Article
Mechanics
S. S. Zhang, M. J. Jedrzejko, Y. Ke, T. Yu, X. F. Nie
Summary: The high efficiency of using the near-surface mounted (NSM) fiber-reinforced polymer (FRP) technique to improve the shear capacities of reinforced concrete (RC) beams has been proven by numerous studies. However, premature debonding failures such as interfacial debonding and concrete cover separation are often observed in RC beams strengthened with NSM FRP, which significantly limits the utilization of FRP strength. This paper proposes a novel FRP anchor for NSM FRP shear-strengthened beams and carries out a test program to investigate its effectiveness. The test results show that the proposed FRP anchor can mitigate or prevent debonding failures and significantly enhance the load-carrying and deformation capacities of RC beams strengthened with NSM FRP strips.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Ali Saribiyik, Bassel Abodan, Muhammed Talha Balci
Summary: This paper presents experimental and analytical studies on the shear strengthening of reinforced concrete (RC) beams using basalt fiber reinforced polymer (BFRP) composites. The results show that the shear capacity of RC beams strengthened with BFRP composites increased between 43% and 100%, with fully wrapped sheets and fully wrapped strips configurations proving to be the most effective. An appropriate prediction model has been determined for shear strengthening configurations.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Materials Science, Multidisciplinary
Jiahui Guo, Wenzhen Chen, Dandan Du, Wencong Zhang, Guorong Cui, Jianlei Yang
Summary: In this study, a 4.5 vol% TiBw/TAl5 composite with columnar network reinforced structure was prepared through presintering and subsequent hot extrusion. The influence of extrusion temperature on microstructure evolution and its correlation with strengthening was investigated. Results showed that the extrusion temperature played a decisive role in the evolution of the matrix morphology, with increasing temperature leading to the transformation of the microstructure into a lamellar structure. The matrix strength was positively correlated with the content of the lamellar alpha phase, while the strengthening of TiB whiskers displayed a weakening trend.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Li-Hua Shao, Xiaodong Qu, Tianyu Wang, Zheng Cui, Yuxuan Liu, Yong Zhu
Summary: Interfacial mechanics between elastoplastic fiber and elastic substrate/matrix are studied for various applications. Analytical models are derived for the fiber/substrate interface. The effect of plastic mechanical behavior of the fiber on interfacial stress transfer characteristics is studied for different cases. The research provides a guide for experiments with metal nanowires on a polymer substrate.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Mechanics
Aohan Zheng, Shan Li, Dengfeng Zhang, Yuhong Yan
Summary: The experimental investigation showed that the shear behavior of RC beams with corrosion-damaged stirrups can be significantly improved by strengthening with FRP grid-reinforced ECC matrix. The embedded FRP grid shares the shear force borne by the stirrups effectively, while the ECC enhances deformation characteristics and energy absorption. Additionally, a theoretical calculation formula based on the truss-arch model was proposed to predict the shear bearing capacity of the strengthened beams, which was confirmed to be safe and accurate.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Rabahi Abderezak, Hassaine Daouadji Tahar, Benferhat Rabia, Abdelouahed Tounsi
Summary: This research explores the application of composites in reinforcement and rehabilitation of structures, as well as their performance under thermomechanical loading effects. By using new techniques and analytical models, the study aims to improve understanding of the mechanical behavior of interfaces and provide insights for the design of related structures.
STRUCTURAL ENGINEERING AND MECHANICS
(2021)
Review
Construction & Building Technology
M. J. Jedrzejko, S. S. Zhang, Y. Ke, D. Fernando, X. F. Nie
Summary: This paper provides a comprehensive review and discussion of strength models for NSM FRP shear strengthened RC beams. The models are classified into three categories based on their approach and then summarized and discussed. This study aims to enhance understanding of existing strength models and provide a background for evaluating these models using a newly-generated experimental database.
ADVANCES IN STRUCTURAL ENGINEERING
(2023)
Review
Construction & Building Technology
Y. Ke, S. S. Zhang, M. J. Jedrzejko, D. Fernando, X. F. Nie
Summary: The application of near-surface mounted (NSM) fiber-reinforced polymer (FRP) for shear strengthening of RC beams has been extensively studied. Various strength models have been proposed to predict the contribution of NSM FRPs to the shear capacity of strengthened beams. This paper provides an objective assessment of 12 strength models collected from existing literature and analyzes the reasons for their inaccurate predictions.
ADVANCES IN STRUCTURAL ENGINEERING
(2023)
Article
Mechanics
Miao Su, Hui Peng, Ming Yuan, Shaofan Li
Summary: The study presents a machine learning-based artificial neural network approach to automatically identify the interfacial cohesive parameters between fiber-reinforced polymers and concrete. By utilizing a refined finite element model with a cohesive zone model and a trained ANN model, the cohesive law parameters can be accurately identified, showing high accuracy even for cases falling outside the training dataset gap.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Civil
Kang Wang, Yu-Hang Wang, Yuan Gao, Xu-Hong Zhou, Ji-Ke Tan, Hao Qi
Summary: This study proposes the use of prefabricated cold-formed steel strips to reinforce steel plate shear walls with door openings, improving their mechanical properties without inducing residual deformation and stress caused by conventional welding reinforcement methods. Test results show that the openings reduce the lateral stiffness and strength of the structures, while the proposed equivalent analysis model accurately predicts the weakening effect and has errors within 5% when compared to experimental results.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Yu Yuan, Gabriele Milani
Summary: This study proposes a new method to predict and simulate bond behavior in reinforced curved masonry structures. By using an analytical model and an interface cohesive law, this method accurately predicts bond strength with minimal parameters and calculation effort.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Zezhou He, Yinbo Zhu, Hengan Wu
Summary: This study explores the interaction between brick-interface systems through a multiscale analysis framework, revealing deformation modes and characteristics under different interface stacking configurations, and validates theoretical predictions through large-scale molecular dynamics simulations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
R. Kotynia, E. Oller, A. Mari, M. Kaszubska
Summary: This paper investigates the shear capacity of RC beams strengthened with EB FRP composites based on existing tests. The study aims to provide a comprehensive overview of different strengthening configurations and failure modes observed in experimental tests, as well as analyze the influence of various parameters on strengthening efficiency.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Ekkachai Yooprasertchai, Mawin Piamkulvanit, Chanathip Srithong, Teerathamrong Sukcharoen, Raktipong Sahamitmongkol
Summary: This study evaluated the cost and performance effectiveness of using CFRP, AFRP bars, and steel bolts as post-installed shear reinforcements for strengthening flat plate structures through a series of monotonic load tests. The results showed that specimens with post-installed shear reinforcements had increased shear capacity and more ductile behavior compared to the control specimen. Additionally, the experimental results were consistent with the critical shear crack theory, indicating that FRP materials are competitive with steel in terms of shear reinforcement.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Mechanics
Kai-Di Peng, Jun-Qi Huang, Bo-Tao Huang, Ling-Yu Xu, Jian-Guo Dai
Summary: This study presents a comprehensive investigation into the shear behavior of RC beams strengthened with a small-diameter FRP bar-reinforced geopolymer matrix (FRGM) system for the first time. A total of twelve RC beams were prepared and tested, considering five factors. The results showed that the double-side FRGM layer had a much larger strengthening efficiency than the single-side FRGM layer. The geopolymer-bonded layer showed a similar load capacity to its epoxy-bonded counterpart, and the addition of steel fibers in the geopolymer matrix improved shear capacity.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
P. Cornetti, M. Munoz-Reja, A. Sapora, A. Carpinteri
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2019)
Article
Mechanics
M. Munoz-Reja, P. Cornetti, L. Tavara, V Mantic
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Engineering, Mechanical
Alberto Sapora, Pietro Cornetti, Alberto Campagnolo, Giovanni Meneghetti
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Engineering, Mechanical
M. Munoz-Reja, L. Tavara, V Mantic, P. Cornetti
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Materials Science, Multidisciplinary
Aurelien Doitrand, Pietro Cornetti, Alberto Sapora, Rafael Estevez
Summary: Experimental and numerical investigations were conducted on mixed mode crack initiation in PMMA specimens containing square holes, revealing that crack deflection and failure load increase with decreasing hole sizes, corresponding to higher mode mixities. The Finite Fracture Mechanics approach successfully captured this behavior with good agreement between blind predictions and recorded data.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Mechanics
A. Sapora, G. Efremidis, P. Cornetti
Summary: Two nonlocal approaches, Gradient Elasticity and Finite Fracture Mechanics, are applied to analyze the behavior of a circular hole in an infinite elastic medium under remote biaxial loading and internal pressure. While GE is nonlocal in material behavior and local in failure criterion, FFM is local in material behavior and nonlocal in fracture criterion. Both approaches involve a characteristic length and can lead to almost identical critical load predictions when the internal lengths are properly related.
Article
Engineering, Mechanical
A. Chao Correas, M. Corrado, A. Sapora, P. Cornetti
Summary: This study investigates the decrease of apparent uniaxial tensile strength resulting from a single flawless spherical cavity in an infinite linear elastic continuum under uniaxial tension. A new generalized semianalytical expression for the stress intensity factor of an annular crack surrounding the spherical cavity is proposed and validated. The apparent tensile strength is estimated by four different approaches, showing good correlation with theoretical predictions, experimental data, and atomistic simulations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Chemistry, Physical
Amir Mohammad Mirzaei, Mauro Corrado, Alberto Sapora, Pietro Cornetti
Summary: This study investigates interfacial debonding in fiber-reinforced composites using different models and methods to analyze load values and maximum load values in direct shear tests, and proposes effective bond length formulas.
Article
Engineering, Mechanical
P. Cornetti, M. Munoz-Reja, V Mantic
Summary: In this paper, several analytical models describing the single-lap shear test are reviewed and compared. These models are one-dimensional and formulated under the assumption of pure mode II cracking process. The effective bond length estimates provided by different models are compared and compared with the ones present in Design Codes. Finally, a comparison with experimental data sets available in the Scientific Literature is also provided.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Francesco Ferrian, Pietro Cornetti, Liviu Marsavina, Alberto Sapora
Summary: Finite Fracture Mechanics and Cohesive Crack Model can predict the strength of structural components effectively, overcoming the limitations of Linear Elastic Fracture Mechanics. The present study aims to investigate size effects by expressing each model as a unified system of equations, describing stress requirement and energy balance. Two different structural configurations are considered for brittle crack onset, and the study is performed using a semi-analytical parametric approach. The theoretical strength predictions are validated with experimental results and estimations by the point criterion in the framework of Theory of Critical Distances.
FRATTURA ED INTEGRITA STRUTTURALE-FRACTURE AND STRUCTURAL INTEGRITY
(2022)
Article
Materials Science, Multidisciplinary
A. Chao Correas, P. Cornetti, M. Corrado, A. Sapora
Summary: The coupled criterion of Finite Fracture Mechanics (FFM) has been extended to dynamic loadings by introducing the Dynamic extension of FFM (DFFM) model. The DFFM model accurately predicts the rate dependence of failure initiation in brittle and quasi-brittle materials by considering the coalescence period of microcracks and the relationship between external solicitation, dynamic stress field, and energy release rate.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Engineering, Mechanical
Francesco Ferrian, Arturo Chao Correas, Pietro Cornetti, Alberto Sapora
Summary: This study investigates the failure size effect of a spheroidal void in an infinite linear elastic solid under remote tension using the coupled Finite Fracture Mechanics (FFM) approach. The opening stress field and stress intensity factor (SIF) of an annular crack are obtained numerically through finite element analyses (FEAs), and semi-analytical functions approximating the stress concentration factor and SIF are proposed. The failure size effect on spheroidal voids is reported and compared with experimental results, showing a good agreement with FFM predictions.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Alberto Sapora, Pietro Cornetti, Alberto Campagnolo, Giovanni Meneghetti
Summary: In this study, the coupled stress-energy criterion of Finite Fracture Mechanics (FFM) was applied to evaluate the fatigue limit of structures weakened by sharp V- and U-notches under mode I loading conditions. It was found that the FFM method requires consideration of material fatigue limits, stress intensity factor range thresholds, structural parameters, and notch geometry.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Proceedings Paper
Engineering, Civil
Alberto Sapora, Pietro Cornetti, Alberto Campagnolo, Giovanni Meneghetti
1ST VIRTUAL EUROPEAN CONFERENCE ON FRACTURE - VECF1
(2020)
Proceedings Paper
Construction & Building Technology
Alberto Sapora, Pietro Cornetti, Alberto Campagnolo, Giovanni Meneghetti
25TH INTERNATIONAL CONFERENCE ON FRACTURE AND STRUCTURAL INTEGRITY
(2019)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)