TY - CHAP AU - Kezh, Sardasht AU - Vigh, László Gergely ED - Di, Trapani F. ED - Demartino, C. ED - Marano, G.C. ED - Monti, G. TI - Probabilistic Fragility Analysis of Smart Steel Moment-Resisting Frame Structure Subjected to Intentional Blast Loading VL - 326 LNCE PB - Springer Science+Business Media SN - 9783031301247 T3 - Lecture Notes in Civil Engineering, ISSN 2366-2557 ; 326 LNCE. PY - 2023 SP - 362 EP - 376 PG - 15 DO - 10.1007/978-3-031-30125-4_33 UR - https://m2.mtmt.hu/api/publication/34029354 ID - 34029354 N1 - Export Date: 22 June 2023 Correspondence Address: Weli, S.S.; Department of Structural Engineering, Műegyetem Rkp. 3, Hungary; email: sardasht.sardar@emk.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Kezh, Sardasht AU - Vigh, László Gergely TI - Blast reliability assessment and sensitivity analysis of steel MRFs equipped with NiTi SMA bolts JF - ENGINEERING STRUCTURES J2 - ENG STRUCT VL - 286 PY - 2023 PG - 13 SN - 0141-0296 DO - 10.1016/j.engstruct.2023.116137 UR - https://m2.mtmt.hu/api/publication/33939747 ID - 33939747 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund [TKP2021] Funding text: Acknowledgments The research reported in this paper is part of project No. BME-NVA-02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund, and financed under the TKP2021 funding scheme. AB - The probabilistic-based assessment of Moment Resisting Frame structure (MRFs) is significantly vital due to the high volatility of blast wave propagation parameters, material strength, and strain rate effect. In this study, the reliability and sensitivity of steel MRFs equipped with Nickel Titanium Shape Memory Alloy (NiTi SMA), and smart MRFs, subjected to Vehicle Borne Improvised Explosive Device (VBIED) are assessed. Since Eurocode does not address the design of a smart structure subjected to blast loading, the smart MRFs are designed based on the Eurocode-complying key design procedures proposed by the author's previous works. It is always a question if the structure designed based on the proposed Eurocode-complying design methodology satisfies the safety level criteria. The newly developed reliability framework approach by the authors is employed to assess the safety level of the smart MRFs based on the criteria given in the international probabilistic design provisions. Performance functions are parameterized based on three failure modes: axial force and bending moments (global buckling) in the columns, maximum rotation demand at the connections, and system-level structural integrity through Inter-Story Drift Ratio (ISDR). The uncertainties of the charge weight, material strength, gravity loads, model uncertainties, connection behavior parameters, strain rate effects, and column cross-sectional dimensions are considered. The proposed reliability framework is applied to the 4-story, 7-story, 10-story, and 15-story smart MRFs. The results show that the developed smart MRFs satisfy the safety level criteria recommended in the international provisions' probabilistic design requirement. Furthermore, the reliability-based outcome confirms the efficiency and applicability of the proposed Eurocode complying key design procedures and verifies the deterministic results of the smart MRFs. Finally, the sensitivity of the smart structures to various uncertain parameters is investigated. Among all the parameters, it is found that the Reliability Index (beta) of the smart MRFs is more sensitive to the uncertainties of charge weight, column web length(s), connection behavior parameters, and material strength. The sensitivity analysis shows that the smart MRFs are safe under unknown extreme conditions, a very high Coefficient of Variation (COV). LA - English DB - MTMT ER - TY - JOUR AU - Kezh, Sardasht AU - Vigh, László Gergely TI - Reliability Assessment Methodology of Blast Protective Steel Moment Resisting Frame Using NiTi SMA-based Connection JF - PERIODICA POLYTECHNICA-CIVIL ENGINEERING J2 - PERIOD POLYTECH CIV ENG VL - 67 PY - 2023 IS - 3 SP - 671 EP - 682 PG - 12 SN - 0553-6626 DO - 10.3311/PPci.20493 UR - https://m2.mtmt.hu/api/publication/33939745 ID - 33939745 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary from the National Research, Development, and Innovation Fund [TKP2021] Funding text: Acknowledgment The research reported in this paper is part of project no. BME-NVA-02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development, and Innovation Fund, financed under the TKP2021 funding scheme. AB - This paper proposes a methodology framework for the reliability assessment of smart steel Moment Resisting Frame structures (MRFs) equipped with Nickle Titanium Shape Memory Alloy (NiTi SMA) connections subjected to blast loading. The reliability assessment framework is formulated based on a two-step approach algorithm. In the 1st Step, the Monte Carlo Latin Hypercube Sampling Strategy simulation (MC-LHS) is adapted to generate the uncertain parameters sample points. Considering the numerical simulations, the 2nd Step employs simplified performance functions and the generated random outcomes from the 1st Step. The proposed reliability approach is verified against direct Monte Carlo Simulation (MCS) and First-Order Reliability Method (FORM). The performance functions are columns' axial force and bending moments, rotation capacity at the connections, and Inter-Story Drift Ratio (ISDR). Throughout the development of the reliability assessment, the probabilistic models are parametrized on geometrical properties, material properties, vertical loads, model errors, and charge weights. The developed reliability framework is applied to a prototype 4-story smart MRF. The structural safety level is obtained in terms of the Reliability Index (beta). The results show that the reliability framework provides an accurate and efficient structural collapse prediction of the MRFs equipped with NiTi SMA-based connections. Finally, sensitivity analysis is performed to indicate the sensitivity of building collapse to blast wave characteristics, material strength, vertical gravity loads, and column profile dimensions. The sensitivity analysis results also confirm the efficiency of the proposed reliability framework in observing the highly sensitive parameters, which is explosive charge weight. LA - English DB - MTMT ER - TY - JOUR AU - Vigh, László Gergely AU - Honfi, Dániel AU - Dunai, László AU - Zsarnóczay, Ádám AU - Simon, József AU - Dohány, Máté AU - Berki, Zsolt József TI - Seismic resilience assessment of critical infrastructures – Case study of M1 highway bridges JF - SCIENTIA ET SECURITAS J2 - SCI SEC VL - 2 PY - 2022 IS - 4 SP - 440 EP - 451 PG - 12 SN - 2732-2688 DO - 10.1556/112.2021.00073 UR - https://m2.mtmt.hu/api/publication/32766449 ID - 32766449 N1 - Kötetszámozás: Vol 2 (2021), online megjelenés: 2022. 03. AB - Safety and security of critical infrastructure networks is one of today’s top priorities, as they are getting increasingly complex and interdependent. Thus, their potential failure due to unforeseen and extreme events may result in exces-sive direct and indirect losses. Recently, focus has shifted from protection to resilience, i.e. the ability of a system exposed to a hazard not only to resist, but accommodate to and recover from the hazard effects.This paper – by the implementation of the IMPROVER technological resilience analysis – demonstrates the seis-mic technological resilience assessment of a section of M1 Highway in Hungary. Resilience against the community’s tolerances as well as risk-based resilience indicators are evaluated. The results suggest that technological resilience could be improved, thus certain resilience treatment options are highlighted. LA - English DB - MTMT ER - TY - JOUR AU - Kezh, Sardasht AU - Vigh, László Gergely TI - Blast Performance Evaluation of Steel Moment-Resisting Frame Equipped with Smart Bolted Connection JF - JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES J2 - J PERFORM CONSTR FAC VL - 35 PY - 2021 IS - 5 SN - 0887-3828 DO - 10.1061/(ASCE)CF.1943-5509.0001629 UR - https://m2.mtmt.hu/api/publication/32461566 ID - 32461566 N1 - Cited By :3 Export Date: 9 June 2022 CODEN: JPCFE Correspondence Address: Weli, S.S.; Dept. of Structural Engineering, Hungary; email: sardasht.sardar@epito.bme.hu AB - This paper deterministically evaluates the blast performance of steel moment-resisting frame (MRF) smart structures equipped with nickel titanium shape-memory alloy (NiTi SMA) bolted connections. The recentering capacity of the NiTi SMA bolts is exploited to limit the structural damage and reduce the residual drift after a near-field explosion event. A simplified blast over-pressure calculation approach is used to draw the blast overpressure profile. Numerically, the NiTi SMA–based connection is designed conforming to current European standards and is modeled with a solid finite element. The effect of high-strain-rate actions is considered. The response of the NiTi SMA–based connection is obtained by the nonlinear transient analysis and compared with the steel bolted connection. The NiTi SMA–based connection provided excellent recentering capacity. Later, the moment-rotation response of the NiTi SMA–based connection is utilized in the MRF structure. A simplified self-centering connection is proposed to produce smart behavior in the MRF structures. The results reveal that using NiTi SMA connections keep interstory drift relatively low and substantially provide reasonable structural lateral resistance under near-field blast loading. LA - English DB - MTMT ER - TY - JOUR AU - Kezh, Sardasht AU - Vigh, László Gergely TI - Behaviour of Smart Steel Column‐Beam Connection Under Blast Loading JF - CE/PAPERS J2 - CE/PAPERS VL - 4 PY - 2021 IS - 2-4 SP - 857 EP - 865 PG - 9 SN - 2509-7075 DO - 10.1002/cepa.1371 UR - https://m2.mtmt.hu/api/publication/32461563 ID - 32461563 LA - English DB - MTMT ER - TY - CHAP AU - Budaházy, Viktor AU - Kollár, Dénes AU - Vigh, László Gergely ED - František, Wald ED - Michal, Jandera TI - Simulation based imperfections and their effects on stability resistance T2 - SDSS 2019 - International Colloquium on Stability and Ductility of Steel Structures PB - CRC Press CY - Boca Raton, Florida SN - 9780367335038 PY - 2019 SP - 205 EP - 212 PG - 8 UR - https://m2.mtmt.hu/api/publication/31201387 ID - 31201387 N1 - Funding Agency and Grant Number: BME FIKP-VIZ by EMMI Funding text: Support of grant BME FIKP-VIZ by EMMI is kindly acknowledged. AB - The fabrication process of a steel structural member fundamentally determines its imperfections. The accuracy of cutting, the spring-back during cold forming, and the specification of welding procedure leads to residual stresses and distortions. In design according to the Eurocodes, engineer can use the equivalent geometric imperfections in geometrically and materially nonlinear analysis simulation. In certain cases, it is difficult to determine the amplitude of equivalent geometric imperfections, which can take the fabrication process into account, and the detailed knowledge of the stress and distortion can result in a more accurate design process. Primary aim of this paper is to illustrate the methodology of simulation based imperfection analysis and resistance computation, as well as to discuss the applicability of the method. In the paper, the calculation of axially compressed, cold-formed and welded members is presented, where the total fabrication and loading process are investigated based on numerical simulations. We compare the resistance of the member using equivalent geometric imperfections and considering the complete fabrication process. LA - English DB - MTMT ER - TY - CONF AU - Kezh, Sardasht AU - Vigh, László Gergely ED - Baksa, Attila ED - Bertóti, Edgár ED - Kiss, László Péter ED - Szirbik Sándor, Mátyás TI - Pushover analysis based assessment of smart structures subjected to external blast loading T2 - XIII. Magyar Mechanikai Konferencia elektronikus kiadványa (pendrive) PB - Miskolci Egyetem Műszaki Mechanikai Intézet CY - Miskolc-Egyetemváros SN - 9789633581810 PY - 2019 SP - 1 EP - 11 PG - 11 UR - https://m2.mtmt.hu/api/publication/31038426 ID - 31038426 LA - English DB - MTMT ER - TY - CONF AU - Vigh, László Gergely AU - Zsarnóczay, Ádám AU - Mahler, András AU - Bán, Zoltán ED - Baksa, Attila ED - Bertóti, Edgár ED - Kiss, László Péter ED - Szirbik Sándor, Mátyás TI - Helyi spektrumok előállítása és alkalmazása földrengésre történő méretezésre T2 - XIII. Magyar Mechanikai Konferencia elektronikus kiadványa (pendrive) PB - Miskolci Egyetem Műszaki Mechanikai Intézet CY - Miskolc-Egyetemváros SN - 9789633581810 PY - 2019 SP - 1 EP - 8 PG - 8 UR - https://m2.mtmt.hu/api/publication/31038416 ID - 31038416 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Mahler, András AU - Bán, Zoltán AU - Hübner, Balázs AU - Zsarnóczay, Ádám AU - Vigh, László Gergely ED - Huszák, Tamás TI - Földrengésteher meghatározásának geotechnikai vonatkozásai T2 - 5. Kézdi Konferencia PB - Magyar Geotechnikai Egyesület CY - Pécs SN - 9786150052816 PY - 2019 SP - 17 EP - 37 PG - 21 UR - https://m2.mtmt.hu/api/publication/31010071 ID - 31010071 LA - Hungarian DB - MTMT ER -