Antonio Janevski (Author), Tatjana Isaković (Author)

Abstract

V članku je predstavljena analiza potresnega odziva armiranobetonskih (AB) sten, povezanih le s ploščami brez gred, ki jih običajno obravnavamo kot konzolne stene. Raziskali smo, kdaj lahko plošče močno povežejo stene in kako to vpliva na njihov potresni odziv. Nelinearne potisne in analize časovnega odziva so pokazale, da je lahko stopnja povezanosti (CL – Coupling Level) do 50%, zlasti pri konfiguracijah z vitkimi stenami (razmerje višina/širina > 4), kjer se lahko aktivira velika sodelujoča širina plošče. Zaradi močne povezanosti se v slopih razvijejo znatne osne sile (tudi do 80% osnih sil zaradi navpične obtežbe), kar vodi do spremembe togosti in nosilnosti ter prerazporeditev vplivov. Strižne sile so se v posameznih slopih povečale tudi do 50%. Na povečanje strižnih sil vplivajo tudi višje nihajne oblike. Povečanje strižnih sil zaradi okvirnega učinka narašča z večanjem CL, medtem ko vpliv višjih nihajnih oblik upada. Raziskali smo tudi, kdaj je treba korigirati strižne sile, določene z nelinearno potisno analizo, saj slednja ne zajema vpliva višjih nihajnih oblik, ter predlagali enostavne izraze za korekcijo. Odstopanje je bilo v večini primerov manj kot 20%.

Keywords

AB-stene;potresni odziv;stopnja povezanosti;okvirni učinek;vpliv višjih nihajnih oblik;povečanje strižnih sil;nelinearna analiza;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
UDC: 624.041.6:624.012.45
COBISS: 230013699 Link will open in a new window
ISSN: 0017-2774
Views: 123
Downloads: 761
Average score: 0 (0 votes)
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Other data

Secondary language: English
Secondary title: Seismic response of reinforced concrete walls coupled by slabs without coupling beams
Secondary abstract: The article investigates the seismic response of reinforced concrete (RC) walls coupled only by slabs, without coupling beams, a configuration often considered as cantilever walls. The study investigates when slabs significantly couple walls to a significant extent and how this affects their overall seismic behaviour. Non-linear pushover and response history analyses revealed coupling level (CL) of up to 50%, particularly in buildings featuring slender walls (aspect ratio > 4), where a significant effective slab width can be activated. A significant CL caused axial forces in the wall piers to vary by up to 80% of the gravity loads, altering changing stiffness and strength, causing pronounced redistributions of seismic demand among wall piers and amplifying shear forces in individual piers by up to 50%. Additionally, the study highlights that, shear demand can also increase due to higher modes of vibration. While the amplification of shear forces due to frame action increased with increasing CL, it was found that shear force amplification due to higher modes was found to decreased. To address the limitations of non-linear pushover analysis in capturing higher-mode effects, simple correction expressions are proposed, with deviations in most cases under below 20%.
Secondary keywords: RC walls;seismic response;coupling level;frame action;higher mode effects;shear amplification;non-linear analysis;
Type (COBISS): Article
Pages: str. 29-44
Issue: ǂLetn. ǂ74
Chronology: mar. 2025
ID: 26107012