TY  - CONF
AU  - Mišković, Zoran
AU  - Savatović, Siniša
AU  - Mišković, Ljiljana
PY  - 2024
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3467
AB  - The paper presents part of the conducted research on laser-displacement sensors for the
measurement of structural response in civil engineering applications. Usually, the level of
displacement in laboratory or on-site testing is in small to mid-range levels of 1.00 to 25.00 mm
and in the frequency range of up to 100 Hz. Appropriate sensors were selected and used
according to performance in the sense of resolution/accuracy.
Experiments are conducted on steel model beam in the laboratory and on-site real bridge
structure. In both analysed cases, data analysis was carried out in the sense of modal frequencies
and damping estimation with comparison with numerically computed values.
Presented are the results of two experiments, a laboratory-tested model of steel beam and an onsite
tested real bridge structure. In both cases have achieved good argument of test results,
estimated modal frequencies and damping of tested model/structure.
Data analyses conducted used a developed MATLAB script, while the numerical computation
conducted used SAP2000_v14 FEM package for structural analysis.
Excellent agreement of extracted results was achieved in the case of the laboratory-tested
structural model, as well as of extracted results of on-site tested real-world structure in the sense
of extracted modal frequencies and modal damping.
Finally, the conclusion is that laser-displacement sensors are quite appropriate for small to midrange
of expected displacement and are quite appropriate for such applications according to the
possibility of installation so that such sensors could be applied for structural testing, particularly
for dynamic testing of such structures because of their possibility of high sampling frequency
and high resolution/accuracy.
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  - Direct laser dynamic displacement measurement of structural response during testing
EP  - 264
SP  - 257
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3467
ER  - 

@conference{
author = "Mišković, Zoran and Savatović, Siniša and Mišković, Ljiljana",
year = "2024",
abstract = "The paper presents part of the conducted research on laser-displacement sensors for the
measurement of structural response in civil engineering applications. Usually, the level of
displacement in laboratory or on-site testing is in small to mid-range levels of 1.00 to 25.00 mm
and in the frequency range of up to 100 Hz. Appropriate sensors were selected and used
according to performance in the sense of resolution/accuracy.
Experiments are conducted on steel model beam in the laboratory and on-site real bridge
structure. In both analysed cases, data analysis was carried out in the sense of modal frequencies
and damping estimation with comparison with numerically computed values.
Presented are the results of two experiments, a laboratory-tested model of steel beam and an onsite
tested real bridge structure. In both cases have achieved good argument of test results,
estimated modal frequencies and damping of tested model/structure.
Data analyses conducted used a developed MATLAB script, while the numerical computation
conducted used SAP2000_v14 FEM package for structural analysis.
Excellent agreement of extracted results was achieved in the case of the laboratory-tested
structural model, as well as of extracted results of on-site tested real-world structure in the sense
of extracted modal frequencies and modal damping.
Finally, the conclusion is that laser-displacement sensors are quite appropriate for small to midrange
of expected displacement and are quite appropriate for such applications according to the
possibility of installation so that such sensors could be applied for structural testing, particularly
for dynamic testing of such structures because of their possibility of high sampling frequency
and high resolution/accuracy.",
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 = "Direct laser dynamic displacement measurement of structural response during testing",
pages = "264-257",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3467"
}

Mišković, Z., Savatović, S.,& Mišković, L.. (2024). Direct laser dynamic displacement measurement of structural response during testing. in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024
University of Montenegro Faculty of Civil Engineering., 257-264.
https://hdl.handle.net/21.15107/rcub_grafar_3467

Mišković Z, Savatović S, Mišković L. Direct laser dynamic displacement measurement of structural response during testing. in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024. 2024;:257-264.
https://hdl.handle.net/21.15107/rcub_grafar_3467 .

Mišković, Zoran, Savatović, Siniša, Mišković, Ljiljana, "Direct laser dynamic displacement measurement of structural response during testing" in The ninth international conference civil engineering science & practice, GNP 2024 proceedings, Kolašin, 5-9 March, 2024 (2024):257-264,
https://hdl.handle.net/21.15107/rcub_grafar_3467 .

TY  - CONF
AU  - Mišković, Zoran
AU  - Lazarević, Vesna
AU  - Ivetić, Milorad
AU  - Hranisavljević, Milorad
AU  - Mišković, Ljiljana
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3233
AB  - The paper presents testing of two piles, diameter of Ø1200mm and Ø800mm, length of 26.0m
and 18.0m respectively. Tests were conducted on construction project WELLPORT III phase -
New Belgrade, Republic of Serbia. The piles were erected using CFA technology by Novkol
jsc. - Belgrade. The tests were conducted according to the standard SRPS EN ISO 22477-1:
2019, jointly by the Laboratory for structures of the Faculty of Civil Engineering University of
Belgrade and Laboratory of Novkol jsc. - Belgrade. In addition, beside to the common and
inevitable measurement of pile settlement with respect to the applied load during test phases,
tests include measurements of strain along the pile depth. Measurements of strain were carried
using so-called ‘sister-bar’ based on resistance principle (classical foil strain gages), as well as
using embedded sensors based on ‘vibrating-wire’ principle of strain measurement, as both
principles of strain measurements are state-off-the-art in actual practice. Installation of all
instruments were incorporated in pile reinforcement assembly at several levels before casting.
During testing, beside to recording force at pile head and settlements by LVDTs which were
leaned on the reference beam, there were recorded and realized strain levels on all installed
instruments. During data reduction phase, computation of actual force was realized at each
section with strain measurement, based on axial stiffness of tested piles. Using such a
procedure, forces in tested piles were calculated. Such data gave possibility to explore part of
force which was transmitted by pile shaft along the depth to the surrounding soil, as well as the
part which goes to the pile base. All results are shown in illustrative diagrams of corresponding
stresses between pile shaft and surrounding soil, force levels along the pile depth, and finally
level of force which transfer by pile shaft and pile base. According to the facts that pile bases
were in different soil level, and with different diameters, the different ratio between force
levels which transferred by pile shaft and pile base were established.
C3  - the 8th international conference "civil engineering – science and practice", GNP 2022 – Kolašin, Montenegro, 8-12 March
T1  - Strain measurements during static pile testing: a case study of two piles with diferent diameter and length
EP  - 264
SP  - 257
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3233
ER  - 

@conference{
author = "Mišković, Zoran and Lazarević, Vesna and Ivetić, Milorad and Hranisavljević, Milorad and Mišković, Ljiljana",
year = "2022",
abstract = "The paper presents testing of two piles, diameter of Ø1200mm and Ø800mm, length of 26.0m
and 18.0m respectively. Tests were conducted on construction project WELLPORT III phase -
New Belgrade, Republic of Serbia. The piles were erected using CFA technology by Novkol
jsc. - Belgrade. The tests were conducted according to the standard SRPS EN ISO 22477-1:
2019, jointly by the Laboratory for structures of the Faculty of Civil Engineering University of
Belgrade and Laboratory of Novkol jsc. - Belgrade. In addition, beside to the common and
inevitable measurement of pile settlement with respect to the applied load during test phases,
tests include measurements of strain along the pile depth. Measurements of strain were carried
using so-called ‘sister-bar’ based on resistance principle (classical foil strain gages), as well as
using embedded sensors based on ‘vibrating-wire’ principle of strain measurement, as both
principles of strain measurements are state-off-the-art in actual practice. Installation of all
instruments were incorporated in pile reinforcement assembly at several levels before casting.
During testing, beside to recording force at pile head and settlements by LVDTs which were
leaned on the reference beam, there were recorded and realized strain levels on all installed
instruments. During data reduction phase, computation of actual force was realized at each
section with strain measurement, based on axial stiffness of tested piles. Using such a
procedure, forces in tested piles were calculated. Such data gave possibility to explore part of
force which was transmitted by pile shaft along the depth to the surrounding soil, as well as the
part which goes to the pile base. All results are shown in illustrative diagrams of corresponding
stresses between pile shaft and surrounding soil, force levels along the pile depth, and finally
level of force which transfer by pile shaft and pile base. According to the facts that pile bases
were in different soil level, and with different diameters, the different ratio between force
levels which transferred by pile shaft and pile base were established.",
journal = "the 8th international conference "civil engineering – science and practice", GNP 2022 – Kolašin, Montenegro, 8-12 March",
title = "Strain measurements during static pile testing: a case study of two piles with diferent diameter and length",
pages = "264-257",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3233"
}

Mišković, Z., Lazarević, V., Ivetić, M., Hranisavljević, M.,& Mišković, L.. (2022). Strain measurements during static pile testing: a case study of two piles with diferent diameter and length. in the 8th international conference "civil engineering – science and practice", GNP 2022 – Kolašin, Montenegro, 8-12 March, 257-264.
https://hdl.handle.net/21.15107/rcub_grafar_3233

Mišković Z, Lazarević V, Ivetić M, Hranisavljević M, Mišković L. Strain measurements during static pile testing: a case study of two piles with diferent diameter and length. in the 8th international conference "civil engineering – science and practice", GNP 2022 – Kolašin, Montenegro, 8-12 March. 2022;:257-264.
https://hdl.handle.net/21.15107/rcub_grafar_3233 .

Mišković, Zoran, Lazarević, Vesna, Ivetić, Milorad, Hranisavljević, Milorad, Mišković, Ljiljana, "Strain measurements during static pile testing: a case study of two piles with diferent diameter and length" in the 8th international conference "civil engineering – science and practice", GNP 2022 – Kolašin, Montenegro, 8-12 March (2022):257-264,
https://hdl.handle.net/21.15107/rcub_grafar_3233 .