concrete, elaborated from the partial replacement of fine aggregate by crushed rubber. It was made experimental tests in specimens submitted to axial compression, Young's modulus (stiffness), three-point bending flexural and fatigue. The measurements were performed on three mixtures: 1) concrete without rubber (denominated as reference concrete), 2) concrete with rubber and the consumption of cement equal of reference and 3) concrete with rubber and the addition of cement on the mixture until it obtains the same strength of the reference concrete. The results have indicated that adding rubber in concrete decreases the strength, which could reduce the application of this new material. The rubber also decreased the elastic modulus; this could improve the behavior of materials in situations involving impact actions, dynamics loads and fatigue. Furthermore, this new composite contributes on rubber tire recycling processes.

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Fatigue tests on straight steel–concrete composite beams subjected to hogging moment

Cited by 47 publications

References 11 publications

Parametric study for post-tensioned composite beams with external tendons

Parametric study for post-tensioned composite beams with external tendons

Renovation of existing steel railway bridges: Field test and numerical simulation

Estudo do comportamento mecânico do concreto com borracha de pneu

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