Projektiranje jeklene stavbe s sipanjem potresne energije v spojih s tornimi dušilci : magistrsko delo

Ivančič, Polona (author), Može, Primož (mentor), Piculin, Sara (comentor)

Magistrsko delo obsega projektiranje jeklene 5-etažne stavbe sestavljene iz momentnih okvirov, s poudarkom na učinkovitem sipanju potresne energije v spojih, opremljenih s tornimi dušilci. Potresnoodporno projektiranje okvirov je izvedeno v skladu s pravili predloga novega standarda Evrokoda 8, ob upoštevanju zahtev v mejnem stanju velikih poškodb (SD) za razred duktilnosti DC2 in DC3. Bistvena sprememba v novi različici Evrokoda 8 je definicija elastičnega spektra pospeškov, ki je določen po dveh različnih postopkih. Ugotovili smo, da so vrednosti spektralnih pospeškov na platoju višje v primerjavi s trenutno veljavnim standardom. Poleg tega je v območju srednje visokih in visokih nihajnih časov potek spektra odziva odvisen od izbranega postopka določitve potresnega vpliva. Pomembne spremembe novega standarda vključujejo opredelitev novih razredov duktilnosti, mejnih stanj, faktorja obnašanja ter koeficienta občutljivosti za etažne pomike pri kontroli vplivov teorije drugega reda, skupaj z novimi omejitvami etažnih pomikov v SD. Potresna analiza momentnih okvirov je izvedena z uporabo ravninskih računskih modelov za tri različne potresne scenarije, pri čemer je potresni vpliv definiran po metodi z vodoravnimi silami. V primeru, ko smo določili potresni vpliv po novem osnutku Evrokoda 8 glede na prvi način, ko sta znana spektralna pospeška, smo dobili lažjo konstrukcijo z manjšimi dimenzijami prerezov elementov. Pri projektiranju momentnih okvirov se izkaže, da je ključna kontrola etažnih pomikov in ne več vplivi TDR. Načrtovanje inovativnih spojev s tornimi dušilci, ki sipajo potresno energijo brez poškodb, je izvedeno v skladu z informativnim dokumentom FREEDAM PLUS, ki predstavlja dodatek k novemu standardu.

• Language: Slovenian
• Keywords: gradbeništvo, magistrska dela, GR, Evrokod 8, potresnoodporno projektiranje, jekleni momentni okviri, spekter pospeškov, mejno stanje velikih poškodb (SD), razred duktilnosti DC2 in DC3, torni dušilec z VFC-konfiguracijo, FREEDAM spoji
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [P. Ivančič]
• Year: 2024
• Number of pages: XXII, 136 str., [215] str. pril.+ [2] f. zganj. pril.
• PID: 20.500.12556/RUL-155424-35977adc-aa8f-604d-2119-53e4ab93c30a
• UDC: 624.014.2:624.072.7(043.3)
• COBISS.SI-ID: 191237635
• Publication date in RUL: 31.03.2024

IVANČIČ, Polona, 2024, Projektiranje jeklene stavbe s sipanjem potresne energije v spojih s tornimi dušilci : magistrsko delo [online]. Master’s thesis. Ljubljana : P. Ivančič. [Accessed 26 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=155424

Secondary language

• Language: English
• Title: Design of a steel building with dissipation of seismic energy in joints with friction dampers : master thesis

Abstract

The master thesis focuses of the design of a 5-storey steel building composed of Moment Resisting Frames (MRFs), with an emphasis on the efficient dissipation of seismic energy in joints equipped with friction dampers. The sesmic design of the MRFs is carried out according to the rules of the new draft Eurocode 8, taking into account the requirements in the Significant Damage (SD) limit state for ductility classes DC2 and DC3. The essential change in the new version of Eurocode 8 is the definition of the elastic response spectrum, which is determined by two different procedures. It has been found that the values of the spectral accelerations at the plateau are higher compared to the current standard. Moreover, in the range of medium and long vibration periods, the response spectrum depends on the chosen seismic action procedure. Significant changes to the new standard include the definition of new ductility classes, limit states, behaviour factor and interstory drift sensitivity coefficient in the control of second-order effects, together with new limitations of interstorey drift at SD. The seismic analysis of MRFs is carried out using planar computational models for three different seismic scenarios, where the seismic impact is defined by the lateral force method. In the case where the seismic action has been determined according to the new Eurocode 8 with respect to the first method, when the spectral accelerations are known, a lighter structure with smaller cross-sections of the elements has been obtained. When designing MRFs, it turns out that the control of interstorey drifts is the key issue, and no longer control of second-order effetcs. The design of innovative joints with friction dampers, which dissipate seismic energy without damage, is carried out in accordance with the FREEDAM PLUS document, which is an addendum to the new standard.

• Keywords: civil engineering, master thesis, Eurocod 8, seismic design, steel Moment Resisting Frames, response spectrum, Significant Damage (SD) limit state, ductility classes 2 (DC2) and 3 (DC3), friction damper with VFC configuration, FREEDAM connections