Article
Construction & Building Technology
S. S. Zhang, J. J. Wang, Guan Lin, T. Yu, D. Fernando
Summary: This paper presents an experimental study on the triaxial compressive behavior of ultra-high performance concrete (UHPC) and ultra-high performance fiber reinforced concrete (UHPFRC). The results show that lateral hydraulic pressure significantly enhances the strength and ductility of UHPC and UHPFRC. The presence of steel fibers has significant effects on the axial stress-axial strain behavior and the dilation behavior of UHPC and UHPFRC. New axial stress-axial strain models and an equation for the axial strain-lateral strain relationship for UHPC and UHPFRC are proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Zhenhuan Xu, Jun Li, Pengtao Wu, Chengqing Wu
Summary: This study investigates the effect of elevated temperatures on hybrid steel and polypropylene fibre reinforced ultra-high performance concrete (UHPC) under uniaxial and triaxial compression states. Through material and structural tests, the high temperature impact on UHPC's strength is discussed and an empirical model for reproducing the triaxial compression stress-strain curves of UHPC after elevated temperature is proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Qi Cao, Xianrui Lv, Yanlei Wang, Zhimin Wu, Zhibin Lin
Summary: The study reveals that actively confined high-strength concrete has a better strength enhancement effect under different loading modes, reducing brittle macro cracking and increasing hoop rupture strain with the increase of confinement. Additionally, the stress degradation rate of unidirectional GFRP actively confined high-strength concrete is remarkably improved due to the compactness of core concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Muhamad Soffi Manda, Mohd Ruzaimi Mat Rejab, Shukur Abu Hassan, Mat Uzir Wahit, Didik Nurhadiyanto
Summary: Studies have shown that carbon fibre-reinforced plastic confinement can enhance the strength of tin slag polymer concrete up to 128%. However, the effect of metallic material confinement has not been studied yet. This study experimentally investigates the strengthening of tin slag polymer concrete using a machined mild steel metal tube under compressive loads. The results show that the compressive strength of the concrete is improved by applying metal tube confinement.
Article
Geochemistry & Geophysics
Antonio Salazar Vasquez, Carlo Rabaiotti, Leonid N. Germanovich, Alexander M. Puzrin
Summary: This study conducted experiments using optical fibers to measure distributed strains in different materials, and the results showed that strain localization occurs before failure. Compared to point sensing methods, the use of distributed methods provides more measurements and reveals the overall deformation of the sample surface.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Mechanics
K. C. Liu, C. Jiang, T. Yu, J. G. Teng
Summary: This paper presents a systematic experimental study on the axial compressive behavior of elliptical FRP tube-confined concrete columns (EFCCCs). The study found that the confinement effectiveness of FRP tubes in EFCCCs decreases with the aspect ratio and concrete strength, but increases with the FRP tube thickness. The fiber orientations in the FRP tube have a significant effect on the confinement effectiveness and failure mode of EFCCCs. Based on the test results, a new stress-strain model for the concrete in EFCCCs is proposed, which includes a more rigorous treatment of the confinement stiffness and can provide more accurate predictions for the whole stress-strain curve than existing models.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Geological
Xiaoliang Wang, Yixin Zhao, Xulong Zhang, Zhuang Sun, Yirui Gao, Yaodong Jiang
Summary: This article investigates the effects of anisotropy on the strength and deformability of anthracite coal, and evaluates anisotropic failure criteria and prediction methods for strength. The study also discusses the influences of anisotropy and confining pressure on mechanical parameters and failure patterns. The findings provide insights into the fracture mechanisms and deformation behavior of anthracite under different conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Liang Huang, Jianhe Xie, Liming Li, Baoqin Xu, Peiyan Huang, Zhongyu Lu
Summary: This study investigated the compressive behavior of confined ultra-high performance concrete (UHPC) with carbon FRP sheets under cyclic axial compression, and proposed a new stress-strain model for FRP-confined UHPC. The model reasonably predicts the stress-strain responses of FRP-confined UHPC.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Medine Ispir, Korhan Deniz Dalgic, Alper Ilki
Summary: This study aims to define the cyclic axial behavior of hybrid FRP-confined concrete based on experimental results, proposing a stress-strain model for the cyclic response and revealing the characteristics of confined concrete with different fiber sheet combinations.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Construction & Building Technology
Gholamreza Baghban Golpasand, Masood Farzam
Summary: This study investigated the behavior of recycled steel fiber-reinforced concrete under true triaxial tests. The presence of recycled steel fibers was found to have a significant effect on the behavior of the specimens in the post-peak area. Additionally, the study showed that the higher the density of recycled steel fibers, the higher the final triaxial strength in load combinations close to the tensile meridian.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hong Li, Jiajian Lin, Xiaobao Lei, Tianxia Wei
Summary: In this paper, a strength prediction model of basalt fiber concrete is constructed using the random forest method, and the influence of fiber size and content on its strength is studied. The results show that the random forest prediction model has high accuracy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Construction & Building Technology
Xiao Jiang, Qinghua Li, Xing Yin, Shilang Xu
Summary: Ultra high toughness cementitious composites (UHTCC) with significant strain capacity and high toughness are expected to improve the performance of engineering structures. This study discusses the triaxial compressive behavior of UHTCC under different confining pressures, showing increased deviatoric strength, peak axial strain, and peak lateral strain with increasing confining pressure. The toughness index reflects the energy absorption capacity of UHTCC. UHTCC is expected to perform well in important civil and military engineering applications.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Mechanics
Ping Li, Zhenzhen Liu, Yiyan Lu, Chenlong Lin, Wentao Ma
Summary: An experimental study was conducted on cylindrical steel fiber reinforced recycled aggregate concrete (SFRAC) specimens subjected to hydrostatic pressure and dynamic axial loading. The effects of confining stress, strain rate, volume fraction of steel fiber, and replacement ratio of recycled coarse aggregate were investigated. The results showed that an increase in confining pressure led to changes in failure modes, increased peak strength and ductility. Steel fibers had little influence on failure modes, but significantly improved ductility and toughness. The addition of recycled coarse aggregates reduced peak strength by nearly 20%.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Z. H. Wang, H. M. Wen, H. Zheng, J. S. Cheng
Summary: This study investigates the dynamic increase factors of concrete-like materials at ultra high strain rates through a combination of theoretical and experimental methods. It is found that the dynamic increase factor for concrete-like materials in compression due to strain rate effect only can be regarded as a constant at very high strain rates. In addition, the previously proposed semi-empirical equations accurately describe the strain rate sensitive behavior of concrete-like materials in both tension and compression.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Mujahid Ali, Sheraz Abbas, Afonso Rangel Garcez de Azevedo, Markssuel Teixeira Marvila, Muhammad Imran Khan, Waqas Rafiq
Summary: This article investigates the mechanical and durability properties of confined low-strength concrete using quantitative and analytical approaches. It analyzes the behavior of low strength concrete under axial compression and explores the impact of transverse reinforcement on the concrete's strength and ductility. The experimental results show that the spacing between the transverse steel significantly affects the concrete stresses and that an increase in volumetric transverse reinforcement improves the mechanical properties and relative ductility. The study also compares different analytical models and finds that Mander's model performs best prior to peak strength, while Kent and Park's models are more accurate for post-peak behavior.
Article
Engineering, Civil
Z. Kammouna, M. Briffaut, Y. Malecot
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2019)
Article
Architecture
E. Fritsch, Y. Sieffert, H. Algusab, S. Grange, P. Garnier, L. Daudeville
INTERNATIONAL JOURNAL OF ARCHITECTURAL HERITAGE
(2019)
Article
Construction & Building Technology
L. Missemer, E. Ouedraogo, Y. Malecot, C. Clergue, D. Rogat
CEMENT AND CONCRETE RESEARCH
(2019)
Article
Mechanics
Olga Stamati, Emmanuel Roubin, Edward Ando, Yann Malecot
Article
Chemistry, Multidisciplinary
Abdallah Accary, Yann Malecot, Laurent Daudeville
APPLIED SCIENCES-BASEL
(2019)
Article
Mathematics, Interdisciplinary Applications
Hicham Benniou, Abdallah Accary, Yann Malecot, Matthieu Briffaut, Laurent Daudeville
Summary: The discrete element model proposed in this paper addresses the macroscopic behavior of concrete while taking into account the presence of free water in pores. This new constitutive model considers the influence of saturation ratio on triaxial compressive stresses in concrete structures subjected to severe loading. By introducing a dependency between water saturation ratio and inelastic deformation due to pore closure, the model aims to model cracking and compaction at the interaction level between discrete elements.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Construction & Building Technology
Mohamed Saidi, Xuan Hong Vu, Emmanuel Ferrier
CEMENT & CONCRETE COMPOSITES
(2020)
Article
Engineering, Mechanical
J. Baroth, M. Briffaut, D. Vu, Y. Malecot, L. Daudeville
Summary: This paper presents analytical and finite element models for predicting perforation of reinforced concrete slabs under impacts. The finite element simulations and analytical predictions are consistent with experimental tests.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Chemistry, Physical
Alejandro Ortega Laborin, Emmanuel Roubin, Yann Malecot, Laurent Daudeville
Summary: This paper conducts an in-depth study on the theoretical basis of strong discontinuity methods for local fracture simulations using the Embedded Finite Element Method (E-FEM). A new proposal of strong discontinuity enhancement functions is presented, improving basic kinematic coherence and robustness of E-FEM techniques for fracture simulations. Simulation results demonstrate increased robustness and potential for higher level application of E-FEM techniques.
Article
Construction & Building Technology
A. Ortega, E. Roubin, Y. Malecot, L. Daudeville
Summary: This paper investigates the application of the Embedded Finite Element Method (E-FEM) in the numerical modeling of triaxial fracture processes in non-homogeneous quasi-brittle materials. The E-FEM framework combines weak and strong discontinuities to account for material heterogeneity and represent local fractures. The enriched fracture kinematics of the strong discontinuity allows modeling of all typical fracture modes in three dimensions. The paper reviews previous work using similar enriched finite element frameworks, establishes the theoretical basis of each discontinuity formulation, and presents numerical simulations to evaluate the performance of the combined E-FEM model.
MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Shadi Youssef, Abdallah Accary, Christophe Dano, Yann Malecot
Summary: This study investigates the mechanical behavior of siliceous and calcareous sand materials under high stress levels. The results show that particle breakage is enhanced by the presence of water, smaller particles in siliceous sand are more prone to breakage, and calcareous grains exhibit a faster response to axial stress. Testing various soil properties has the potential to better characterize soil fragility.
Article
Computer Science, Interdisciplinary Applications
A. Ortega, E. Roubin, Y. Malecot, L. Daudeville
Summary: This paper analyzes the application of the Embedded Finite Element Method (E-FEM) in simulating local material heterogeneities. It discusses the evolution of weak discontinuity models within the E-FEM framework and establishes a theoretical basis for enhancing weak discontinuities. The paper introduces two enhancement functions and evaluates their performance through numerical simulations.
COMPUTERS & STRUCTURES
(2022)
Article
Mathematics, Interdisciplinary Applications
Abdallah Accary, Hicham Benniou, Yann Malecot, Matthieu Briffaut, Laurent Daudeville
Summary: This paper investigates the influence of saturation ratio on perforation and penetration of concrete by simulating the impact of ogive-nosed steel projectile on plain concrete targets surrounded by steel jackets.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Construction & Building Technology
Santosh Yadav, Yannick Sieffert, Florent Vieux-Champagne, Laurent Debove, Damien Decret, Yann Malecot, Philippe Garnier
Summary: This paper explains the steps for the preparation and execution of shake table tests and showcases its advantages and applicability.