A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Planar Crack Approach to Evaluate the Flexural Strength of Fiber-Reinforced Concrete Sections
[Abstract] : This article describes a model based on concepts of Fracture Mechanics to evaluate the flexural strength of fiber-reinforced concrete (FRC) sections. The model covers the need by structural engineers to have tools that allow, in a simple way, the designing of FRC sections and avoiding complex calculations through finite elements. It consists of an analytical method that models FRC post-cracking behavior with a cohesive linear softening law (σ − w). We use a compatibility equation based on the planar crack hypothesis, i.e., the assumption that the crack surfaces remain plane throughout the fracture process, which was recently proven true using digital image correlation. Non-cracked concrete bulk follows a stress–strain law (σ − ε) combined with the Bernoulli–Navier assumption. We define a brittleness number derived from non-dimensional analyses, which includes the beam size and the softening characteristics. We show that this parameter is key to determining the FRC flexural strength, characterizing fiber-reinforced concrete, and reproducing the size-effect of sections in flexure. Moreover, we propose an expression to calculate the flexural strength of FRC as a function of the cited brittleness number. The model also gives the ratio between the residual strength in service conditions and the flexural strength. Model results show a good agreement with tests in the scientific literature. Finally, we also analyze the brittle–ductile transition in FRC sections. ; Spanish Ministry of Science, Innovation and Universities through grant DIN-2018-009940. Moreover, PID2019-110928RB-C31 and RTC-2017-6736-3 from the same funder, and grant SBPLY/19/180501/000220 from the Junta de Comunidades de Castilla-La Mancha Spain.
Planar Crack Approach to Evaluate the Flexural Strength of Fiber-Reinforced Concrete Sections
[Abstract] : This article describes a model based on concepts of Fracture Mechanics to evaluate the flexural strength of fiber-reinforced concrete (FRC) sections. The model covers the need by structural engineers to have tools that allow, in a simple way, the designing of FRC sections and avoiding complex calculations through finite elements. It consists of an analytical method that models FRC post-cracking behavior with a cohesive linear softening law (σ − w). We use a compatibility equation based on the planar crack hypothesis, i.e., the assumption that the crack surfaces remain plane throughout the fracture process, which was recently proven true using digital image correlation. Non-cracked concrete bulk follows a stress–strain law (σ − ε) combined with the Bernoulli–Navier assumption. We define a brittleness number derived from non-dimensional analyses, which includes the beam size and the softening characteristics. We show that this parameter is key to determining the FRC flexural strength, characterizing fiber-reinforced concrete, and reproducing the size-effect of sections in flexure. Moreover, we propose an expression to calculate the flexural strength of FRC as a function of the cited brittleness number. The model also gives the ratio between the residual strength in service conditions and the flexural strength. Model results show a good agreement with tests in the scientific literature. Finally, we also analyze the brittle–ductile transition in FRC sections. ; Spanish Ministry of Science, Innovation and Universities through grant DIN-2018-009940. Moreover, PID2019-110928RB-C31 and RTC-2017-6736-3 from the same funder, and grant SBPLY/19/180501/000220 from the Junta de Comunidades de Castilla-La Mancha Spain.
Planar Crack Approach to Evaluate the Flexural Strength of Fiber-Reinforced Concrete Sections
Carmona, Jacinto R. (author) / Cortés-Buitrago, Raúl (author) / Rey-Rey, Juan (author) / Ruiz, Gonzalo (author)
2022-01-01
Article (Journal)
Electronic Resource
English
DDC:
621
Ultimate flexural strength of reinforced concrete sections
| Engineering Index Backfile | 1967
Minimum reinforcement for flexural strength of reinforced concrete sections
| British Library Online Contents | 2002
Flexural Behavior of Laterally Reinforced High-Strength Concrete Sections
| Online Contents | 1996
A New Model to Assess the Flexural Strength of Steel-Fiber Reinforced Concrete Sections
| Springer Verlag | 2023