TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Radu, Dorin
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Bancila, Radu
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7777
AB  - Numerous roads and railways network steel bridges exist with more than 100 years in service, often of great historical value. The in-service safety assessment of these structures is a complex problem which requires interdisciplinary approaches – from civil engineering application of Eurocodes or European recommendation for fatigue life estimation, up to an in-depth assessment by means of fracture mechanics. This article emphasizes the importance of rehabilitating the structure of existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures. Toward this aim, the study case for a historical riveted steel bridge build in the beginning of the twentieth century is presented, with an assessment method considering the structural integrity by means of fracture mechanics. Based on this case study, the paper is proposing an algorithm to assess historical steel bridges. The results of in-depth XFEM analysis with different crack size in the area of a riveted joint are also presented, in order to validate the algorithm.
PB  - Elsevier
T2  - Engineering Fracture Mechanics
T1  - Residual life assessment of the historical road riveted bridges
SP  - 109960
VL  - 299
DO  - 10.1016/j.engfracmech.2024.109960
ER  - 

@article{
author = "Sedmak, Aleksandar and Radu, Dorin and Aranđelović, Mihajlo and Sedmak, Simon and Bancila, Radu",
year = "2024",
abstract = "Numerous roads and railways network steel bridges exist with more than 100 years in service, often of great historical value. The in-service safety assessment of these structures is a complex problem which requires interdisciplinary approaches – from civil engineering application of Eurocodes or European recommendation for fatigue life estimation, up to an in-depth assessment by means of fracture mechanics. This article emphasizes the importance of rehabilitating the structure of existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures. Toward this aim, the study case for a historical riveted steel bridge build in the beginning of the twentieth century is presented, with an assessment method considering the structural integrity by means of fracture mechanics. Based on this case study, the paper is proposing an algorithm to assess historical steel bridges. The results of in-depth XFEM analysis with different crack size in the area of a riveted joint are also presented, in order to validate the algorithm.",
publisher = "Elsevier",
journal = "Engineering Fracture Mechanics",
title = "Residual life assessment of the historical road riveted bridges",
pages = "109960",
volume = "299",
doi = "10.1016/j.engfracmech.2024.109960"
}

Sedmak, A., Radu, D., Aranđelović, M., Sedmak, S.,& Bancila, R.. (2024). Residual life assessment of the historical road riveted bridges. in Engineering Fracture Mechanics
Elsevier., 299, 109960.
https://doi.org/10.1016/j.engfracmech.2024.109960

Sedmak A, Radu D, Aranđelović M, Sedmak S, Bancila R. Residual life assessment of the historical road riveted bridges. in Engineering Fracture Mechanics. 2024;299:109960.
doi:10.1016/j.engfracmech.2024.109960 .

Sedmak, Aleksandar, Radu, Dorin, Aranđelović, Mihajlo, Sedmak, Simon, Bancila, Radu, "Residual life assessment of the historical road riveted bridges" in Engineering Fracture Mechanics, 299 (2024):109960,
https://doi.org/10.1016/j.engfracmech.2024.109960 . .

TY  - JOUR
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Boldus, Dorel
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7115
AB  - Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modern functional role that fits functionally into the landscape.
The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values
are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack.
to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent
iterative solver – applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of
cycles for a number of blocks (one block representing all the applied cycles of stress ranges).
T2  - Procedia Structural Integrity
T1  - Solution for consolidation and retrofitting a historical steel bridge
EP  - 778
SP  - 771
VL  - 37
DO  - 10.1016/j.prostr.2022.02.008
ER  - 

@article{
author = "Radu, Dorin and Bancila, Radu and Boldus, Dorel and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modern functional role that fits functionally into the landscape.
The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values
are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack.
to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent
iterative solver – applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of
cycles for a number of blocks (one block representing all the applied cycles of stress ranges).",
journal = "Procedia Structural Integrity",
title = "Solution for consolidation and retrofitting a historical steel bridge",
pages = "778-771",
volume = "37",
doi = "10.1016/j.prostr.2022.02.008"
}

Radu, D., Bancila, R., Boldus, D., Sedmak, S.,& Aranđelović, M.. (2022). Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity, 37, 771-778.
https://doi.org/10.1016/j.prostr.2022.02.008

Radu D, Bancila R, Boldus D, Sedmak S, Aranđelović M. Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity. 2022;37:771-778.
doi:10.1016/j.prostr.2022.02.008 .

Radu, Dorin, Bancila, Radu, Boldus, Dorel, Sedmak, Simon, Aranđelović, Mihajlo, "Solution for consolidation and retrofitting a historical steel bridge" in Procedia Structural Integrity, 37 (2022):771-778,
https://doi.org/10.1016/j.prostr.2022.02.008 . .

TY  - CONF
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Boldus, Dorel
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3738
AB  - Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modem functional role that fits functionally into the landscape. The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent iterative solver - applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of cycles for a number of blocks (one block representing all the applied cycles of stress ranges).
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
T1  - Solution for consolidation and retrofitting a historical steel bridge
EP  - 778
SP  - 771
VL  - 37
DO  - 10.1016/j.prostr.2022.02.008
ER  - 

@conference{
author = "Radu, Dorin and Bancila, Radu and Boldus, Dorel and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modem functional role that fits functionally into the landscape. The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent iterative solver - applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of cycles for a number of blocks (one block representing all the applied cycles of stress ranges).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)",
title = "Solution for consolidation and retrofitting a historical steel bridge",
pages = "778-771",
volume = "37",
doi = "10.1016/j.prostr.2022.02.008"
}

Radu, D., Bancila, R., Boldus, D., Sedmak, S.,& Aranđelović, M.. (2022). Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
Elsevier Science Bv, Amsterdam., 37, 771-778.
https://doi.org/10.1016/j.prostr.2022.02.008

Radu D, Bancila R, Boldus D, Sedmak S, Aranđelović M. Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021). 2022;37:771-778.
doi:10.1016/j.prostr.2022.02.008 .

Radu, Dorin, Bancila, Radu, Boldus, Dorel, Sedmak, Simon, Aranđelović, Mihajlo, "Solution for consolidation and retrofitting a historical steel bridge" in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021), 37 (2022):771-778,
https://doi.org/10.1016/j.prostr.2022.02.008 . .

TY  - CONF
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6505
AB  - Sustainability has become an increasingly important component of requirements for the rehabilitation of bridge structures.
Responsible use of our limited natural resources is essential for future generations, so the whole bridge rehabilitation process must
be taken into account, in terms of structural integrity. The environmental impact for these types of structures is major – demolition
and reconsideration of e.g. reinforced concrete structure being examples of poor management of resources and energy. On the
existing roads and railways network steel bridges with more than 100 years in service lifetime are numerous. The in-service safety
assessment of these structures is a complex problem. This article emphasizes the importance of rehabilitating the structure of
existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures,
part of sustainable development. The paper is presenting a study case for an historical riveted steel bridge build in the beginning of
twentieth century, with an assessment method considering the structural integrity by means of fracture mechanics
PB  - Elsevier
C3  - Procedia Structural Integrity
T1  - Residual life of a historic riveted steel bridge - engineering critical assessment approach
EP  - 1112
SP  - 1106
VL  - 42
DO  - 10.1016/j.prostr.2022.12.141
ER  - 

@conference{
author = "Radu, Dorin and Bancila, Radu and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainability has become an increasingly important component of requirements for the rehabilitation of bridge structures.
Responsible use of our limited natural resources is essential for future generations, so the whole bridge rehabilitation process must
be taken into account, in terms of structural integrity. The environmental impact for these types of structures is major – demolition
and reconsideration of e.g. reinforced concrete structure being examples of poor management of resources and energy. On the
existing roads and railways network steel bridges with more than 100 years in service lifetime are numerous. The in-service safety
assessment of these structures is a complex problem. This article emphasizes the importance of rehabilitating the structure of
existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures,
part of sustainable development. The paper is presenting a study case for an historical riveted steel bridge build in the beginning of
twentieth century, with an assessment method considering the structural integrity by means of fracture mechanics",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Residual life of a historic riveted steel bridge - engineering critical assessment approach",
pages = "1112-1106",
volume = "42",
doi = "10.1016/j.prostr.2022.12.141"
}

Radu, D., Bancila, R., Sedmak, S.,& Aranđelović, M.. (2022). Residual life of a historic riveted steel bridge - engineering critical assessment approach. in Procedia Structural Integrity
Elsevier., 42, 1106-1112.
https://doi.org/10.1016/j.prostr.2022.12.141

Radu D, Bancila R, Sedmak S, Aranđelović M. Residual life of a historic riveted steel bridge - engineering critical assessment approach. in Procedia Structural Integrity. 2022;42:1106-1112.
doi:10.1016/j.prostr.2022.12.141 .

Radu, Dorin, Bancila, Radu, Sedmak, Simon, Aranđelović, Mihajlo, "Residual life of a historic riveted steel bridge - engineering critical assessment approach" in Procedia Structural Integrity, 42 (2022):1106-1112,
https://doi.org/10.1016/j.prostr.2022.12.141 . .

TY  - JOUR
AU  - Radu, Dorin
AU  - Sedmak, Aleksandar
AU  - Bancila, Radu
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2866
AB  - Engineering critical assessment can be considered as a mandatory request in the civil engineering designing and manufacturing process. The paper is presenting the procedure for determination of crack acceptability based on fracture toughness with failure assessment methods (FAD-1 and FAD-2) which is applied to a cylindrical steel shell structure with welded joints which is having the wind as the main load [7]. The stresses in the structure were determined based on a structural analysis. According to [3] an in depth finite element analysis was applied to the segment joint of the steel shell element (pillar), thus revealing the stresses in the joint (as well in the welded joints). There were assessed common types of flaws met at steel shell cylindrical structure elements using failure assessment diagrams - level 1 - FAD-1. The results are presenting the acceptability level for each type of flaw with comparative graphs, determining also the critical dimension of the flaw. For each flaw was calculated the failure assessment diagram level 2 (FAD-2). Comparisons between groups of flaws were done, revealing the critical crack like flaw. Also the critical values of flaw dimensions were calculated for each flaw type [7]. The methodology establishes clear rules for assessment of structural elements with cracks, determining the initial flaws, assessed flaws and critical values of the cracks. The conclusion of the research reveals the fracture resistance failure susceptibility of different parts of the segment joint given an existing discovered flaw. Based on the detailed procedures described in the paper, on conclusions to the assessment done on each type of flaw, the method can be applied from the design phase on these types of structure elements.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Determining the crack acceptability in the welded joints of a wind loaded cylindrical steel shell structure
EP  - 353
SP  - 341
VL  - 91
DO  - 10.1016/j.engfailanal.2018.04.032
ER  - 

@article{
author = "Radu, Dorin and Sedmak, Aleksandar and Bancila, Radu",
year = "2018",
abstract = "Engineering critical assessment can be considered as a mandatory request in the civil engineering designing and manufacturing process. The paper is presenting the procedure for determination of crack acceptability based on fracture toughness with failure assessment methods (FAD-1 and FAD-2) which is applied to a cylindrical steel shell structure with welded joints which is having the wind as the main load [7]. The stresses in the structure were determined based on a structural analysis. According to [3] an in depth finite element analysis was applied to the segment joint of the steel shell element (pillar), thus revealing the stresses in the joint (as well in the welded joints). There were assessed common types of flaws met at steel shell cylindrical structure elements using failure assessment diagrams - level 1 - FAD-1. The results are presenting the acceptability level for each type of flaw with comparative graphs, determining also the critical dimension of the flaw. For each flaw was calculated the failure assessment diagram level 2 (FAD-2). Comparisons between groups of flaws were done, revealing the critical crack like flaw. Also the critical values of flaw dimensions were calculated for each flaw type [7]. The methodology establishes clear rules for assessment of structural elements with cracks, determining the initial flaws, assessed flaws and critical values of the cracks. The conclusion of the research reveals the fracture resistance failure susceptibility of different parts of the segment joint given an existing discovered flaw. Based on the detailed procedures described in the paper, on conclusions to the assessment done on each type of flaw, the method can be applied from the design phase on these types of structure elements.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Determining the crack acceptability in the welded joints of a wind loaded cylindrical steel shell structure",
pages = "353-341",
volume = "91",
doi = "10.1016/j.engfailanal.2018.04.032"
}

Radu, D., Sedmak, A.,& Bancila, R.. (2018). Determining the crack acceptability in the welded joints of a wind loaded cylindrical steel shell structure. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 91, 341-353.
https://doi.org/10.1016/j.engfailanal.2018.04.032

Radu D, Sedmak A, Bancila R. Determining the crack acceptability in the welded joints of a wind loaded cylindrical steel shell structure. in Engineering Failure Analysis. 2018;91:341-353.
doi:10.1016/j.engfailanal.2018.04.032 .

Radu, Dorin, Sedmak, Aleksandar, Bancila, Radu, "Determining the crack acceptability in the welded joints of a wind loaded cylindrical steel shell structure" in Engineering Failure Analysis, 91 (2018):341-353,
https://doi.org/10.1016/j.engfailanal.2018.04.032 . .

TY  - CONF
AU  - Radu, Dorin
AU  - Sedmak, Aleksandar
AU  - Bancila, Radu
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2590
AB  - The structural integrity and life assessment can be considered as a mandatory request in the civil engineering designing and manufacturing process. The paper is presenting the procedure for determination of crack acceptability based on fracture toughness with failure assessment methods (FAD-1 and FAD-2) which is applied to a cylindrical steel shell structure with welded joints which is having the wind as a main load. The assessment is using BS7910/2013. Thus were assessed common types of flaws met at steel shell cylindrical structure elements using failure assessment diagrams - level 1 - FAD-1. The results are presenting the acceptability level for each type of flaw with comparative graphs, determining also the critical dimension of the flaw. For each flaw was calculated the failure assessment diagram (FAD-2). Different comparisons between group of flaws were done, revealing the critical crack like flaw. Also the critical value of flaw dimensions were calculated for each flaw type. The methodology establishes clear rules for assessment of structural elements with cracks, determining the initial flaws, assessed flaws and critical values of the cracks. Based on the detailed procedures described in the paper, on conclusions to the assessment done on each type of flaw, the assessment methods can be applied very easy in current design practice with different material characteristics
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 2nd International Conference on Structural Integrity, Icsi 2017
T1  - Structural integrity of a wind loaded cylindrical steel shell structure
EP  - 1220
SP  - 1213
VL  - 5
DO  - 10.1016/j.prostr.2017.07.045
ER  - 

@conference{
author = "Radu, Dorin and Sedmak, Aleksandar and Bancila, Radu",
year = "2017",
abstract = "The structural integrity and life assessment can be considered as a mandatory request in the civil engineering designing and manufacturing process. The paper is presenting the procedure for determination of crack acceptability based on fracture toughness with failure assessment methods (FAD-1 and FAD-2) which is applied to a cylindrical steel shell structure with welded joints which is having the wind as a main load. The assessment is using BS7910/2013. Thus were assessed common types of flaws met at steel shell cylindrical structure elements using failure assessment diagrams - level 1 - FAD-1. The results are presenting the acceptability level for each type of flaw with comparative graphs, determining also the critical dimension of the flaw. For each flaw was calculated the failure assessment diagram (FAD-2). Different comparisons between group of flaws were done, revealing the critical crack like flaw. Also the critical value of flaw dimensions were calculated for each flaw type. The methodology establishes clear rules for assessment of structural elements with cracks, determining the initial flaws, assessed flaws and critical values of the cracks. Based on the detailed procedures described in the paper, on conclusions to the assessment done on each type of flaw, the assessment methods can be applied very easy in current design practice with different material characteristics",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 2nd International Conference on Structural Integrity, Icsi 2017",
title = "Structural integrity of a wind loaded cylindrical steel shell structure",
pages = "1220-1213",
volume = "5",
doi = "10.1016/j.prostr.2017.07.045"
}

Radu, D., Sedmak, A.,& Bancila, R.. (2017). Structural integrity of a wind loaded cylindrical steel shell structure. in Procedia Structural Integrity - 2nd International Conference on Structural Integrity, Icsi 2017
Elsevier Science Bv, Amsterdam., 5, 1213-1220.
https://doi.org/10.1016/j.prostr.2017.07.045

Radu D, Sedmak A, Bancila R. Structural integrity of a wind loaded cylindrical steel shell structure. in Procedia Structural Integrity - 2nd International Conference on Structural Integrity, Icsi 2017. 2017;5:1213-1220.
doi:10.1016/j.prostr.2017.07.045 .

Radu, Dorin, Sedmak, Aleksandar, Bancila, Radu, "Structural integrity of a wind loaded cylindrical steel shell structure" in Procedia Structural Integrity - 2nd International Conference on Structural Integrity, Icsi 2017, 5 (2017):1213-1220,
https://doi.org/10.1016/j.prostr.2017.07.045 . .