Reinforced concrete corbels strengthened with external prestressing

Romanichen, Romulo Menk; Souza, Rafael Alves de

doi:10.1590/s1983-41952019000400006

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Using the three types of STMs shown in Figure 1, the authors predicted 380 RC corbels' failure strengths to examine the properness of the existing and proposed strength values of concrete struts and nodal zones. The corbels were tested by Kriz [43], Al-Talqany and Alhussainy [44], and Shakir [45]. Table 1 shows the specifications and ranges of the primary design variables of the corbels.…”

Section: Verificationsmentioning

confidence: 99%

Strengths of Struts and Nodal Zones for Strut-and-Tie Model Design of Reinforced Concrete Corbels

Yun

Lee

2021

Civ Eng J

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The strut-and-tie model (STM) method is useful for the limit state design of reinforced concrete (RC) corbels. However, for the rational design of RC corbels, designers must accurately determine the strengths of concrete struts and nodal zones to check the strength conditions of a selected STM and the anchorage of reinforcing bars in nodal zones. In this study, the authors suggested a numerical process for determining the strengths of concrete struts and nodal zones in RC corbel STMs. The technique incorporates the state of two-dimensional (2-D) stresses at the strut and nodal zone locations, 2-D failure envelope of concrete, deviation angle between the strut orientation and compressive principal stress trajectory, and the effect of concrete confinement by reinforcing bars. The authors also proposed the strength equations of struts and nodal zones that apply to the typical determinate and indeterminate STMs of RC corbels. The authors considered the effects of the shear span-to-effective depth ratio, the horizontal-to-vertical load ratio, and the primary tensile and horizontal shear reinforcement ratios in developing the strength equations. The authors predicted the failure strengths of 391 RC corbels tested to examine the appropriateness of the proposed numerical process and strength equations. The predicted failure strength compares very well with experimental results, proving that the rational analysis and design of RC corbels are possible by using the present study's strut and nodal zone strengths. Doi: 10.28991/cej-2021-03091725 Full Text: PDF

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Section: Verificationsmentioning

confidence: 99%

Strengths of Struts and Nodal Zones for Strut-and-Tie Model Design of Reinforced Concrete Corbels

Yun

Lee

2021

Civ Eng J

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“…Consoles são peças utilizadas nas estruturas pré-moldadas com a finalidade de realizar as ligações entre os elementos estruturais: viga-pilar, viga-viga e também para ligações laje-parede ou até para permitir a execução de juntas de dilatação nas estruturas das edificações (ACKER, 2002;ROMANICHENR;SOUZA, 2019).…”

Section: Introductionunclassified

Análise da eficiência de diferentes métodos de execução de consoles pré-moldados

Centenaro

Baruffi

Silveira

et al. 2022

PERSP

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A indústria dos pré-moldados vivencia transformações importantes para atender as exigências do mercado. É de grande importância a preocupação de métodos e modelos de execução dos sistemas construtivos tradicionais. As estruturas de concreto pré-moldado possuem rapidez na execução, propiciada pela facilidade que os consoles trazem no encaixe das peças. Devido a alta produtividade, as empresas de estruturas pré-fabricadas vêm adotando formas alternativas para solucionar a execução dos consoles em pilares pré-fabricados, dadas as dificuldade existentes, já que a NBR 9062 (ABNT, 2017) não menciona esta questão. O trabalho realiza um estudo experimental de diferentes métodos executivos de consoles, sendo eles, o método da concretagem simultânea, método das barras amarradas e método da concretagem posterior, mostrando a execução das ligações nas estruturas pré- moldadas e analisando o comportamento frente às cargas aplicadas. Os resultados demonstram que o método da concretagem simultânea pilar e console é mais eficaz, juntamente ao método da concretagem posterior. Todavia, há necessidade de precaução na execução do método das barras amarradas, que apesar de ter suportado a carga considerada no cálculo estrutural, não deixou margens de segurança como os demais métodos.

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“…The prestressing method that had gained popularity primarily in the strengthening of existing bridge structures [20] consists of unbonded prestressing which is defined as a system in which the post-tensioning tendons or bars are located outside the concrete cross-section and the prestressing forces are transmitted to the girder through end anchorages, deviators, or saddles. The prestressing method can effectively improve the bearing capacity of structural members by applying external prestressing [2], and can be applied to the reinforcement of structural members in large-span and heavy-duty workshops [21]. It was also proven to effectively repair reinforced concrete structural members with large deformation [14], so it has been widely used in industrial buildings.…”

Section: Introductionmentioning

confidence: 99%

Application of Buckling Restrained Braces to Upgrade Vertical Stiffness of Existing RC Frames

Niyonyungu

Farsangi

2020

Civil and Environmental Engineering Reports

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In this paper, based on the RC frame structure of an industrial building, the finite element model of the structure is developed, according to the Chinese code for seismic design of buildings [9]. Considering the lack of seismic performance, the buckling restrained brace (BRB) is adopted for seismic retrofitting, and various configurations of buckling restrained support are considered for reinforcement. The elastic response spectrum analysis (RSA) and direct integration nonlinear time history analyses (NL-TH) are carried out for the frame structure before and after reinforcement using ETABS finite element software. From the joints displacement, inter-story displacement, inter-story shear force, acceleration, energy dissipation, and other aspects of the seismic response of the strengthened structure and the non-strengthened structure, the comparison has been made. The effect of buckling restrained support and common support on the existing building structure is verified through analytical modeling. After reinforcement, there is a 40%, 39.3%, 40%, 36.4%, and 38.3% reduction in the first period of vibration after the building is strengthened by inverted BRB, V BRB, two-story BRB, single BRB, and ordinary steel braces, respectively. Strengthening of the structure by buckling restrained braces and ordinary steel braces both decrease the original building displacement by more than 50% from the first to the fourth floor. Under severe earthquakes, the use of BRB reduced the column shear by 46.6%; similarly, the incorporation of ordinary steel braces reduced the column shear by 4.72%. It is concluded that using buckling restrained braces will increase the vertical stiffness of the structure to a very high extent.

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Reinforced concrete corbels strengthened with external prestressing

Cited by 7 publications

References 5 publications

Strengths of Struts and Nodal Zones for Strut-and-Tie Model Design of Reinforced Concrete Corbels

Strengths of Struts and Nodal Zones for Strut-and-Tie Model Design of Reinforced Concrete Corbels

Análise da eficiência de diferentes métodos de execução de consoles pré-moldados

Application of Buckling Restrained Braces to Upgrade Vertical Stiffness of Existing RC Frames

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