scholarly journals STRUCTURAL ANALYSIS OF WOOD BEAMS BY NON-DESTRUCTIVE METHODS IN RESTORATION WORKS OF THE CATHEDRAL OF MORELIA, MEXICO

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 263-270
Author(s):  
M. I. Carrillo Gómez ◽  
J. R. Sotomayor Castellanos ◽  
D. Raya González
Keyword(s):  
Structural Analysis ◽  
Wave Velocity ◽  
Dynamic Modulus ◽  
Density Wave ◽  
International Council ◽  
Wood Beams ◽  
Mechanical And Physical Properties ◽  
Wooden Structures ◽  
Non Destructive ◽  
Destructive Methods

<p><strong>Abstract.</strong> In the ceiling framework of the capitular hall of the Cathedral of Morelia, the overall state of the beams of the ceiling framework of the capitular hall of the Cathedral of Morelia was diagnosed as deplorable, for which a replacement was put underway for more recently sawed beams. The focus of this investigation was to determine the humidity content of the wood, its density, the wave velocity, the dynamic modulus and the quality factor of a sample of five new beams. These parameters were compared to the medium of five old beams. For the density, wave velocity, dynamic modulus and rigidness, there were no differences found between the old and new beams. The results suggest that the mechanical and physical properties of the new wood beams are equivalent to those of the older ones. Consequently, the strategy of substituting old and deteriorated wood beams for recently sawed ones was successful and complies with the requirements of the International Council of Monuments and Sites as referred to in the principles for the preservation of historical wooden structures.</p>

Verification of the Use of a Kučera Drill for Testing of Wood Properties

2021 ◽  
Vol 898 ◽  
pp. 107-112
Author(s):  
Pavel Černý ◽  
Romana Halamová ◽  
Věra Heřmánková
Keyword(s):  
Wood Quality ◽  
Wood Properties ◽  
Masonry Structures ◽  
Destructive Testing ◽  
Depth Of Penetration ◽  
Initial Experiment ◽  
Mortar Strength ◽  
Wooden Structures ◽  
Non Destructive ◽  
Destructive Methods

In common practice, we encounter cases where it is not possible to test the wood quality by destructive methods and it is, therefore, necessary to use non-destructive or semi-destructive methods, especially when the wood is already used in construction. The article deals with the methodology of non-destructive and semi-destructive testing of wooden structures using the methodology commonly used for the diagnosis of masonry structures, where mortar strength is tested using a so-called Kučera drill, and with verification of the applicability of this method in the testing of wood properties. Kučera drill was specially modified for the purpose of the experiment and its functionality was tested. The depth of penetration of the drill into the test specimen was tested. The article describes the principle of measurement and the design of the initial experiment, but also the pitfalls, which had to be faced.

Determination of the Dynamic Modulus of Elasticity and the Thickness of Concrete Structures by Non-Destructive Methods

2016 ◽  
Vol 691 ◽  
pp. 344-355
Author(s):  
Milan Pokorny ◽  
Norbert Jendzelovsky ◽  
Lenka Konecna
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Measuring Devices ◽  
Dynamic Modulus Of Elasticity ◽  
Non Destructive ◽  
Good Coincidence ◽  
Destructive Methods

This paper deals with the determination of selected parameters (the thickness and the dynamic modulus of elasticity) of concrete structures by non-destructive methods. Short overview of the literature, the description of used methods, measuring devices used during the tests, the descriptions of examined structures, and obtained results are mentioned. Two independent methods (the Ultrasonic Method and the Resonant Method, in some case with the combination of the Phase Velocity Method), had been used for determination of required parameters of structures. The results had been in good coincidence with the values mentioned in the literature. At the end of the paper, obtained results are summarized and future plans are presented.

scholarly journals ESTIMATING THE PROPERTIES OF A FINE AGGREGATE FIBRE REINFORCED CEMENTITIOUS COMPOSITE USING NON-DESTRUCTIVE METHODS

2018 ◽  
Vol 24 (8) ◽  
pp. 630-637
Author(s):  
Wiesława Głodkowska ◽  
Janusz Kobaka
Keyword(s):  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Fine Aggregate ◽  
Regression Equations ◽  
Cementitious Composite ◽  
Ultrasonic Wave Velocity ◽  
Steel Fibres ◽  
Reinforced Composite ◽  
Non Destructive ◽  
Destructive Methods

The paper proposes a method of estimating the properties of a fine aggregate steel fibre reinforced cementitious composite using non-destructive methods. Two methods were selected to identify the properties of such a composite. One of them uses electromagnetic induction in order to estimate the content of steel fibres dispersed in the composite space, while the other is based on the determination of ultrasonic wave velocity propagating through the composite. Having defined correlations between the properties of the fibre reinforced composite and non-destructive testing parameters, regression equations were determined. Seven relationships between properties of fibre reinforced composite as the dependent variables and two independent variables, i.e.: amperage and ultrasonic wave velocity, were established. Knowing the amperage and the ultrasonic wave velocity, the basic properties of the fibre reinforced composite can be determined from the regression equations in a non-destructive manner. In order to verify the equations, three plates with different amounts of steel fibres were made in field under natural conditions, and next subjected to non-destructive tests. The tests showed good compatibility between the experimental results and those of calculations, which indicates the correctness of the formulated equations.

Rust creep assessment—A comparison between a destructive method according to ISO 12944 and selected non-destructive methods

2021 ◽  
Vol 157 ◽  
pp. 106293
Author(s):  
Huichao Bi ◽  
Claus Erik Weinell ◽  
Raquel Agudo de Pablo ◽  
Benjamín Santos Varela ◽  
Sergio González Carro ◽  
...  
Keyword(s):  
Non Destructive ◽  
Destructive Methods

Study on Application of Stress Wave for Nondestructive Test of Wood Defects

2013 ◽  
Vol 401-403 ◽  
pp. 1119-1123 ◽  
Author(s):  
Wen Shu Lin ◽  
Jin Zhuo Wu
Keyword(s):  
Nondestructive Test ◽  
Stress Wave ◽  
Significant Influence ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Wood Products ◽  
Propagation Time ◽  
Propagation Parameters ◽  
Wave Technique ◽  
Wooden Structures

The elm wood samples were tested by the technique of stress wave, and the testing results were analyzed by using the statistic software of SPSS. The results showed that the moister content of wood, wood crack, the sizes of holes and numbers of holes have significant influence on propagation parameters and dynamic modulus of elasticity. Under the same specifications, the propagation time of the stress wave was longer in the wood with holes or cracks than the perfect wood samples, and the time become longer with the increasing the sizes and numbers of holes or cracks. The studying results of the thesis will provide a sound background for the application of stress-wave technique in detecting the inner defects of wood products and other wooden structures.

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