Potresna analiza 22-etažne armiranobetonske stavbe

diplomska naloga

Miha Zupanc (Author), Matjaž Dolšek (Mentor), Sebastjan Bratina (Thesis defence commission member), Tatjana Isaković (Thesis defence commission member), Jure Snoj (Co-mentor)

Abstract

V diplomski nalogi naredimo potresno analizo 22-etažne armiranobetonske stavbe v Ljubljani. Preučili smo vpliv različnih predpostavk pri modeliranju objekta, kot so vpliv sekundarnih elementov, vpliv sodelujoče širine plošč, ter vpliv upoštevanja razpokanih prerezov. Izdelali in analizirali smo 5 različnih modelov. V prvem modelu smo modelirali armiranobetonska jedra, stebre in plošče. V drugem modelu smo plošče nadomestili z gredami, s katerimi smo zajeli vpliv sodelujoče širine in togosti plošče. Tretji model vključuje jedra in stebre brez gred. Predvideli smo, da je vpliv stebrov brez prečk majhen in jih lahko obravnavamo kot sekundarne potresne elemente, kar smo preverili s četrtim modelom. Sekundarne potresne elemente je smotrno upoštevati v potresnem modelu, saj tako dobimo njihove deformacije ki jih potrebujemo za nadaljnjo dimenzioniranje, hkrati pa zanemarljivo vplivajo na notranje statične količine v primarnih potresnih elementih. S petim modelom smo preverili vpliv razpokanosti. V vseh modelih smo upoštevali, da so plošče v svoji ravnini toge. Rezultate smo ovrednotili z globalnimi potresnimi zahtevami, kot so nihajni časi in nihajne oblike, etažni pomiki in etažne prečne sile, ter z obremenitvami izbranih konstrukcijskih elementov. Ugotovili smo, da je izbira modela stavbe z močnimi betonskimi jedri in gladkimi ploščami na stebrih pomembna. Vsak model ima prednosti in slabosti. Modeli s sekundarnimi potresnimi elementi so bolj enostavni, z upoštevanjem vseh elementov za prevzem potresne obtežbe pa bolje zajamemo obnašanje konstrukcije. V našem primeru je najbolj smiselno narediti model, kjer modeliramo jedra z lupinastimi elementi, stebre in ploščo pa z linijskimi elementi, pri čemer za ploščo upoštevamo izbrano sodelujočo širino. Tako dobimo dovolj točne rezultate, obenem pa je modeliranje in dimenzioniranje še vedno enostavno. Pomembno je, da se zavedamo, da modeliranje vpliva na potek nadaljnjega projektiranja.

Keywords

gradbeništvo;diplomska naloga;UNI;potresna analiza;konstrukcijski model stavbe;potresnoodporno projektiranje armiranobetonskih konstrukcij;etažne prečne sile;nihajni časi;sekundarni potresni elementi;

Data

Language:	Slovenian
Year of publishing:	2016
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[M. Zupanc]
UDC:	624.042.7(497.4)(043.2)
COBISS:	7620961
Views:	2546
Downloads:	781
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Seismic analysis of a 22-storey reinforced concrete building
Secondary abstract:	The thesis deals with seismic analysis of the 22-storey reinforced concrete building in Ljubljana. The impact of modelling uncertainties, such as the impact of secondary seismic members, impact of effective span of slabs and the impact of taking into account cracked reinforced concrete elements is examined. Five models of the building were developed and analyzed. The first model, with reinforced concrete cores, columns and slabs, is most realistic. In the second mode, the slabs were replaced with beams to illustrate the impact of the effective span of slab. Third model includes core and columns without beams. We anticipate that the impact of the columns is small and they can be considered as a secondary seismic members. That was checked by a fourth model. However, it is convenient to take them into account in the seismic model, which simplifies to obtain deformations in the columns which are needed for dimensioning of these elements, while their impact on the primary seismic members is insignificant. By the fifth model, we examine the impact of cracked reinforced concrete elements. The results of the seismic analysis were evaluated with global seismic requirements, such as period of vibration and forms of oscillation, story displacements, story shears and with loads. We came to the conclusion that the choice of structural model of a building with strong concrete core and plates on the columns is important. Each has advantages and disadvantages. Models with consideration of secondary seismic elements make it possible to better capture the behaviour of the structure and simplify the dimensioning of secondary elements. Based on the results of the study it was concluded that it is most appropriate to make a model with cores, columns and beams with consideration of the effective span of slab. This gives a sufficiently accurate results, but modelling and design remain simple. It is important to be aware that this affects the course of further design.
Secondary keywords:	graduation thesis;seismic analysis;structural model;earthquake-resistant design of reinforced concrete structures;storey shear force;vibration period;secondary seismic members;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XI, 70 str.
ID:	9176128