Effect of hemp bio composite strengthening on masonry barrel vaults damage

Gioffré, Massimiliano; Navarra, Giacomo; Cavalagli, Nicola; Iacono, F.; Gusella, Vittorio; Pepi, Chiara

doi:10.1016/j.conbuildmat.2022.130100

Cited by 14 publications

(2 citation statements)

References 39 publications

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“…This kind of methods have been used to identify structural systems [6][7][8], to perform structural health monitoring (SHM) [9][10][11][12][13], to calibrate finite elements models [14] and to detect structural damages [15,16]. OMA methods has been applied on historical buildings [7,17,18], tall buildings [19,20], bridges [21][22][23], masonry structures [24], dams [25], offshore platforms [26,27] and other structural systems [28][29][30][31]. Since the structural input is assumed as a white noise, OMA methods have a stochastic framework.…”

Section: Introductionmentioning

confidence: 99%

A new OMA method to perform structural dynamic identification: numerical and experimental investigation

Pirrotta

Russotto

2023

Acta Mech

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Operational modal analysis (OMA) methods are nowadays common in civil, mechanical and aerospace engineering to identify and monitor structural systems without any knowledge on the structural excitation provided that the latter is due to ambient vibrations. For this reason, OMA methods are embedded with stochastic concepts and then it is difficult for users that have no-knowledge in signal analysis and stochastic dynamics. In this paper an innovative method useful for structural health monitoring (SHM) is proposed. It is based on the signal filtering and on the Hilbert transform of the correlation function matrix. Specifically, the modal shapes are estimated from the correlation functions matrix of the filtered output process and then the frequencies and the damping ratios are estimated from the analytical signals of the mono-component correlation functions: a complex signals in which the real part represents the correlation function and the imaginary part is its Hilbert transform. This method is very simple to use since requires only few interactions with the users and thus it can be used also from users that are not experts in the aforementioned areas. In order to prove the reliability of the proposed method, numerical simulations and experimental tests are reported also considering comparisons with the most popular OMA methods.

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Section: Introductionmentioning

confidence: 99%

A new OMA method to perform structural dynamic identification: numerical and experimental investigation

Pirrotta

Russotto

2023

Acta Mech

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“…The natural fiber obtained from recycled plant resources has a hydrophilic nature, low cost, is environmentally friendly, and is biocompatible. These properties make it an ideal candidate for cement-based composites [2][3][4]. Moreover, the use of natural fibers reduces the carbon footprint in relation to cement composites reinforced with metal or plastic fibers [5,6].…”

Section: Introductionmentioning

confidence: 99%

An Approach to Understanding the Hydration of Cement-Based Composites Reinforced with Untreated Natural Fibers

Llorens,

Julián,

Gifra

et al. 2023

Sustainability

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The use of untreated natural fibers to reinforce cementitious composites improves their environmental friendliness, resulting in a more sustainable material. Moreover, the influence of the untreated natural fibers on the hydration process of Portland cement composites presents some uncertainties. According to the literature, the most usual tests to analyze the degree of hydration of cement composites are the differential thermal and thermogravimetric analyses (TGA/dTGA). Several authors propose to analyze data methods to establish the degree of hydration of cement composites. This paper presents the TGA/dTGA test carried out on mortar samples with and without fibers at age 2, 3, 7, 14, and 28 days. The degree of hydration was calculated according to Bhatty’s method. To characterize the raw materials, the quantitative chemical was determined using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM–EDX). The main findings of this study were that the presence of untreated natural hemp fibers in the OPC composites increased the hydration degree by 9%. The presence of fibers affected the formation of several components. Thus, their presence increased the formation of monosulphate, reduced portlandite, did not affect ettringite, and increased the formation of calcite, thereby improving the sustainable footprint due to the increased CO2 fixation.

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Hybridization and its transformative role in bamboo fiber reinforced polymer composites: a review

Khan,

Sapuan,

Zainudin

et al. 2024

Adv Compos Hybrid Mater

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Effect of hemp bio composite strengthening on masonry barrel vaults damage

Cited by 14 publications

References 39 publications

A new OMA method to perform structural dynamic identification: numerical and experimental investigation

A new OMA method to perform structural dynamic identification: numerical and experimental investigation

An Approach to Understanding the Hydration of Cement-Based Composites Reinforced with Untreated Natural Fibers

Hybridization and its transformative role in bamboo fiber reinforced polymer composites: a review

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