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Določanje raztrosa potresnega odziva armiranobetonskih stavb : doktorska disertacija
Kosič, Mirko (Author), Fajfar, Peter (Mentor) More about this mentor... This link opens in a new window, Dolšek, Matjaž (Co-mentor), Mikoš, Matjaž (Thesis defence commission member), Peruš, Iztok (Thesis defence commission member), Turk, Goran (Thesis defence commission member), Čaušević, Mehmed (Thesis defence commission member)

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Abstract
V doktorski disertaciji smo določali raztros potresnega odziva nekaterih najpogostejših armiranobetonskih konstrukcijskih sistemov stavb, t.j. okvirnih sistemov, sistemov konzolnih sten (stenastih sistemov) in mešanih sistemov, sestavljenih iz konzolnih sten in okvirov. Pri določanju raztrosa potresnega odziva smo upoštevali negotovost zaradi slučajnosti potresne obtežbe, modelne negotovosti in fizikalne negotovosti. Kot mero za intenziteto potresne obtežbe smo uporabili spektralni pospešek pri nihajnem času ekvivalentnega sistema z eno prostostno stopnjo Sa (T*) . Na podlagi obsežnih parametričnih študij skupin testnih konstrukcij smo za obravnavane konstrukcijske sisteme predlagali tipične vrednosti raztrosov potresnega odziva. Raziskave opravljene v okviru doktorske disertacije služijo razvoju poenostavljene verjetnostne metodologije, ki omogoča določanje potresnega tveganja na podlagi metode N2 in vnaprej določenih vrednosti raztrosov odziva. Izdelane študije so omogočile tudi identifikacijo parametrov, ki vplivajo na vrednosti raztrosa zaradi slučajnosti potresne obtežbe in modelnih ter fizikalnih negotovosti. Poleg tipičnih vrednosti raztrosov odziva smo v doktorski disertaciji predlagali tudi poenostavljen postopek za določanje potresnega odziva z upoštevanjem negotovosti. Razvoj postopka je zahteval, da smo za obravnavane konstrukcijske sisteme določili t.i. probabilistične modele z eno prostostno stopnjo (probabilistične modele SDOF), ki omogočajo približno simulacijo vpliva modelnih in fizikalnih negotovosti. Prednost predlaganega postopka je, da potresni odziv in simulacije modelnih ter fizikalnih negotovosti ne izvajamo na nivoju konstrukcijskega modela ampak na nivoju probabilističnega modela SDOF, kar omogoča bistveno zmanjšanje računskega časa v primerjavi z nekaterimi obstoječimi postopki. Rezultate predlaganega postopka smo preverjali z uporabo natančnejših postopkov. Izdelane študije so pokazale, da je predlagani postopek sposoben zagotoviti podobno natančnost rezultatov kot dinamična analiza celotnega konstrukcijskega modela. Hkrati omogoča bistveno zmanjšanje računskega časa.

Language:Slovenian
Keywords:gradbeništvo, disertacije, raztros potresnega odziva, tipične vrednosti raztrosa potresnega odziva, parametri potresnega odziva, metoda za določanje potresnega odziva, modelne negotovosti, fizikalne negotovosti, okvirne AB stavbe, stenaste AB stavbe, mešane AB stavbe
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:[M. Kosič]
Number of pages:XXIII, 154 str., 10 str. pril
Place:Ljubljana
UDC:624.042.7(043.3)
COBISS.SI-ID:6792289 This link opens in a new window
Views:2848
Downloads:543
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Secondary language

Language:English
Title:Determination of dispersion measures for seismic response of reinforced concrete buildings
Abstract:
The studies performed in the doctoral dissertation focused on estimation of the seismic response of some of the most typical reinforced concrete (RC) building structures, i.e. frame structures, cantilever wall structures and dual structures composed of frames and cantilever walls. The seismic response of structures was calculated by taking into account record-to-record variability (randomness) and modelling uncertainty. The spectral acceleration at the period of the equivalent SDOF model Sa (T*) was used as the intensity measure. Default dispersion measures were proposed for the considered structures, based on extensive numerical studies of a portfolio of archetypal structural systems, which have contributed to the development of the practice-oriented risk assessment methodology based on the N2 method and predetermined dispersion measures. The identification of the structural parameters that influence the values of dispersion measures was also made, and their values were given. In addition, a simplified procedure for seismic response assessment with consideration of uncertainty was proposed. The development of the proposed procedure relied on the determination of the so-called probabilistic single degree of freedom model (probabilistic SDOF model), which allows approximate simulation of modelling uncertainty. The major advantage of the proposed procedure is that both seismic response assessment and simulation of modelling uncertainty are performed at the level of the probabilistic SDOF model. Such an approach allows significant reduction of computational time in comparison to some existing procedures. The results of the proposed procedure were validated by the employment of more accurate procedures. It was shown that the proposed procedure allows a considerable reduction of computational efforts, but still provides comparable accuracy as some existing procedures.

Keywords:civil engineering, thesis, dispersion of seismic response, default dispersion measures, seismic response parameters, methods for seismic response assessment, modelling uncertainties, physical uncertainties, RC frame buildings, RC wall buildings, RC dual buildings

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