Publicacións

@article{bello_non-contact_2025,

title = {Non-contact strain measurement of loading-unloading splitting test on concrete},

author = {Ismail Bello and George Wardeh and Belén González-Fonteboa and Fernando Martínez-Abella},

url = {https://www.inderscienceonline.com/doi/abs/10.1504/IJMRI.2025.146257},

doi = {10.1504/IJMRI.2025.146257},

issn = {2056-9459},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {International Journal of Masonry Research and Innovation},

volume = {10},

number = {3-5},

pages = {458–472},

publisher = {Inderscience Publishers},

abstract = {The exact modelling of reinforced concrete structures necessitates a thorough control of post-cracking behaviour and the evolution of plastic deformations of concrete during loading-unloading cycles. Conducting a direct tensile test is more complex than the other tests, like the splitting test. This study investigates using the splitting test with digital image correlation (DIC) technique to analyse concrete deformation. By filming and processing images of splitting cylindrical specimens using GOM Correlate software, full stress-strain curves up to failure are obtained. Strain gauges are also employed for comparison. Results are validated against an analytical model, showing good agreement between stress-strain curves from both methods. The study concludes that DIC offers several advantages over conventional methods, including enhanced post-peak data acquisition and the ability to monitor cracks individually, regardless of their location on the surface. This approach improves the understanding of post-cracking behaviour and the evolution of plastic deformation in concrete structures.},

keywords = {analytical modelling, concrete, DIC, digital image correlation, splitting test, stress-strain analysis},

pubstate = {published},

tppubtype = {article}

}

@article{bello_complete_2024,

title = {Complete stress-strain analysis of masonry prisms under compressive loading-unloading cycles through digital image correlation},

author = {Ismail Bello and Fernando Martínez-Abella and George Wardeh and Belén González-Fonteboa},

url = {https://www.sciencedirect.com/science/article/pii/S0141029623015031},

doi = {10.1016/j.engstruct.2023.117088},

issn = {0141-0296},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Engineering Structures},

volume = {298},

pages = {117088},

abstract = {This paper presents the findings of an experimental study focused on the behaviour of masonry structures subjected to uniaxial loading-unloading compression. The study's primary objective is to examine the impact of joint mortar on the failure mode and the development of permanent strains using the digital image correlation technique (DIC). Masonry prisms were constructed using two types of fired bricks and five different mortars, each with varying cement and lime contents. The prisms were instrumented with a linear variable differential transformer (LVDT) for displacement measurements and prepared for image processing using DIC. The prisms were then subjected to compression testing until failure to capture their complete behaviour. The experimental results obtained through DIC and LVDT measurements showed good agreement. The DIC technique proved its effectiveness in providing comprehensive strain evaluations of the brick prisms, enabling a detailed stress-strain analysis at a full-scale level. Furthermore, the study revealed that prisms with lower cement content exhibited a more ductile behaviour in the post-peak region, with strain localisation observed at the joint mortar interface. To validate DIC's reliability in characterising masonry's cyclic behaviour, the results obtained from analytical modelling were compared with those derived from DIC. This comparison aimed to confirm the accuracy and consistency of DIC measurements. Overall, this study contributes to our understanding of masonry behaviour under compression and highlights the capabilities of DIC in capturing strain patterns and providing valuable insights into the influence of joint mortar on the structural response of masonry elements.},

keywords = {analytical modelling, Digital image correlation (DIC), Joint mortar, Masonry, Stress-strain relationship},

pubstate = {published},

tppubtype = {article}

}