Naslov
Importance of dynamic characteristics of accelerograms to structural response

Autori
Čizmar, Dean ; Nižić, Angela ; Meštrović, Darko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of SECED conference / Antony Darby, Andrew Heath, Dina D'Ayala - Bath : University of Bath, 2005

Skup
The Society for Earthquake and Civil Engineering Dynamics (SECED) Conference

Mjesto i datum
Bath, Ujedinjeno Kraljevstvo, 21.03.2005. - 22.03.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
time history; spectra curves; earthquake; accelerogram
(time history; spektri odaziva; potres; akcelerogram)

Sažetak
Zeceve Drage bridge is constructed in Croatia, 940.8 m long and it is placed on a horizontal curve. Bridge spans are 2x40+16x50+40 m. Height difference from start to the end of the bridge is approximately 23m. The superstructure is a box girder 12, 5 m wide and 4 m high. In addition to two abutments, the bridge has 18 piers, the highest being 53 m. Structure of Zeceve Drage was calculated using time history analysis based on accelograms (taken from real earthquakes that occurred in Adriatic region) of magnitudes 5.5, 6, 6.5 and 7 (Richter), distances varying 0 to 15 km from epicenter. As expected the greatest seismic forces are obtained for magnitude of 7 but for epicenter distance of 15 km. Maximum ground acceleration is about 40% greater when the epicenter distance is 0 km than in case when we have epicenter distance of 15 km. From those accelograms (acceleration-time) spectrum curves (acceleration-frequency) were obtained. When analyzing spectrum curves we can notice that for frequency range of 0.1-1.5 Hz with epicenter distance being 15 km the acceleration is greater. Analyzing frequencies we notice that bridge has 15 characteristic frequencies that range from 0.24 to 1.58 Hz. From that data is clear why seismic forces are greater when dealing with seismic movement ranging from 0.1 to 1.5 Hz. Time history accelograms of magnitude 7, e=0 and e=15 km are analyzed on a single degree of freedom dynamic model. Decreasing the frequency of model seismic forces of e=15 km are greater than one with epicenter distance of 0 km. This article shows that time history analysis must be carefully conducted especially when dealing with low frequency (high period) structures. It is evident that frequency content of accelogram is more important than peak acceleration.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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