TY  - JOUR
AU  - Sekulović, M.
AU  - Nefovska-Danilović, Marija
PY  - 2008
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/194
AB  - Dynamic behavior of multistory flexibly connected steel frames under earthquake excitations is studied in this paper. The numerical model that simultaneously includes nonlinear connection behavior, member yielding and geometrical nonlinearity of the structure is developed. Flexibility of connection is idealized by nonlinear rotational spring and dashpot in parallel. The refined-plastic hinge method is adopted to simulate member plasticity, for which it is assumed to be lumped at the ends of beam elements and base end of columns. A plastic hinge is idealized by nonlinear rotational spring, which is then combined with connection spring to form a resultant spring (spring-in-series). Transient response of the ductile seven-story steel frame under different intensities of the earthquake excitation is investigated. Characteristic results are presented and discussed.
T2  - Engineering Structures
T1  - Contribution to transient analysis of inelastic steel frames with semi-rigid connections
EP  - 989
IS  - 4
SP  - 976
VL  - 30
DO  - 10.1016/j.engstruct.2007.06.004
ER  - 

@article{
author = "Sekulović, M. and Nefovska-Danilović, Marija",
year = "2008",
abstract = "Dynamic behavior of multistory flexibly connected steel frames under earthquake excitations is studied in this paper. The numerical model that simultaneously includes nonlinear connection behavior, member yielding and geometrical nonlinearity of the structure is developed. Flexibility of connection is idealized by nonlinear rotational spring and dashpot in parallel. The refined-plastic hinge method is adopted to simulate member plasticity, for which it is assumed to be lumped at the ends of beam elements and base end of columns. A plastic hinge is idealized by nonlinear rotational spring, which is then combined with connection spring to form a resultant spring (spring-in-series). Transient response of the ductile seven-story steel frame under different intensities of the earthquake excitation is investigated. Characteristic results are presented and discussed.",
journal = "Engineering Structures",
title = "Contribution to transient analysis of inelastic steel frames with semi-rigid connections",
pages = "989-976",
number = "4",
volume = "30",
doi = "10.1016/j.engstruct.2007.06.004"
}

Sekulović, M.,& Nefovska-Danilović, M.. (2008). Contribution to transient analysis of inelastic steel frames with semi-rigid connections. in Engineering Structures, 30(4), 976-989.
https://doi.org/10.1016/j.engstruct.2007.06.004

Sekulović M, Nefovska-Danilović M. Contribution to transient analysis of inelastic steel frames with semi-rigid connections. in Engineering Structures. 2008;30(4):976-989.
doi:10.1016/j.engstruct.2007.06.004 .

Sekulović, M., Nefovska-Danilović, Marija, "Contribution to transient analysis of inelastic steel frames with semi-rigid connections" in Engineering Structures, 30, no. 4 (2008):976-989,
https://doi.org/10.1016/j.engstruct.2007.06.004 . .

TY  - JOUR
AU  - Nefovska-Danilović, Marija
AU  - Sekulović, M.
PY  - 2004
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/71
AB  - The effects of connection flexibility and material yielding on the behavior of plane steel frames subjected to static (monotonic) loads are presented in this paper. Two types of material nonlinearities are considered: flexible nodal connections and material yielding, as well as geometric nonlinearity of the structure. To account for material yielding, a plastic hinge concept is adopted. A flexible connection is idealized by nonlinear rotational spring. Plastic hinge is also idealized by nonlinear rotational spring attached in series with the rotational spring that accounts for connection flexibility. The stiffness matrix for the beam with flexible connections and plastic hinges at its ends is obtained. To illustrate the validity and accuracy of the proposed numerical model, several examples have been conducted.
AB  - U ovom radu prikazan je uticaj fleksibilnosti čvornih veza čeličnih ramova i pojava tečenja materijala na ponašanje čeličnih ramova pri dejstvu statičkog (monotonog) opterećenja. Razmatrana su dva tipa materijalne nelinearnosti: fleksibilnost čvornih veza i tečenje materijala, kao i geometrijska nelinearnost strukture. Da bi se obuhvatio uticaj tečenja materijala, usvojen je koncept plastičnih zglobova. Nelinearno ponašanje čvornih veza modelirano je pomoću rotacione opruge na krajevima grednog elementa. Plastični zglobovi na krajevima grednog elementa modelirani su pomoću rotacionih opruga, koje su sa oprugama za modeliranje nelinearnih čvornih veza vezane redno. Za konačni element sa rotacionim oprugama na krajevima dobijena je matrica krutosti. Prikazani su primeri na kojima je ilustrovano ponašanje čeličnih ramova sa fleksibilnim vezama pri dejstvu statičkog opterećenja.
PB  - Srpsko društvo za mehaniku, Beograd
T2  - Theoretical and Applied Mechanics
T1  - Static inelastic analysis of steel frames with flexible connections
T1  - Statička nelinearna analiza čeličnih ramova sa fleksibilnim vezama
EP  - 134
IS  - 2
SP  - 101
VL  - 31
DO  - 10.2298/TAM0402101N
ER  - 

@article{
author = "Nefovska-Danilović, Marija and Sekulović, M.",
year = "2004",
abstract = "The effects of connection flexibility and material yielding on the behavior of plane steel frames subjected to static (monotonic) loads are presented in this paper. Two types of material nonlinearities are considered: flexible nodal connections and material yielding, as well as geometric nonlinearity of the structure. To account for material yielding, a plastic hinge concept is adopted. A flexible connection is idealized by nonlinear rotational spring. Plastic hinge is also idealized by nonlinear rotational spring attached in series with the rotational spring that accounts for connection flexibility. The stiffness matrix for the beam with flexible connections and plastic hinges at its ends is obtained. To illustrate the validity and accuracy of the proposed numerical model, several examples have been conducted., U ovom radu prikazan je uticaj fleksibilnosti čvornih veza čeličnih ramova i pojava tečenja materijala na ponašanje čeličnih ramova pri dejstvu statičkog (monotonog) opterećenja. Razmatrana su dva tipa materijalne nelinearnosti: fleksibilnost čvornih veza i tečenje materijala, kao i geometrijska nelinearnost strukture. Da bi se obuhvatio uticaj tečenja materijala, usvojen je koncept plastičnih zglobova. Nelinearno ponašanje čvornih veza modelirano je pomoću rotacione opruge na krajevima grednog elementa. Plastični zglobovi na krajevima grednog elementa modelirani su pomoću rotacionih opruga, koje su sa oprugama za modeliranje nelinearnih čvornih veza vezane redno. Za konačni element sa rotacionim oprugama na krajevima dobijena je matrica krutosti. Prikazani su primeri na kojima je ilustrovano ponašanje čeličnih ramova sa fleksibilnim vezama pri dejstvu statičkog opterećenja.",
publisher = "Srpsko društvo za mehaniku, Beograd",
journal = "Theoretical and Applied Mechanics",
title = "Static inelastic analysis of steel frames with flexible connections, Statička nelinearna analiza čeličnih ramova sa fleksibilnim vezama",
pages = "134-101",
number = "2",
volume = "31",
doi = "10.2298/TAM0402101N"
}

Nefovska-Danilović, M.,& Sekulović, M.. (2004). Static inelastic analysis of steel frames with flexible connections. in Theoretical and Applied Mechanics
Srpsko društvo za mehaniku, Beograd., 31(2), 101-134.
https://doi.org/10.2298/TAM0402101N

Nefovska-Danilović M, Sekulović M. Static inelastic analysis of steel frames with flexible connections. in Theoretical and Applied Mechanics. 2004;31(2):101-134.
doi:10.2298/TAM0402101N .

Nefovska-Danilović, Marija, Sekulović, M., "Static inelastic analysis of steel frames with flexible connections" in Theoretical and Applied Mechanics, 31, no. 2 (2004):101-134,
https://doi.org/10.2298/TAM0402101N . .

TY  - JOUR
AU  - Šumarac, Dragoslav
AU  - Sekulović, M
AU  - Krajčinović, Dušan
PY  - 2003
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/50
AB  - The present paper investigates deformation of three point bent reinforced concrete (RC) beams analytically (using fracture mechanics), computationally (using finite element method) and experimentally. As the applied force increases the crack is initially trapped by the reinforcement. The debonding of the reinforcement is attributed to the horizontal crack. Simultaneously, the vertical crack propagates driven by the externally applied force. The reinforcement behaves as clasto-plastic spring that decreases the stress intensity factor. The developed analytic model provides estimates of the collapse load, crack length and crack opening displacement. The ultimate loading is estimated by the numerical smeared crack model, incorporated in nonlinear finite element code DIANA. Experimental measurements are used to verify theoretically and numerically obtained results. Special attention is focused on the determination of vertical crack size using graphite and optical fibers.
T2  - International Journal of Damage Mechanics
T1  - Fracture of reinforced concrete beams subjected to three point bending
EP  - 44
IS  - 1
SP  - 31
VL  - 12
DO  - 10.1177/105678903031982
ER  - 

@article{
author = "Šumarac, Dragoslav and Sekulović, M and Krajčinović, Dušan",
year = "2003",
abstract = "The present paper investigates deformation of three point bent reinforced concrete (RC) beams analytically (using fracture mechanics), computationally (using finite element method) and experimentally. As the applied force increases the crack is initially trapped by the reinforcement. The debonding of the reinforcement is attributed to the horizontal crack. Simultaneously, the vertical crack propagates driven by the externally applied force. The reinforcement behaves as clasto-plastic spring that decreases the stress intensity factor. The developed analytic model provides estimates of the collapse load, crack length and crack opening displacement. The ultimate loading is estimated by the numerical smeared crack model, incorporated in nonlinear finite element code DIANA. Experimental measurements are used to verify theoretically and numerically obtained results. Special attention is focused on the determination of vertical crack size using graphite and optical fibers.",
journal = "International Journal of Damage Mechanics",
title = "Fracture of reinforced concrete beams subjected to three point bending",
pages = "44-31",
number = "1",
volume = "12",
doi = "10.1177/105678903031982"
}

Šumarac, D., Sekulović, M.,& Krajčinović, D.. (2003). Fracture of reinforced concrete beams subjected to three point bending. in International Journal of Damage Mechanics, 12(1), 31-44.
https://doi.org/10.1177/105678903031982

Šumarac D, Sekulović M, Krajčinović D. Fracture of reinforced concrete beams subjected to three point bending. in International Journal of Damage Mechanics. 2003;12(1):31-44.
doi:10.1177/105678903031982 .

Šumarac, Dragoslav, Sekulović, M, Krajčinović, Dušan, "Fracture of reinforced concrete beams subjected to three point bending" in International Journal of Damage Mechanics, 12, no. 1 (2003):31-44,
https://doi.org/10.1177/105678903031982 . .

TY  - JOUR
AU  - Sekulović, M
AU  - Salatić, Ratko
AU  - Nefovska-Danilović, Marija
PY  - 2002
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/32
AB  - This paper deals with the effects of flexibility and damping in the nodal connections on the dynamic behavior of plane steel frames, A flexible eccentric connection is idealized by nonlinear rotational spring and dashpot in parallel. Thus, the effects of viscous and hysteretic damping on dynamic response of frame structures are taken into consideration. A numerical model that includes both nonlinear connection behavior and geometric nonlinearity of the structure is developed. The complex dynamic stiffness matrix for the beam with flexible connections and linear viscous dampers at its ends is obtained. Several examples are included to illustrate the efficiency and accuracy of the present model.
PB  - Elsevier Ltd
T2  - Computers & Structures
T1  - Dynamic analysis of steel frames with flexible connections
EP  - 955
IS  - 11
SP  - 935
VL  - 80
DO  - 10.1016/S0045-7949(02)00058-5
ER  - 

@article{
author = "Sekulović, M and Salatić, Ratko and Nefovska-Danilović, Marija",
year = "2002",
abstract = "This paper deals with the effects of flexibility and damping in the nodal connections on the dynamic behavior of plane steel frames, A flexible eccentric connection is idealized by nonlinear rotational spring and dashpot in parallel. Thus, the effects of viscous and hysteretic damping on dynamic response of frame structures are taken into consideration. A numerical model that includes both nonlinear connection behavior and geometric nonlinearity of the structure is developed. The complex dynamic stiffness matrix for the beam with flexible connections and linear viscous dampers at its ends is obtained. Several examples are included to illustrate the efficiency and accuracy of the present model.",
publisher = "Elsevier Ltd",
journal = "Computers & Structures",
title = "Dynamic analysis of steel frames with flexible connections",
pages = "955-935",
number = "11",
volume = "80",
doi = "10.1016/S0045-7949(02)00058-5"
}

Sekulović, M., Salatić, R.,& Nefovska-Danilović, M.. (2002). Dynamic analysis of steel frames with flexible connections. in Computers & Structures
Elsevier Ltd., 80(11), 935-955.
https://doi.org/10.1016/S0045-7949(02)00058-5

Sekulović M, Salatić R, Nefovska-Danilović M. Dynamic analysis of steel frames with flexible connections. in Computers & Structures. 2002;80(11):935-955.
doi:10.1016/S0045-7949(02)00058-5 .

Sekulović, M, Salatić, Ratko, Nefovska-Danilović, Marija, "Dynamic analysis of steel frames with flexible connections" in Computers & Structures, 80, no. 11 (2002):935-955,
https://doi.org/10.1016/S0045-7949(02)00058-5 . .

TY  - JOUR
AU  - Sekulović, M
AU  - Salatić, Ratko
PY  - 2001
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/21
AB  - The effects of flexibility and eccentricity in the nodal connections of plane frames due to static loading are considered in this paper. A numerical model that includes both nonlinear connection behavior and geometric nonlinearity of the structure is developed. Two types of geometric nonlinear analysis are considered: with and without the bowing effect influence. The stiffness matrix for the beam with flexible eccentric connections is developed based on the analytical solution of the second-order analysis equations. The numerical model presented has the same number of degrees of freedom as the corresponding model in the conventional analysis used for the frames with fully rigid connections.
PB  - Elsevier Ltd
T2  - Computers & Structures
T1  - Nonlinear analysis of frames with flexible connections
EP  - 1107
IS  - 11
SP  - 1097
VL  - 79
DO  - 10.1016/S0045-7949(01)00004-9
ER  - 

@article{
author = "Sekulović, M and Salatić, Ratko",
year = "2001",
abstract = "The effects of flexibility and eccentricity in the nodal connections of plane frames due to static loading are considered in this paper. A numerical model that includes both nonlinear connection behavior and geometric nonlinearity of the structure is developed. Two types of geometric nonlinear analysis are considered: with and without the bowing effect influence. The stiffness matrix for the beam with flexible eccentric connections is developed based on the analytical solution of the second-order analysis equations. The numerical model presented has the same number of degrees of freedom as the corresponding model in the conventional analysis used for the frames with fully rigid connections.",
publisher = "Elsevier Ltd",
journal = "Computers & Structures",
title = "Nonlinear analysis of frames with flexible connections",
pages = "1107-1097",
number = "11",
volume = "79",
doi = "10.1016/S0045-7949(01)00004-9"
}

Sekulović, M.,& Salatić, R.. (2001). Nonlinear analysis of frames with flexible connections. in Computers & Structures
Elsevier Ltd., 79(11), 1097-1107.
https://doi.org/10.1016/S0045-7949(01)00004-9

Sekulović M, Salatić R. Nonlinear analysis of frames with flexible connections. in Computers & Structures. 2001;79(11):1097-1107.
doi:10.1016/S0045-7949(01)00004-9 .

Sekulović, M, Salatić, Ratko, "Nonlinear analysis of frames with flexible connections" in Computers & Structures, 79, no. 11 (2001):1097-1107,
https://doi.org/10.1016/S0045-7949(01)00004-9 . .