Thermo-mechanical characterization and hysteretic behavior identification of innovative plastic joint for masonry infills in reinforced concrete buildings

Vailati, Marco; Gangi, Giorgia Di; Quaranta, Giuseppe

doi:10.1016/j.jobe.2022.105803

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…Usually, raw earth is adopted for non-structural components, coatings, or internal interventions [29][30][31] because of its low mechanical strength and low resistance to environmental conditions, such as rain, and variations in temperature and humidity. For load-bearing structures, fired earth elements, in the form of bricks and tiles, are diffusely organized in more complex assemblies able to resist dead and service loads [32,33]. However, this type of application possesses a high environmental footprint due to the energy consumption and emissions during the preparation process [34,35].…”

Section: Smart Shot-earth Concretementioning

confidence: 99%

Full-scale testing and multiphysics modeling of a reinforced shot-earth concrete vault with self-sensing properties

D’Alessandro,

Meoni,

Romero

et al. 2024

Meas. Sci. Technol.

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Civil constructions significantly contribute to greenhouse gas emissions and entail extensive energy and resource consumption, leading to a substantial ecological footprint. Research into eco-friendly engineering solutions is therefore currently imperative, particularly to mitigate the impact of concrete technology. Among potential alternatives, shot-earth-concrete, which combines cement and earth as a binder matrix and is applied via spraying, emerges as a promising option. Furthermore, this composite material allows for the incorporation of nano and micro-fillers, thereby providing room for enhancing mechanical properties and providing multifunctional capabilities. This paper investigates the damage detection capabilities of a novel smart shot-earth concrete with carbon microfibers, by investigating the strain sensing performance of a full-scale vault with a span of 4 meters, mechanically tested until failure. The material's strain and damage sensing capabilities involve its capacity to produce an electrical response (manifested as a relative change in resistance) corresponding to the applied strain in its uncracked state, as well as to exhibit a significant alteration in electrical resistance upon cracking. A detailed multiphysics numerical (i.e. mechanical and electrical) model is also developed to aid the interpretation of the experimental results. The experimental test was conducted by the application of an increasing vertical load at a quarter of the span, while modelling of the element was carried out by considering a piezoresistive material, with coupled mechanical and electrical constitutive properties, including a new law to reproduce the degradation of the electrical conductivity with tensile cracking. Another notable aspect of the simulation was the consideration of the effects of the electrical conduction through the rebars, which was found critical to accurately reproduce the full-scale electromechanical response of the vault. By correlating the outcomes from external displacement transducers with the self-monitoring features inherent in the proposed material, significant insights were gleaned. The findings indicated that the proposed smart-earth composite, besides being well suited for structural applications, also exhibits a distinctive electromechanical behaviour that enables the early detection of damage initiation. The results of the paper represent an important step toward the real application of smart earth-concrete in the construction field, demonstrating the effectiveness and feasibility of full-scale strain and damage monitoring even in the presence of steel reinforcement.

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Section: Smart Shot-earth Concretementioning

confidence: 99%

Full-scale testing and multiphysics modeling of a reinforced shot-earth concrete vault with self-sensing properties

D’Alessandro,

Meoni,

Romero

et al. 2024

Meas. Sci. Technol.

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“…In further studies the previous joint waw upgraded to be use in the retrofitting of doublelayer infills in which the mitigation of the pervasiveness is a priority requirement [12], also providing satisfactory results from a thermo-mechanical standpoint [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Model Calibration of a Low Impact Strengthening Technique Based on Bed-Joints Sliding in Seismic Retrofitting of Masonry Infills

Vailati,

Gregori,

Morelli

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The challenge against the waste of resources in the world of construction industry, starts from the seismic and thermal retrofitting of existing buildings with low environmental impact innovative technologies. When the buildings are especially vulnerable, for instance in the case of double-layer infills -often without thermal insulation -it's really hard to achieve satisfactory performance levels without resorting to radical interventions. In these cases the interaction with the building internal activities is unavoidable and forms a further design constraints. This work shows an innovative technology based on recycled plastic parts, optimized for the double-layer infills of existing buildings in which the maintaining of the internal activity is fundamental for the successful of the intervention. The system with recycled plastic joints is aiming at improving thermal and seismic performances, avoiding the residents relocation, consistently reducing the demolitions of existing infills and using plastic from recycled waste. Such system was preliminarily tested on a real-scale double-layer infill equipped with two joint lines under horizontal force at the testing laboratory of materials and structures (LPMS) of the University of L'Aquila. On the basis of this previous experimental tests, the present study proposes the calibration of a macroelement and a later numerical modelling of a multi-storey frame representative of r.c. buildings of the 80's. The results of the retrofitted configuration with plastic joints were compared with bare frame and infilled frame with different macroelement available for traditional infills.

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Experimental and numerical investigation of hysteretic earthquake behavior of masonry infilled RC frames with opening strengthened by adding rebar-reinforced stucco

Tekeli,

Yüksel,

Anıl

et al. 2024

Bull Earthquake Eng

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Adding a reinforced stucco layer to the masonry infill walls is a preferred method for strengthening RC frame system structures with an easy-to-apply method that does not require a long time, is economical, and does not require detailed and extensive workmanship. However, no research has been discovered as a result of the extensive literature review that investigates the effects of masonry-infilled RC frames strengthened with a reinforced stucco layer on the seismic performance of openings that must be due to architectural requirements such as doors, windows, installations, and similar ventilation systems. As a result, an experimental study was planned to investigate the effects of the dimensions and location of the opening in the masonry infill walls on the performance of the strengthening method with the reinforced stucco layer. The applied strengthening method increased the ultimate load capacity, initial stiffness, and energy dissipation capacity values of reinforced concrete frames with masonry infill walls by 83%, 226%, and 62%, respectively, but resulted in a 38% decrease in displacement-ductility ratios. The study found that the openings in the masonry infill walls harm the performance of the strengthening technique by adding a rebar-reinforced stucco layer and decreasing the success level. When the opening size increased, and the opening was located at the corner of the masonry wall, the performance of the applied strengthening technique was negatively affected and decreased. Furthermore, nonlinear numerical analyses of the experiments conducted as part of the study were performed using ABAQUS finite element software. The numerical analysis results were compared to the experimental results. It has been determined whether numerical analysis models are compatible with experimental results.

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Thermo-mechanical characterization and hysteretic behavior identification of innovative plastic joint for masonry infills in reinforced concrete buildings

Cited by 3 publications

References 44 publications

Full-scale testing and multiphysics modeling of a reinforced shot-earth concrete vault with self-sensing properties

Full-scale testing and multiphysics modeling of a reinforced shot-earth concrete vault with self-sensing properties

Numerical Model Calibration of a Low Impact Strengthening Technique Based on Bed-Joints Sliding in Seismic Retrofitting of Masonry Infills

Experimental and numerical investigation of hysteretic earthquake behavior of masonry infilled RC frames with opening strengthened by adding rebar-reinforced stucco

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