السلوك الزلزالي للمباني ثلاثية الأبعاد المتعددة الطوابق و الغير متماثلة في عزوم اللي من الخرسانة العادية

Abstract AR

The nonlinear seismic behavior of torsionally asymmetric reinforced concrete 3-D multistory
buildings constructed from Normal-Strength Concrete (NSC) with characteristic cylinder
compressive strength fc
' = 25 MPa and from High-Strength Concrete (HSC) up to fc
' = 100 MPa
has been studied.

In addition, the applicability of the Static Equivalent Lateral Force (SELF)
methods used by the seismic codes in Europe (EC-8), in the United States (ASCE/SEI 7-16) and
in Egypt (ECL-2012) have been examined when applied to torsionally asymmetric multistory
buildings constructed from NSC and HSC.

Inelastic dynamic analysis computer program has
been used to solve the nonlinear equations of motions for two models of 3-D multistory buildings
with different eccentricity (e equal to 0.10L, 0.15L, and 0.20L) and constructed from NSC and
HSC.

Many real and artificial earthquake records with wide ranges of frequency content have
been selected as input ground motions, from them two suitable earthquake records have been
used in the dynamic analysis.

The results showed that increasing the design concrete strength
from NSC ( fc
' = 25 MPa) to HSC ( fc
'= 75 MPa), generally decreases the average story
displacement and the average story drift along the height of the models.

The allowable limits of
the story drift adopted by ASCE/SEI 7-16, EC-8 and ECL-2012 are conservative when applied to
torsionally asymmetric NSC and HSC buildings with the studied eccentricities.

The SELF
method of ECL-2012 was unconservative especially for the upper stories when applied to
torsionally asymmetric NSC and HSC multistory buildings with the studied different
eccentricities while the SELF methods of ASCE/SEI 7-16 and EC-8 were conservative when
applied to torsionally asymmetric NSC and HSC multistory buildings.

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