TY  - CONF
AU  - Mijatović, Ognjen
AU  - Mišković, Zoran
AU  - Salatić, Ratko
AU  - Golubović - Bugarski, Valentina
AU  - Guzijan - Dilber, Matija
PY  - 2024
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3470
AB  - Driven by the industry's needs to address energy dissipation issues in mechanical connections,
the set goals of the global scientific community, and previous research efforts to interpret how
the condition of contact surfaces between two bodies in contact can be significant, a unique
experimental setup has been devised to study the impact of the state of contact interaction
between two bodies on the system's response. The purpose of the designed experimental setup
is to correlate the roughness of contact surfaces with the deformation of a specially designed
experimental sample. The roughness of contact surfaces represents the most dominant
influencing factor in the contact interaction of two bodies. In terms of scale, the study,
measurement, and analysis of surface roughness fall under the micro and nano scales. On the
other hand, the change in deformation of the experimental sample as a result of the change in
roughness falls under the macro scale. Based on all the aforementioned, the fundamental idea of
the designed experimental setup can be seen. Considering that it is not possible to enter into
contact interaction and explicitly analyse the influence of roughness on the response of a
mechanical connection, the idea in overall research is to consider the macro behaviour of a
specially prepared experimental sample depending on the level of roughness of the contact
interaction surfaces at the micro level. The aim of this paper is to present details and challenges
in the construction of an instrument necessary for such precise examinations, named “Precision
Press with Arcs”.
PB  - University of Montenegro Faculty of Civil Engineering
C3  - The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024
T1  - Development of a tool for measuring the effect of surface roughness on steel structural response
EP  - 256
SP  - 249
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3470
ER  - 

@conference{
author = "Mijatović, Ognjen and Mišković, Zoran and Salatić, Ratko and Golubović - Bugarski, Valentina and Guzijan - Dilber, Matija",
year = "2024",
abstract = "Driven by the industry's needs to address energy dissipation issues in mechanical connections,
the set goals of the global scientific community, and previous research efforts to interpret how
the condition of contact surfaces between two bodies in contact can be significant, a unique
experimental setup has been devised to study the impact of the state of contact interaction
between two bodies on the system's response. The purpose of the designed experimental setup
is to correlate the roughness of contact surfaces with the deformation of a specially designed
experimental sample. The roughness of contact surfaces represents the most dominant
influencing factor in the contact interaction of two bodies. In terms of scale, the study,
measurement, and analysis of surface roughness fall under the micro and nano scales. On the
other hand, the change in deformation of the experimental sample as a result of the change in
roughness falls under the macro scale. Based on all the aforementioned, the fundamental idea of
the designed experimental setup can be seen. Considering that it is not possible to enter into
contact interaction and explicitly analyse the influence of roughness on the response of a
mechanical connection, the idea in overall research is to consider the macro behaviour of a
specially prepared experimental sample depending on the level of roughness of the contact
interaction surfaces at the micro level. The aim of this paper is to present details and challenges
in the construction of an instrument necessary for such precise examinations, named “Precision
Press with Arcs”.",
publisher = "University of Montenegro Faculty of Civil Engineering",
journal = "The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024",
title = "Development of a tool for measuring the effect of surface roughness on steel structural response",
pages = "256-249",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3470"
}

Mijatović, O., Mišković, Z., Salatić, R., Golubović - Bugarski, V.,& Guzijan - Dilber, M.. (2024). Development of a tool for measuring the effect of surface roughness on steel structural response. in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024
University of Montenegro Faculty of Civil Engineering., 249-256.
https://hdl.handle.net/21.15107/rcub_grafar_3470

Mijatović O, Mišković Z, Salatić R, Golubović - Bugarski V, Guzijan - Dilber M. Development of a tool for measuring the effect of surface roughness on steel structural response. in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024. 2024;:249-256.
https://hdl.handle.net/21.15107/rcub_grafar_3470 .

Mijatović, Ognjen, Mišković, Zoran, Salatić, Ratko, Golubović - Bugarski, Valentina, Guzijan - Dilber, Matija, "Development of a tool for measuring the effect of surface roughness on steel structural response" in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024 (2024):249-256,
https://hdl.handle.net/21.15107/rcub_grafar_3470 .

TY  - JOUR
AU  - Mijatović, Ognjen
AU  - Borković, Александар
AU  - Guzijan-Dilber, Matija
AU  - Mišković, Zoran
AU  - Salatić, Ratko
AU  - Mandić, Rastislav
AU  - Golubović-Bugarski, Valentina
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3165
AB  - The objective of this research is to develop a numerical model of one widely used bolted beam splice connection
that dissipates energy through structural damping. The reference experimental setup is carefully designed to
obtain the highly nonlinear dynamic response due to the suddenly released load. The fact that the monolithic
beam with welded connection has a linear response is utilized for the initial calibration of the numerical and
experimental models. Then, the numerical model of bolted beam splice connection is verified and adopted
through an iterative process. The influences of time and spatial integration, bolt load application, element
type, contact formulation, bulk viscosity, and mass scaling are discussed. A special attention is given to the
load application and load release functions. After the verification, the Abaqus/Explicit numerical model is
validated through the comparison with experimental data, where an appropriate friction coefficient is adopted.
It is demonstrated that the nonlinear structural damping occurs due to the complex micro slip behavior at the
contact interface.
T2  - Thin-Walled Structures
T1  - Experimental and numerical study of structural damping in a beam with bolted splice connection
VL  - 186
DO  - 10.1016/j.tws.2023.110661
ER  - 

@article{
author = "Mijatović, Ognjen and Borković, Александар and Guzijan-Dilber, Matija and Mišković, Zoran and Salatić, Ratko and Mandić, Rastislav and Golubović-Bugarski, Valentina",
year = "2023",
abstract = "The objective of this research is to develop a numerical model of one widely used bolted beam splice connection
that dissipates energy through structural damping. The reference experimental setup is carefully designed to
obtain the highly nonlinear dynamic response due to the suddenly released load. The fact that the monolithic
beam with welded connection has a linear response is utilized for the initial calibration of the numerical and
experimental models. Then, the numerical model of bolted beam splice connection is verified and adopted
through an iterative process. The influences of time and spatial integration, bolt load application, element
type, contact formulation, bulk viscosity, and mass scaling are discussed. A special attention is given to the
load application and load release functions. After the verification, the Abaqus/Explicit numerical model is
validated through the comparison with experimental data, where an appropriate friction coefficient is adopted.
It is demonstrated that the nonlinear structural damping occurs due to the complex micro slip behavior at the
contact interface.",
journal = "Thin-Walled Structures",
title = "Experimental and numerical study of structural damping in a beam with bolted splice connection",
volume = "186",
doi = "10.1016/j.tws.2023.110661"
}

Mijatović, O., Borković, А., Guzijan-Dilber, M., Mišković, Z., Salatić, R., Mandić, R.,& Golubović-Bugarski, V.. (2023). Experimental and numerical study of structural damping in a beam with bolted splice connection. in Thin-Walled Structures, 186.
https://doi.org/10.1016/j.tws.2023.110661

Mijatović O, Borković А, Guzijan-Dilber M, Mišković Z, Salatić R, Mandić R, Golubović-Bugarski V. Experimental and numerical study of structural damping in a beam with bolted splice connection. in Thin-Walled Structures. 2023;186.
doi:10.1016/j.tws.2023.110661 .

Mijatović, Ognjen, Borković, Александар, Guzijan-Dilber, Matija, Mišković, Zoran, Salatić, Ratko, Mandić, Rastislav, Golubović-Bugarski, Valentina, "Experimental and numerical study of structural damping in a beam with bolted splice connection" in Thin-Walled Structures, 186 (2023),
https://doi.org/10.1016/j.tws.2023.110661 . .

TY  - CONF
AU  - Guzjan-Dilber, Matija
AU  - Mijatović, Ognjen
AU  - Mandić, Rastislav
AU  - Salatić, Ratko
AU  - Mišković, Zoran
AU  - Golubović-Bugarski, Valentina
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2387
AB  - Problems involving contact are of great importance in industry related to
mechanical and civil engineering, but also in biomechanics and other applications. The
contact interaction between surfaces in a bolted splice connection joint or area through
which tire interacts with the road is not known a priori, leading to a nonlinear boundary
value problem. Due to the rapid improvement of modern computer technology, today one
can apply the tools of computational mechanics to analyze contact problems with limited
accuracy, depending on design requirements. However, even now most of the standard
finite element software is not fully capable of solving contact problems, including friction,
using robust algorithms. The aim of this paper is to present some basic concepts of Contact
Mechanics. To illustrate the difficulties arising in computational contact mechanics,
Newton-Raphson scheme was used to solve simple 1D contact problem using penalty
method.
C3  - Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE
T1  - Penalty method for 1d problem of two rods with basic concepts of contact mechanics of frictionless contact
VL  - 319-328
DO  - 10.14415/konferencijaGFS2021.30
ER  - 

@conference{
author = "Guzjan-Dilber, Matija and Mijatović, Ognjen and Mandić, Rastislav and Salatić, Ratko and Mišković, Zoran and Golubović-Bugarski, Valentina",
year = "2021",
abstract = "Problems involving contact are of great importance in industry related to
mechanical and civil engineering, but also in biomechanics and other applications. The
contact interaction between surfaces in a bolted splice connection joint or area through
which tire interacts with the road is not known a priori, leading to a nonlinear boundary
value problem. Due to the rapid improvement of modern computer technology, today one
can apply the tools of computational mechanics to analyze contact problems with limited
accuracy, depending on design requirements. However, even now most of the standard
finite element software is not fully capable of solving contact problems, including friction,
using robust algorithms. The aim of this paper is to present some basic concepts of Contact
Mechanics. To illustrate the difficulties arising in computational contact mechanics,
Newton-Raphson scheme was used to solve simple 1D contact problem using penalty
method.",
journal = "Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE",
title = "Penalty method for 1d problem of two rods with basic concepts of contact mechanics of frictionless contact",
volume = "319-328",
doi = "10.14415/konferencijaGFS2021.30"
}

Guzjan-Dilber, M., Mijatović, O., Mandić, R., Salatić, R., Mišković, Z.,& Golubović-Bugarski, V.. (2021). Penalty method for 1d problem of two rods with basic concepts of contact mechanics of frictionless contact. in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE, 319-328.
https://doi.org/10.14415/konferencijaGFS2021.30

Guzjan-Dilber M, Mijatović O, Mandić R, Salatić R, Mišković Z, Golubović-Bugarski V. Penalty method for 1d problem of two rods with basic concepts of contact mechanics of frictionless contact. in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE. 2021;319-328.
doi:10.14415/konferencijaGFS2021.30 .

Guzjan-Dilber, Matija, Mijatović, Ognjen, Mandić, Rastislav, Salatić, Ratko, Mišković, Zoran, Golubović-Bugarski, Valentina, "Penalty method for 1d problem of two rods with basic concepts of contact mechanics of frictionless contact" in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE, 319-328 (2021),
https://doi.org/10.14415/konferencijaGFS2021.30 . .

TY  - CONF
AU  - Mijatović, Ognjen
AU  - Salatić, Ratko
AU  - Mišković, Zoran
AU  - Golubović-Bugarski, Valentina
AU  - Guzjan-Dilber, Matija
AU  - Ljujić, Nenad
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2386
AB  - This paper presents the finite element modeling of bolted joints for structural
dynamic analysis to achieve a reasonable accuracy in simulation results. Non-linear
effects in splice connected joints involve normal compressive loads holding components
together combined with dynamic lateral loads inducing some amount of shear slip in
contact interaction between elements of splice connection joint. The complexities of the
slip process are responsible for the nonlinear nature of the interfaces, both in terms of
stiffness and dissipation. Exploring the physics of joints directly is not readily done
because key interactions takes place at the interface of surfaces, where instrumentation
cannot be placed without changing the problem. Consequences of the specific conditions
of joint connections are increased dynamic problems related to vibrations and dissipative
processes in structure connection joints. Structural joints are the main reason for the
significant level of energy dissipation and source of structural damping. The aim of this
paper is to present some problems regarding research of structural damping and the
importance of study Contact Mechanics to better understand the problem of structural
damping.
C3  - Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE
T1  - Numerical and experimental analysis of structural damping for bolted splice connection joint
VL  - 297-307
DO  - 10.14415/konferencijaGFS2021.28
ER  - 

@conference{
author = "Mijatović, Ognjen and Salatić, Ratko and Mišković, Zoran and Golubović-Bugarski, Valentina and Guzjan-Dilber, Matija and Ljujić, Nenad",
year = "2021",
abstract = "This paper presents the finite element modeling of bolted joints for structural
dynamic analysis to achieve a reasonable accuracy in simulation results. Non-linear
effects in splice connected joints involve normal compressive loads holding components
together combined with dynamic lateral loads inducing some amount of shear slip in
contact interaction between elements of splice connection joint. The complexities of the
slip process are responsible for the nonlinear nature of the interfaces, both in terms of
stiffness and dissipation. Exploring the physics of joints directly is not readily done
because key interactions takes place at the interface of surfaces, where instrumentation
cannot be placed without changing the problem. Consequences of the specific conditions
of joint connections are increased dynamic problems related to vibrations and dissipative
processes in structure connection joints. Structural joints are the main reason for the
significant level of energy dissipation and source of structural damping. The aim of this
paper is to present some problems regarding research of structural damping and the
importance of study Contact Mechanics to better understand the problem of structural
damping.",
journal = "Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE",
title = "Numerical and experimental analysis of structural damping for bolted splice connection joint",
volume = "297-307",
doi = "10.14415/konferencijaGFS2021.28"
}

Mijatović, O., Salatić, R., Mišković, Z., Golubović-Bugarski, V., Guzjan-Dilber, M.,& Ljujić, N.. (2021). Numerical and experimental analysis of structural damping for bolted splice connection joint. in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE, 297-307.
https://doi.org/10.14415/konferencijaGFS2021.28

Mijatović O, Salatić R, Mišković Z, Golubović-Bugarski V, Guzjan-Dilber M, Ljujić N. Numerical and experimental analysis of structural damping for bolted splice connection joint. in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE. 2021;297-307.
doi:10.14415/konferencijaGFS2021.28 .

Mijatović, Ognjen, Salatić, Ratko, Mišković, Zoran, Golubović-Bugarski, Valentina, Guzjan-Dilber, Matija, Ljujić, Nenad, "Numerical and experimental analysis of structural damping for bolted splice connection joint" in Contemporary achievements in civil engineering 22-23. April 2021. Subotica, SERBIA,8th INTERNATIONAL CONFERENCE, 297-307 (2021),
https://doi.org/10.14415/konferencijaGFS2021.28 . .

TY  - CONF
AU  - Mijatović, Ognjen
AU  - Mišković, Zoran
AU  - Salatić, Ratko
AU  - Rastislav, Mandić
AU  - Golubović-Bugarski, Valentina
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2250
AB  - The aim of this paper is to discuss numerical analysis and verification of experimentally tested bolted and weld splice connections in the commercial Abaqus software. The first step in verifying a numerical model with an experimental one is to compare the modal frequencies. The problems that arise when modeling multiple bodies in a contact interaction, such as in the case of bolted splice connection joint, arise from the behavior of the contact itself [2] and [1]. In order for the numerical model to be stable and without calculations convergence issue, it is necessary to: define an adequate type and size of finite elements, determine the master and slave surfaces, and properly define the constraints and connections of the separate parts of the bolted welded connection structure. Tests with a modal hammer were performed in order to find the oscillation tones of the cantilever beam under consideration, which would be compared with the numerical model. Based on a comparison of numerical and experimental results, it is discussed whether the experimental beam is adequately designed and constructed and the effects of the support and splice connections on the frequencies are considered.
C3  - THE 7th INTERNATIONAL CONFERENCE "CIVIL ENGINEERING - SCIENCE AND PRACTICE" GNP 2020 – Kolašin, Montenegro
T1  - A numerical verification of IPE-80 steel cantilever beam with bolted and welded splice connection joint
EP  - 148
SP  - 141
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2250
ER  - 

@conference{
author = "Mijatović, Ognjen and Mišković, Zoran and Salatić, Ratko and Rastislav, Mandić and Golubović-Bugarski, Valentina",
year = "2020",
abstract = "The aim of this paper is to discuss numerical analysis and verification of experimentally tested bolted and weld splice connections in the commercial Abaqus software. The first step in verifying a numerical model with an experimental one is to compare the modal frequencies. The problems that arise when modeling multiple bodies in a contact interaction, such as in the case of bolted splice connection joint, arise from the behavior of the contact itself [2] and [1]. In order for the numerical model to be stable and without calculations convergence issue, it is necessary to: define an adequate type and size of finite elements, determine the master and slave surfaces, and properly define the constraints and connections of the separate parts of the bolted welded connection structure. Tests with a modal hammer were performed in order to find the oscillation tones of the cantilever beam under consideration, which would be compared with the numerical model. Based on a comparison of numerical and experimental results, it is discussed whether the experimental beam is adequately designed and constructed and the effects of the support and splice connections on the frequencies are considered.",
journal = "THE 7th INTERNATIONAL CONFERENCE "CIVIL ENGINEERING - SCIENCE AND PRACTICE" GNP 2020 – Kolašin, Montenegro",
title = "A numerical verification of IPE-80 steel cantilever beam with bolted and welded splice connection joint",
pages = "148-141",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2250"
}

Mijatović, O., Mišković, Z., Salatić, R., Rastislav, M.,& Golubović-Bugarski, V.. (2020). A numerical verification of IPE-80 steel cantilever beam with bolted and welded splice connection joint. in THE 7th INTERNATIONAL CONFERENCE "CIVIL ENGINEERING - SCIENCE AND PRACTICE" GNP 2020 – Kolašin, Montenegro, 141-148.
https://hdl.handle.net/21.15107/rcub_grafar_2250

Mijatović O, Mišković Z, Salatić R, Rastislav M, Golubović-Bugarski V. A numerical verification of IPE-80 steel cantilever beam with bolted and welded splice connection joint. in THE 7th INTERNATIONAL CONFERENCE "CIVIL ENGINEERING - SCIENCE AND PRACTICE" GNP 2020 – Kolašin, Montenegro. 2020;:141-148.
https://hdl.handle.net/21.15107/rcub_grafar_2250 .

Mijatović, Ognjen, Mišković, Zoran, Salatić, Ratko, Rastislav, Mandić, Golubović-Bugarski, Valentina, "A numerical verification of IPE-80 steel cantilever beam with bolted and welded splice connection joint" in THE 7th INTERNATIONAL CONFERENCE "CIVIL ENGINEERING - SCIENCE AND PRACTICE" GNP 2020 – Kolašin, Montenegro (2020):141-148,
https://hdl.handle.net/21.15107/rcub_grafar_2250 .

TY  - CONF
AU  - Mijatović, Ognjen
AU  - Mišković, Zoran
AU  - Salatić, Ratko
AU  - Mandić, Rastislav
AU  - Golubović-Bugarski, Valentina
AU  - Relja, Gabriel
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2247
AB  - Progress and demands of all types of constructions imposed the need for the development of modern structures that are lightweight, but at the same time have high damping capacity and stiffness. The consequences of these requirements are increased dynamic problems related to vibrations and dissipative processes in structure connection joints. Structural joints are the main reason for the significant reduction of the level of energy dissipation and source of structural damping so therefore they have become a subject of interest to many researchers. The aim of this paper is to present some problems regarding research of structural damping and the importance of study Contact Mechanics to better understand the problem of structural damping.
PB  - University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy
C3  - International conference on Contemporary Theory and Practice in Construction XIV
T1  - Experimental analysis of structural damping for bolted and welded splice connection join for IPE-80 steel profile
VL  - 32-42
DO  - 10.7251/STP2014032M
ER  - 

@conference{
author = "Mijatović, Ognjen and Mišković, Zoran and Salatić, Ratko and Mandić, Rastislav and Golubović-Bugarski, Valentina and Relja, Gabriel",
year = "2020",
abstract = "Progress and demands of all types of constructions imposed the need for the development of modern structures that are lightweight, but at the same time have high damping capacity and stiffness. The consequences of these requirements are increased dynamic problems related to vibrations and dissipative processes in structure connection joints. Structural joints are the main reason for the significant reduction of the level of energy dissipation and source of structural damping so therefore they have become a subject of interest to many researchers. The aim of this paper is to present some problems regarding research of structural damping and the importance of study Contact Mechanics to better understand the problem of structural damping.",
publisher = "University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy",
journal = "International conference on Contemporary Theory and Practice in Construction XIV",
title = "Experimental analysis of structural damping for bolted and welded splice connection join for IPE-80 steel profile",
volume = "32-42",
doi = "10.7251/STP2014032M"
}

Mijatović, O., Mišković, Z., Salatić, R., Mandić, R., Golubović-Bugarski, V.,& Relja, G.. (2020). Experimental analysis of structural damping for bolted and welded splice connection join for IPE-80 steel profile. in International conference on Contemporary Theory and Practice in Construction XIV
University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy., 32-42.
https://doi.org/10.7251/STP2014032M

Mijatović O, Mišković Z, Salatić R, Mandić R, Golubović-Bugarski V, Relja G. Experimental analysis of structural damping for bolted and welded splice connection join for IPE-80 steel profile. in International conference on Contemporary Theory and Practice in Construction XIV. 2020;32-42.
doi:10.7251/STP2014032M .

Mijatović, Ognjen, Mišković, Zoran, Salatić, Ratko, Mandić, Rastislav, Golubović-Bugarski, Valentina, Relja, Gabriel, "Experimental analysis of structural damping for bolted and welded splice connection join for IPE-80 steel profile" in International conference on Contemporary Theory and Practice in Construction XIV, 32-42 (2020),
https://doi.org/10.7251/STP2014032M . .