Investigations on the correlation-based determination of damping in engineering structures

2014 ◽  
pp. 507-512
Author(s):  
M Österreicher ◽  
A Strauss ◽  
K Bergmeister ◽  
D Prammer ◽  
T Zimmermann ◽  
...  
Keyword(s):  
Engineering Structures

scholarly journals Measuring Displacements in Engineering Structures by Means of a Coordinate Laser Station

2016 ◽  
Vol 23 (4) ◽  
pp. 145-160 ◽  
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Małgorzata Sztubecka
Keyword(s):  
Measurement Technique ◽  
Civil Engineering ◽  
Direct Drive ◽  
Engineering Structures ◽  
Total Station ◽  
3 Dimensional ◽  
Dimensional Measurements ◽  
Civil Engineering Structures ◽  
Definition Of

Abstract The application of geodetic methods to examine structures consists in the determination of their displacements relative to an established geodetic reference datum or in the definition of the geometry of their individual components. Such examinations form a picture of changes happening between specific points in time. Modern measurement technologies used in geodetic engineering enable undertaking more and more challenging measurements with increasing accuracy. The purpose of this article is to present a measurement technique involving a Leica TDRA 6000 total station to measure displacements in engineering structures. The station features a direct drive technology to achieve an accuracy of 0.25 mm in 3-dimensional measurements. Supported by appropriate software, the unit makes a perfect instrument for the monitoring of civil engineering structures. The article presents the results of measurement of static and dynamic displacements in a few engineering structures. The measurements were carried out both in laboratory conditions and on actual, operated civil engineering structures.

Determination of Dynamic Characteristics of Welded Joints Made of Steel S460NL

2014 ◽  
Vol 224 ◽  
pp. 267-275 ◽  
Author(s):  
Wiesław Barnat ◽  
Marek Kordys
Keyword(s):  
Plastic Deformation ◽  
Dynamic Characteristics ◽  
Welded Joints ◽  
High Speed ◽  
Steel Structures ◽  
Basic Material ◽  
Engineering Structures ◽  
Static Tests ◽  
Very High

Examination of the behavior of materials under very high speed plastic deformation are widely used during the designing process of dynamically loaded steel structures. Steel is widely used as a basic material for designing engineering structures. Characteristics of steel obtained under static experiments are different from those obtained during static tests.

Determination of Internal Forces Using Artificial Neural Networks

2017 ◽  
Vol 21 ◽  
pp. 151-157
Author(s):  
Alexandrina Elena Pandelea ◽  
Mihai Budescu ◽  
Lucian Soveja ◽  
Maria Solonaru
Keyword(s):  
Neural Networks ◽  
Finite Element ◽  
Artificial Neural Networks ◽  
Computer Program ◽  
Shear Force ◽  
Engineering Structures ◽  
Internal Forces ◽  
Artificial Neural ◽  
Construction Works

Design and verification of engineering structures require knowing the numerical values ​​of sectional internal forces as close to reality, considering that the intervention construction works are correlated with these values.Most of the computer programs are working with finite element method, which was designed by engineers and founded by mathematicians. After running the computer program, stresses and deformations maps are generated as results.Considering these results, using artificial neural networks, a computer program has been designed, which is able to determine internal forces of a section, namely axial force, shear force and bending moment.Neural network input parameters consist of color maps resulted from numerical modeling, numerical values ​​of the normal and tangential tensions and dimensions of the structural element.This procedure is particularly useful when using finite element programs that do not have the ability to determine sectional internal forces.

scholarly journals A Hybrid Method of Determining Deformations of Engineering Structures with a Laser Station and a 3D Scanner

2018 ◽  
Vol 28 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Karol Derejczyk ◽  
Michał Przytuła
Keyword(s):  
High Accuracy ◽  
Control Network ◽  
Structural Components ◽  
3D Scanner ◽  
Engineering Structures ◽  
Vertical Displacements ◽  
Measurement Methodology ◽  
Analysis Of Results ◽  
Deformation Measurements

Abstract The article presents the technology and an analysis of results of engineering structure displacements and deformation measurements. Two measuring technologies using the TDRA65000 laser station from Leica and the FARO Focus M scanner were applied during the tests. Use of the laser station enabled us to define horizontal and vertical displacements of a control network established on the tested facility. Owing to this, it was also possible to transform scanner measuring stations into one integrated unit. The described measurement methodology ensures a high accuracy of scanner station fitting which translates directly into the accuracy of determination of deformations in structural components of a facility. Integration of methods applied in the tests makes it possible to monitor not only displacements of control network points but also the structure as a whole in a uniform coordinate system.

scholarly journals Mechanical properties of lightweight concrete with sintered aggregate

2020 ◽  
Vol 323 ◽  
pp. 01005
Author(s):  
Anna M. Rogowska ◽  
Paweł M. Lewiński
Keyword(s):  
Tensile Strength ◽  
Power Plants ◽  
Lightweight Concrete ◽  
Building Structures ◽  
Engineering Structures ◽  
Concrete Shrinkage ◽  
Axial Tensile ◽  
Cylinder Strength ◽  
Complex Engineering

The objective of this paper is the determination of short-term properties of lightweight concrete with sintered aggregate. The aggregate material comes from the recycling of ashes from power plants, which yield granules after processing. The research was planned based on two concrete mixes. A series of tests was carried out in the ITB Laboratory of Building Structures, Geotechnics and Concrete. As a result of these tests, the following parameters were determined: secant modulus of elasticity and cylinder strength of concrete, cube strength of concrete, axial tensile strength, splitting tensile strength, flexural strength and concrete shrinkage. Knowledge of the tested parameters is necessary when designing prestressed structures, as well as accepting proven values for static calculations when designing complex engineering structures, including prestressed elements made of lightweight concrete.

scholarly journals Displacement and deformation study of engineering structures with the use of modern laser technologies

2020 ◽  
Vol 12 (1) ◽  
pp. 354-362
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Karol Derejczyk ◽  
Michał Przytuła
Keyword(s):  
Laser Scanning ◽  
Control Point ◽  
Point Clouds ◽  
Structural Components ◽  
Engineering Structures ◽  
Time Consumption ◽  
Laser Technologies ◽  
Analysis Of Results ◽  
Reduced Time

AbstractModern measuring technologies give the means to perform tasks previously impossible with conventional methods. Their main advantages include reduced time consumption and higher measurement precision. Contemporary displacement and deformation studies of engineering structures often involve application of laser technologies, which are characterised by high precision of measurements. This article presents an analysis of results obtained from measurements of changes in the geometry of an engineering structure in which two complementary measuring technologies were used, i.e. tachymetric measurement with a Leica TDRA6000 laser station and laser scanning with a 3D FARO Focus S150 scanner. The utilised laser station enabled determination of 3D displacements in the local control point network installed on the studied structure as well as transfer of point clouds obtained from laser scans into a uniform coordinate system. The hybrid technology employed and the measurement method used ensured that the accuracy of the determined displacements and deformations of the structural components of the structure was high. The described measurement and result processing technology makes it possible to comprehensively analyse the geometric performance of structures, which consequently leads to the development of more complete conclusions concerning prevention of adverse effects of displacements and deformations in engineering structures.

scholarly journals On a model of indentation for a functionally graded strip

2019 ◽  
Vol 485 (5) ◽  
pp. 564-567
Author(s):  
A. O. Vatulyan ◽  
D. K. Plotnikov
Keyword(s):  
Functionally Graded ◽  
Coating Process ◽  
New Materials ◽  
Indentation Method ◽  
Engineering Structures ◽  
Important Stage ◽  
Graded Coatings ◽  
Functionally Graded Coatings ◽  
Functionally Graded Strip

When different elements of engineering structures are manufactured, functionally graded coatings are applied to provide them with desired properties. The determination of the properties of the coatings after the coating process is an important stage in their development. Note that one of the most widely used techniques to identify the properties of new materials, including coatings, is the indentation method.

scholarly journals Vibration Monitoring of Civil Engineering Structures Using Contactless Vision-Based Low-Cost IATS Prototype

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7952
Author(s):  
Rinaldo Paar ◽  
Ante Marendić ◽  
Ivan Jakopec ◽  
Igor Grgac
Keyword(s):  
Natural Frequencies ◽  
Civil Engineering ◽  
Low Cost ◽  
Deformation Monitoring ◽  
Vibration Monitoring ◽  
Monitoring Systems ◽  
Load Testing ◽  
Engineering Structures ◽  
Civil Engineering Structures

The role and importance of geodesists in the planning and building of civil engineering constructions are well known. However, the importance and benefits of collected data during maintenance in exploitation have arisen in the last thirty years due primarily to the development of Global Positioning Systems (GPS) and Global Navigation Satellite System (GNSS) instruments, sensors and systems, which can receive signals from multiple GPS systems. In the last fifteen years, the development of Terrestrial Laser Scanners (TLS) and Image-Assisted Total Stations (IATS) has enabled much wider integration of these types of geodetic instruments with their sensors into monitoring systems for the displacement and deformation monitoring of structures, as well as for regular structure inspections. While GNSS sensors have certain limitations regarding their accuracy, their suitability in monitoring systems, and the need for a clean horizon, IATS do not have these limitations. The latest development of Total Stations (TS) called IATS is a theodolite that consists of a Robotic Total Station (RTS) with integrated image sensors. Today, IATS can be used for structural and geo-monitoring, i.e., for the determination of static and dynamic displacements and deformations, as well as for the determination of civil engineering structures’ natural frequencies. In this way, IATS can provide essential information about the current condition of structures. However, like all instruments and sensors, they have their advantages and disadvantages. IATS’s biggest advantage is their high level of accuracy and precision and the fact that they do not need to be set up on the structure, while their biggest disadvantage is that they are expensive. In this paper, the developed low-cost IATS prototype, which consists of an RTS Leica TPS1201 instrument and GoPro Hero5 camera, is presented. At first, the IATS prototype was tested in the laboratory where simulated dynamic displacements were determined. After the experiment, the IATS prototype was used in the field for the purpose of static and dynamic load testing of the railway bridge Kloštar, after its reconstruction according to HRN ISO NORM U.M1.046—Testing of bridges by load test. In this article, the determination of bridge dynamic displacements and results of the computation of natural frequencies using FFT from the measurement data obtained by means of IATS are presented. During the load testing of the bridge, the frequencies were also determined by accelerometers, and these data were used as a reference for the assessment of IATS accuracy and suitability for dynamic testing. From the conducted measurements, we successfully determined natural bridge frequencies as they match the results gained by accelerometers.

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