Comparison of fundamental periods of reinforced shear wall dominant building models with empirical expressions

Empirical formulas for the estimation of the fundamental periods have been included in seismic codes, which mainly depend on building height, material (steel, reinforced concrete (RC)) and structural system type (frame, shear wall, etc.). These formulas have been usually derived from empirical data through regression analysis of the measured fundamental period of existing buildings subjected to seismic actions. A parametric study on 480 different RC building models with shear walls was performed with varied parameters: building height, number of bays and the ratio of shear walls area to floor area. The aim of this paper is to verify these empirical expressions, which are given by different authors and seismic codes and to conclude whether the expressions are good enough as a starting assumption for the design of earthquake resistant buildings.Original Abstract: Empirijski izrazi za procjenu osnovnih perioda su sastavni dio propisa za proracun seizmickih djelovanja te uglavnom ovise o visini, materijalu (celik, armirani beton) i nosivom sustavu(okvir, posmicni zidovi, itd.) gradevine. Ovi izrazi su obicno nastali iz empirijskih podataka kroz analizu mjerenih osnovnih perioda postojecih gradevina pod djelovanjem potresa. Provedena je parametarska studija na 480 modela armiranobetonskih zgrada s posmicnim zidovima s razlicitim ulaznim podacima: visina zgrade, broj raspona i omjer povrsine posmicnih zidova i tlocrtne povrsine zgrade. Cilj ovog istrazivanja je provjeriti empirijske izraze razlicitih autora i seizmickih propisa u svrhu provjere tocnosti izraza kao pocetnih pretpostavki kod projektiranja potresno otpornih gradevina.