Promjena dinamičkih svojstava dvorca Trakošćan poslije zagrebačkog i petrinjskog potresa iz 2020. godine

master's thesis

• Title (english): Changes in the dynamic properties of the Trakošćan Castle after the Zagreb and Petrinja earthquakes in 2020
• Author: Anja Majurec
• Mentor: Davor Stanko (mentor)
• Mentor: Snježana Markušić (komentor)
• Committee member: Davor Stanko (predsjednik povjerenstva)
• Committee member: Snježana Markušić (član povjerenstva)
• Committee member: Giuliana Verbanac (član povjerenstva)
• Committee member: Maja Telišman Prtenjak (član povjerenstva)
• Committee member: Josip Stipčević (član povjerenstva)
• Committee member: Antun Marki (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geophysics); Zagreb
• Defense date and country: 2024-01-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geophysics; Seismology and Physics of the Earth's Interior

Abstract

Dvorac Trakošćan izgrađen je krajem 13. stoljeća kao osmatračka utvrda u obrambenom sustavu sjeverozapadne Hrvatske te je dio kulturne baštine Republike Hrvatske. Od 16. stoljeća pa sve do 2000. godine dvorac je nekoliko puta bio renoviran i nadograđivan. Zagrebački potres 22. ožujka 2020. godine, lokalne magnitude ML=5.5, s epicentrom 7 kilometara sjeveroistočno od centra Zagreba i potres kod Petrinje 29. prosinca 2020. godine, lokalne magnitude ML=6.2, uzrokovali su oštećenja na dvorcu Trakošćan. Cilj je diplomskog rada mjerenje ambijentalnih vibracija duž visine dvorca Trakošćan te usporedba dobivenih rezultata s mjerenjima provedenim prije potresa 2016. godine. Dinamička svojstva dvorca Trakošćan izračunata su uz pomoć neinvazivne metode omjera horizontalnog i vertikalnog spektra ambijentalnih vibracija, tj. HVSR metode (Horizontal to Vertical Spectral Ratio). Potvrđeno je smanjenje vlastite frekvencije tornja dvorca, drugog i prvog kata, na što su ukazivale pukotine na zidovima nastale nakon potresa 2020. godine. Dvorac Trakošćan nema zadovoljavajuću krutost i post-potresnu deformabilnost te iz tog razloga ne uspijeva odgovoriti adekvatno na seizmičku pobudu. Također, uspoređene su vlastite frekvencije drugog kata dvorca s frekvencijama lokalnog tla, izmjerenim oko dvorca, te je uočeno njihovo poklapanje, što može biti indikator potencijalne rezonancije tlo-dvorac. Ovaj rad može biti poticaj za instalaciju akcelerometara za kontinuirano mjerenje ambijentalnih vibracija i potencijalnih potresa unutar dvorca Trakošćan kako bi se omogućilo kontinuirano praćenje dinamičkih svojstava samog dvorca.

Abstract (english)

Trakošćan Castle was built at the end of the 13th century as an observation fort in the defense system of northwestern Croatia. The cultural heritage of the Trakošćan Castle is protected as historical entity by the Republic of Croatia. From the 16th century until the year 2000, the Castle was renovated and upgraded several times. The Zagreb earthquake on 22 March 2020 of local magnitude ML=5.5, with an epicenter 7 kilometers northeast of the city centre and the Petrinja earthquake on 29 December 2020 of local magnitude ML=6.2, caused damage to Trakošćan Castle. The aim of the thesis was to measure ambient vibrations along the height of the Trakošćan Castle and compare to pre-earthquakes measurements from 2016. The dynamic properties of the Trakošćan Castle were calculated using horizontal to vertical spectral ratio method (HVSR). The decrease in natural frequency of the Castle’s tower, second and first floor was revealed. The natural frequencies of the Castle’s second floor were compared with the frequencies measured around the Castle and imply the existence of possible soil-structure resonance. The Trakošćan Castle doesn’t have satisfactory rigidity and post-earthquake deformability and for this reason it can’t respond properly to seismic excitation. This work can be an incentive to install accelerometers for continuous ambient vibrations measurements and potential earthquakes inside the Trakošćan Castle in order to enable continuous monitoring of the dynamic properties of Castle.

• Keywords: dvorac Trakošćan; zagrebački potres; potres kod Petrinje; ambijentalne vibracije; HVSR metoda
• Keywords (english): Castle Trakošćan; Zagreb earthquake; Petrinja earthquake; ambient vibration measurements; HVSR method
• Language: croatian
• URN:NBN: urn:nbn:hr:217:652233
• Project: Number: IP-2020-02-3531; Title: Procjena seizmičkog rizika građevina kulturne baštine u Hrvatskoj; Title: Seismic risk assessment of cultural heritage buildings in Croatia; Leader: Snježana Markušić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: graduate academic research programme: Master of Physics – geophysics, modules: Seismology and solid Earth physics, Meteorology and physical oceanography; specializations in: Seismology and solid Earth physics, Meteorology and physical oceanography; Course: Seismology and solid Earth physics; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni magistar fizike – geofizike (sveučilišni magistar fizike – geofizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-01-30 10:38:38