Article
Mechanics
Yugui Cao, Longlong Li, Muyu Liu, Yufei Wu
Summary: The study found that under CFRP confinement, the compressive strength and ultimate strain of rubber concrete decrease with increasing rubber volume replacement ratio, while the stiffness of confinement also decreases with increasing rubber content.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Dong Xie, Zhongjun Hu, Boxin Wang, Kang Zhao, Yatao Shi
Summary: In this study, axial compressive tests were performed on BFRP-confined square reinforced concrete columns, showing that BFRP confinement leads to strength improvement and enhanced ductility. The difference in confinement level is mainly observed in the inelastic range, and increasing corner radius improves the uniformity of confinement pressure. A prediction equation is proposed to improve the accuracy of existing square section strength models.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Klajdi Toska, Flora Faleschini
Summary: This study analyzed the experimental behavior of confined concrete specimens subjected to axial cyclic load, revealing that the stress-strain curves obtained with cyclic loading coincide with the monotonic curve. The stress-strain curve of FRCM-confined concrete has been modeled according to three different behaviors exhibited in this experimental campaign, including purely softening, softening with plateau, and hardening.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Pengda Li, Tianqi Yang, Qiang Zeng, Feng Xing, Yingwu Zhou
Summary: The study demonstrated that replacing natural aggregates with recycled aggregates can enhance the CFRP-confinement effectiveness, leading to higher ultimate strength and strain enhancement in concrete. Additionally, the impact of the corner radius ratio on CFRP-confined SSRAC is more pronounced compared to CFRP confined natural aggregate concrete.
COMPOSITE STRUCTURES
(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
Mechanics
Molan Pan, Daiyu Wang, Weichang Pei, Zhenyu Wang
Summary: This study investigates the axial compressive behavior of a novel composite column, the fiber-reinforced plastic (FRP) tube confined concrete-encased cross-shaped steel columns (FCCSCs). A total of 36 specimens were tested under monotonic and cyclic axial compressive load. The results show that FCCSCs have excellent loadbearing capacity with a low steel content. A suitable gap between the FRP tube and the steel section can prevent premature failure of the FRP tube caused by steel buckling. A new confinement pressure model is proposed based on the test results. An axial load-bearing capacity model for FCCSCs is also developed.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Jun-Jie Zeng, JinJing Liao, Yu-Yi Ye, Yong-Chang Guo, Yu Zheng, Li-Hao Tan
Summary: The FRP spiral strip wrapping strengthening technique is effective in enhancing both strength and deformation capacity of reinforced concrete columns. The actual confinement effectiveness factor significantly influences the stress-strain curves of FRP spiral strip-confined concrete, while the level of confinement has limited influence on reducing the plastic strain. The existing axial stress-strain model for FRP fully confined concrete cylinders under cyclic compression underestimates the plastic strain and overestimates the envelop stress, and a revised model based on test results matches well with experimental data.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yanlei Wang, Pu Liu, Qi Cao, Guipeng Chen, Baolin Wan, Zitao Wei, Yu-Lei Bai
Summary: The study investigated the axial compressive behavior of rectangular concrete confined by FRP with different rupture strains, finding that the rupture strain of FRP significantly influenced the failure mode and deformation of the concrete; as the rupture strain of FRP increased, the strain reduction factors decreased due to more non-uniform dilation from larger rupture strain FRP. The axial stress vs. strain curves of the concrete confined by FRP could be categorized into three types based on the transition point and ultimate condition, including sufficient, moderate, and insufficient FRP confinement.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
Yu-Lei Bai, Yu-Feng Zhang, Jun-Feng Jia, Shi-Jie Mei, Qiang Han, Jian-Guo Dai
Summary: The paper presents a simplified plasticity damage model for LRS FRP-confined concrete under cyclic axial compression, which sacrifices some precision but provides accuracy in predicting the behavior of FRP-strengthened concrete.
COMPOSITE STRUCTURES
(2022)
Article
Construction & Building Technology
Ioanna Skyrianou, Eftychia I. Valiakou, Lampros N. Koutas, Christos G. Papakonstantinou
Summary: This study presents a comparative assessment of the compressive behaviour of rubberised concrete confined with FRP jackets. The results show that the compressive strength of concrete significantly decreases when crumb rubber is used as mineral aggregate replacement. The use of FRP confinement can mitigate this reduction, and both glass and carbon FRP jackets have similar confinement effectiveness.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yu-Lei Bai, Shi-Jie Mei, Pengda Li, Junjie Xu
Summary: LRS FRP-confined concrete enhances the ultimate strength, ductility, and energy absorption capacity of concrete structures. The confining pressure at large deformation significantly affects the damage process of concrete. By analyzing the cyclic response, plastic strain and stress degradation were identified as key parameters influencing the behavior of LRS FRP-confined concrete.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Civil
Yugui Cao, Yaofeng Liu, Xiaoqing Li, Yufei Wu
Summary: This study investigates the mechanical properties of FRP-confined rectangular rubber concrete columns and proposes corresponding models. The test results show that increasing aspect ratio and rubber volume replacement ratio lead to larger damage zone and lower compressive strength, while increasing the number of FRP layers results in larger damage zone and higher compressive strength.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Yanpeng Wang
Summary: The author and Li extended the stochastic damage model for concrete under monotonic and cyclic loadings to 3D stress states. A novel expression form of damage energy release rate, which is the damage driving force thermodynamically, was proposed, and some basic concepts related to concrete damage evolution were further demonstrated. Careful validation of the model against existing experiments showed that the model can capture the rate effect of concrete well and realistically simulate the monotonic strength, cyclic life, and their randomness for a wide range of stress states from uniaxial tension to confined compression.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Construction & Building Technology
Weiqiang Wang, M. Neaz Sheikh, Jun-Jie Zeng, Muhammad N. S. Hadi
Summary: This study investigates the compressive behavior of partially FRP confined concrete, focusing on its strain localization phenomenon. Experimental results show significant strain localization in partially confined concrete specimens with either strain-hardening or strain-softening responses. The proposed ultimate strain model outperforms other existing models and is the only one capturing the strain localization behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
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)
