Impact

@article{Zanuy2019,
title = {Residual behavior of reinforced steel fiber‐reinforced concrete beams damaged by impact},
author = {Carlos Zanuy and Gonzalo S D Ulzurrun},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/suco.201800253},
doi = {10.1002/suco.201800253},
year = {2019},
date = {2019-01-01},
journal = {Structural Concrete},
volume = {20},
number = {2},
pages = {597-- 613},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@phdthesis{Sanz-DiezdeUlzurrunCasals2019,
title = {Capacidad resistente de elementos lineales de hormigón armado reforzado con fibras bajo cargas de impacto.},
author = {Gonzalo {Sanz-Diez de Ulzurrun Casals}},
doi = {10.20868/UPM.thesis.58074},
year = {2019},
date = {2019-01-01},
pages = {301},
school = {Universidad Politécnica de Madrid (UPM)},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}

@inproceedings{Zanuy2017c,
title = {Impact Performance of Low-Fiber Content HPFRCC: From Material to Structural Behavior},
author = {Carlos Zanuy and Gonzalo S D Ulzurrun},
url = {http://link.springer.com/10.1007/978-94-024-1194-2_55},
doi = {10.1007/978-94-024-1194-2_55},
year = {2017},
date = {2017-09-01},
booktitle = {International Conference on Strain-Hardening Cement-Based Composites},
pages = {473--481},
publisher = {Springer, Dordrecht},
address = {Dresden, Alemania},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}

@article{Ulzurrun2017,
title = {Enhancement of impact performance of reinforced concrete beams without stirrups by adding steel fibers},
author = {Gonzalo S D Ulzurrun and Carlos Zanuy},
url = {http://www.sciencedirect.com/science/article/pii/S0950061817306463},
doi = {10.1016/j.conbuildmat.2017.04.005},
issn = {09500618},
year = {2017},
date = {2017-08-01},
journal = {Construction and Building Materials},
volume = {145},
pages = {166--182},
publisher = {Elsevier},
abstract = {The impact strength of reinforced concrete beams without shear reinforcement is studied in this paper, with emphasis on the improvement of the impact performance achieved by using steel fiber-reinforced concrete (SFRC). Drop-weight and companion quasi-static tests have been completed on 2000 × 125 × 250 mm beams containing ordinary longitudinal steel bars. Seven SFRC mixes have been studied, including three fiber types (smooth, hooked and prismatic) and three volumetric fractions (0% i.e. plain concrete, 0.5% and 1.0%). The study has confirmed the brittle impact behavior of beams without fibers, which failed by shear. With the addition of 0.5% steel fibers, shear failures were obtained with hooked and prismatic fibers but not with smooth fibers. Finally, all beams with 1.0% steel fibers developed a flexural failure mode. The improvement of the impact behavior of beams with SFRC is also confirmed by the fact that most of the specimens which developed a flexural failure had thin diagonal cracks in the webs of the shear spans, but such cracks did not progress due to the fiber-bridging capacity. In the paper, the study is completed with an analysis of the rate sensitivity of the shear strength and the capacity for energy absorption of tested beams.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@inproceedings{Zanuy2017a,
title = {Rate Effects of Fiber-reinforced Concrete Specimens in Impact Regime},
author = {Carlos Zanuy and Gonzalo S D Ulzurrun},
url = {http://www.sciencedirect.com/science/article/pii/S1877705817328072},
doi = {10.1016/J.PROENG.2017.06.243},
issn = {1877-7058},
year = {2017},
date = {2017-06-01},
booktitle = {Proceedings of the International Conference on Analytical Models and New Concepts in Concrete and Masonry Structures},
volume = {193},
pages = {501--508},
publisher = {Elsevier},
address = {Gliwice, Polonia},
abstract = {A study of the rate sensitivity of prismatic specimens of steel fiber-reinforced concrete (FRC) is carried out in this contribution. Experimental results are analyzed from impact tests carried out with an instrumented drop weight testing machine. FRC mixes with two types of fibers have been studied, namely short straight fibers and long hook-ended fibers. The experiments have included two amounts of fibers (volumetric fractions of 0.5% and 1.0%), and also companion unreinforced plain concrete specimens are studied. The analysis has focused on the bending properties of the studied mixes, i.e. bending strength and absorbed energy. The study shows that each particular mix of FRC has different rate sensitivity because the dynamic behavior is a consequence of the rate dependence of the mechanisms governing the interaction between fibers and matrix. For the impact strain-rate domain achieved in the tests (1-10 s-1), it is shown that the study has to be done in terms of the energy absorption capacity of FRC. According to the results, the rate sensitivity decreases as the amount of fibers increases and, furthermore, the rate sensitivity of FRC mixes with hook-ended fibers is smaller than that of FRC mixes with straight fibers.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}

@article{Sanz-DiezdeUlzurrunCasals2017,
title = {Caracterización del comportamiento en flexión del hormigón reforzado con fibras sometido a impacto},
author = {Gonzalo {Sanz-Diez de Ulzurrun Casals} and Carlos {Zanuy Sánchez}},
url = {http://www.sciencedirect.com/science/article/pii/S0439568917300153},
doi = {10.1016/J.HYA.2017.04.003},
issn = {0439-5689},
year = {2017},
date = {2017-05-01},
journal = {Hormigón y Acero},
volume = {68},
number = {282},
pages = {139--145},
publisher = {Elsevier},
abstract = {El hormigón reforzado con fibras metálicas (SFRC por sus siglas en inglés) ha mostrado su eficacia mejorando las propiedades del hormigón. Una aplicación interesante de dicho material es en las estructuras sometidas a impactos. Con el objetivo de caracterizar las propiedades dinámicas del SFRC se ha llevado a cabo una campaña experimental con una máquina de impactos instalada recientemente en el Laboratorio de Estructuras de la Universidad Politécnica de Madrid. Las probetas ensayadas, reforzadas con distintos tipos de fibras metálicas en diferentes dosificaciones, muestran que las mezclas de SFRC presentan mejores propiedades dinámicas y una sensibilidad a la velocidad de carga diferente que el hormigón convencional. Steel-fibre-reinforced concrete (SFRC) has demonstrated its effectiveness in improving concrete properties. An interesting application of this material may be for structures subject to impact loads. An experimental camping was conducted in order to determine the dynamic properties of SFRC, with a drop weight testing machine recently installed in the UPM Structures Laboratory. The tested specimens, reinforced with different types of steel fibres and fibre content, showed that SFRC mixes have improved mechanical properties and a strain-rate sensitivity different than that of plain concrete.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Ulzurrun2017a,
title = {Flexural response of SFRC under impact loading},
author = {Gonzalo Ulzurrun and Carlos Zanuy},
url = {http://www.sciencedirect.com/science/article/pii/S0950061816320591?via%3Dihub},
doi = {10.1016/J.CONBUILDMAT.2016.12.138},
year = {2017},
date = {2017-03-01},
journal = {Construction and Building Materials},
volume = {134},
pages = {397--411},
publisher = {Elsevier},
abstract = {The research presented in this paper deals with the impact behavior of steel fiber-reinforced concrete (SFRC). An experimental campaign on unnotched prismatic specimens has been carried out, covering three types of steel fibers (smooth, hooked and prismatic), two volumetric contents (0.5 and 1%), and companion unreinforced plain concrete specimens. Impact tests have been performed with an instrumented drop weight testing machine recently installed at the Technical University of Madrid (UPM), Spain. According to experimental results, the peak strength and fracture energy of tested SFRC mixes are strain-rate dependent, showing dynamic increase factors (DIF) well larger than 1. On the one hand, the analysis has shown that the DIF of the peak bending strength of SFRC reinforced with smooth and prismatic fibers is higher than the DIF of the tensile strength of plain concrete and increases with the fiber content. SFRC reinforced with hooked fibers presented higher DIF with 0.5% fiber content than with 1.0%. The influence of rate-dependent size effect in the former results is discussed in the paper. On the other hand, the DIF of the fracture energy showed the highest rate sensitivity for plain concrete specimens and decreases with the addition of fibers due to the rate dependence of the mechanisms involved in the fiber-matrix interaction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zanuy2017b,
title = {Discussion of “Simplified Approach for Assessing Shear Resistance of Reinforced Concrete Beams under Impact Loads” (Paper by Wei-Jian Yi, De-Bo Zhao and Sashi K. Kunnath).},
author = {Carlos Zanuy and Gonzalo Ulzurrun},
url = {https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=51700775},
year = {2017},
date = {2017-01-01},
journal = {ACI Structural Journal},
volume = {114},
number = {3},
pages = {789--791},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@inproceedings{Zanuy2016a,
title = {Utilization of the capacity for energy absorption of concrete structures under impact},
author = {Carlos Zanuy and Gonzalo Ulzurrun and Iván M Díaz},
url = {http://www.scientific.net/KEM.711.806},
doi = {10.4028/www.scientific.net/KEM.711.806},
isbn = {978-3-03835-621-9},
year = {2016},
date = {2016-09-01},
booktitle = {The 8th International Conference on Concrete Under Severe Conditions-Environment & Loading},
volume = {711},
pages = {806--813},
publisher = {Trans Tech Publications},
address = {Lecco, Italia},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}

@inproceedings{Ulzurrun2016,
title = {Energy absorption of steel fiber-reinforced concrete beams under impact loads},
author = {Gonzalo Ulzurrun and Carlos Zanuy},
url = {https://www.researchgate.net/publication/316190974_Energy_absorption_of_steel_fiber-reinforced_concrete_beams_under_impact_loads},
year = {2016},
date = {2016-01-01},
booktitle = {The 11th fib International PhD Symposium in Civil Engineering},
pages = {745--752},
address = {Tokio, Japan},
abstract = {Concrete structures present brittle behavior against impulsive actions, like rock fall impacts, explo-sions or other causes. These actions release suddenly large amounts of energy. Fiber addition to con-crete enhances its energy absorption capacity, thereby increasing its performance against impact loads. In order to study influence of fiber addition in the behavior of concrete structures, an experi-mental campaign has been carried out on four concrete reinforced beams without stirrups. Conven-tional concrete and steel fiber-reinforced concrete (FRC) specimens were tested under impact and quasi-static conditions. Tests results suggested that under quasi-static conditions FRC beams were 40 % stronger than conventional concrete, showing a ductile behavior after shear crack development. Impact tests indicated that FRC beams are more capable to absorb impact energy without shattering. FRC energy absorption capacity under impact is almost a 300 % than that of concrete.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}

@inproceedings{Zanuy2014,
title = {Advantages and limitations of multi-degree-of-freedom models to simulate impact behavior of concrete structures},
author = {Carlos Zanuy and Servando García Flux{à} and Pablo {De La Fuente} and Iván M Díaz and Luis Albajar},
doi = {10.2749/222137814814027747},
year = {2014},
date = {2014-01-01},
booktitle = {37th IABSE Madrid Symposium},
volume = {102},
address = {Madrid},
abstract = {The present contribution deals with the behaviour of reinforced concrete beams under impact load. Moreover, the paper is intended as a discussion of advantages and limitations of different numerical models according to the degree of complexity. Two types of models are used. On the one hand, a simplified approach is presented, consisting of a three-degree-of-freedom model that reproduces the response of simply supported reinforced concrete beams subjected to an impact load at the midspan. The three degrees of freedom represent: 1) the contact between the beam and the projectile, 2) the flexural behaviour of the beam, and 3) the development of a critical shear crack. Nonlinear behaviour and damping are introduced into the three degrees of freedom. On the other hand, a comprehensive finite element model (Ansys LS-Dyna) has been used, which includes a concrete damage model with strain rate effect. It is discussed how the failure mode and the main physical behaviour are reproduced, comparing advantages and disadvantages regarding the reproduction of nonlinearities or strain rate effects, as well computational time required to perform parametric analyses.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}