Dynamic Analysis of Damaged Masonry Building Repaired with the Flexible Joint Method / Analiza Dynamiczna Uszkodzonego Murowanego Budynku Naprawionego Z Zastosowaniem Polimerowego Złacza Podatnego

Kwiecień, Arkadiusz; Kuboń, Piotr

doi:10.2478/v.10169-012-0003-2

Cited by 8 publications

(9 citation statements)

References 1 publication

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“…Larger loads at the cantilever end generate a greater bending moment, which increases the nonlinearity of the flexible polyurethane adhesive behaviour by increasing of shear strain of the polymer layer. Using data presented in [24], the shear strain calculated for the analysed polymer layers reached a value of 0.3, which places the obtained strain of 30% within the range of large deformations. By comparing the influence of this factor, it can be seen that the increase in deformation (caused by an increase in load) results in an increase in damping only for the highest tested adhesive thickness of 5 mm and for low frequencies.…”

Section: Discussion Of the Results Obtainedsupporting

confidence: 56%

Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

2020

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The aim of the present study is to consider the idea of using polyurethane flexible adhesive in to reduce the vibrations in structures exposed to dynamic loads and evaluate their damping properties in relation to large deformations. Firstly, two aluminium cantilever beams, simulating structural elements (without and with polyurethane layer in the form of tape), were analysed, in order to check the damping of the unconstrained polymer layer. In the second stage of the study, a composite beam consisting of two aluminium flat beams bonded with polymer adhesive was considered, so as to check the damping of the constrained polymer layer. Dynamic parameters, such as modes of free vibrations, corresponding natural frequencies and damping ratios, were determined and compared. The third stage of the investigation was aimed at solving the problem of the additional mass of the applied polymer layer, which influences the frequencies and damping of the tested structure. A special separating procedure is proposed that makes it possible to calculate the corrected real values of the polymer layer’s damping. The results of the study clearly show that the response of the composite aluminium beam with and without polymer adhesive layer is mainly influenced by the layers’ thickness and the large strain deformation, in terms of its damping characteristics. The use of polymer adhesive layers in constrained and unconstrained conditions leads to a significant reduction in the vibrations of tested beams, while preserving their stiffness at nearly the same level. The applied analysis procedure made it possible for us to separate the damping properties of the analysed polymer layers and evaluate them independently with respect to the influence of integrated structural elements on damping.

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Section: Discussion Of the Results Obtainedsupporting

confidence: 56%

Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

2020

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“…The second example of using the inertance function is presented on a masonry building damaged artificially by a hit of an excavator bucket and repaired by the polyurethane flexible joints [24] -Fig. 7.…”

Section: B Practical Application Of the Inertance Function -Diagnosis...mentioning

confidence: 99%

“…8), from which functions of the equivalent Rayleigh damping can be draw graphically (Fig. 9) and used in a numerical approach for model calculations [24]. Dynamic diagnosis of a small masonry building using the Damping was calculated also for higher eigen-frequencies of the analysed 3 stages of the building, visible in the compliance functions (Fig.…”

Section: B Practical Application Of the Inertance Function -Diagnosis...mentioning

confidence: 99%

Experimental dynamic damage assessment of PUFJ protected brick infilled RC building during successive shake table tests

Chełmecki,

Rakicevic,

Kwiecień

et al. 2023

Bulletin of the Polish Academy of Sciences Technical Sciences

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It is very important to determine eigen-values before and after certain extreme events that may cause damage accumulation such as earthquake, blasts, mining or seismic tests on research models. Unique experiment design and shake table testing was performed to investigate seismic performance of a 3D RC building model with infill walls and advanced protection with polyurethane-based joints and fiber polymer reinforced light and emergency jackets. For the purpose of a wider experimental activities three methods for determination of the dynamic characteristics were used during multiple successive shake table tests following a dynamic pushover approach and are presented in detail. They are Inertance function through impact hammer tests, standard Fourier transformation of measured acceleration time history and digital image correlation. The expected differences in the results are related to the type and intensity of excitation used, the involvement of materials with different mechanical and physical properties and with different rate and extend of damage accumulation, as well as local or global measurements. Yet, all methods lead to reliable results when a consistent methodology is being used, that takes into account locality or globality of measurements, leaving a choice for the most suitable depending on the site conditions. The presented inertance function method manifested its high efficiency in analysis of dynamic properties of large-scale structures and in monitoring of their changes caused by damage and repair process. It offers quite wide range of useful information, does not require very expensive equipment and its transportation cost is negligible. This method seems to be a proper diagnostic tool for simple experimental modal analysis of real structures and their structural elements, where detection of changes in structural condition and in dynamic properties is required, also as a non-destructive testing and monitoring method. The Digital image correlation proved to be a promising non-contact tool, strongly supporting the conventional instrumentation of shake table testing, while the Fourier transformation was used as a benchmark method yielding the most reliable results.

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“…The essence is the awareness that any interference in a material structure is intended to extend the time of safe operation of the building structure. This is why structural testing after the strengthening and repair stage plays such an important role [37]. When designing new structures and assessing the condition of structures that have been in use for several decades, it is important to meet technical regulations and the required level of safety [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Research on 18th-Century Building Structures in Terms of Static Scheme Changes

Mackiewicz,

Krentowski,

Zimiński

et al. 2023

Materials

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The evaluation of the technical condition of historic buildings that have operated for several hundred years is a complicated issue. Even buildings that are in very poor condition must be checked and assessed in terms of their further repair, strengthening, or compliance with conditions that allow the facility to be safely operated. Most 18th-century buildings have not survived to this day retaining their original arrangements and structural elements. Renovations and repair work in the past were often carried out using materials of uncertain quality, with repair work of different qualities and without detailed analysis or methodology, based only on the experience of the former builders. In historic structures, the character of the work of individual structural elements has often changed due to significant material degradation, the poor quality of repair work, or the loss of adequate support. When load transfers change, internal forces are redistributed, and, as a result, the static scheme changes. This article presents an overview of identified defects affecting the change in static schemes in historical building structures built in the 18th century, using the example of a historic building with a large number of aforementioned defects. The process of assessing the technical condition of the facility is presented, in which non-destructive testing (NDT) methods were used. Detailed computational analyses were carried out for the wooden roof truss structure, which had partially lost its support.

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Dynamic Analysis of Damaged Masonry Building Repaired with the Flexible Joint Method / Analiza Dynamiczna Uszkodzonego Murowanego Budynku Naprawionego Z Zastosowaniem Polimerowego Złacza Podatnego

Cited by 8 publications

References 1 publication

Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

Experimental dynamic damage assessment of PUFJ protected brick infilled RC building during successive shake table tests

Research on 18th-Century Building Structures in Terms of Static Scheme Changes

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