شماره ركورد كنفرانس :
3124
عنوان مقاله :
EVALUATION OF COLLAPSE MARGIN FOR RC FRAMES DESIGNED BASED ON IRANIAN SEISMIC CODE
پديدآورندگان :
TOHIDIAN Maryam نويسنده , MANAFPOUR Ali Reza نويسنده
كليدواژه :
Incremental dynamic analyses , Collapse margin ratio , Iranian Seismic Standard , RC frames
عنوان كنفرانس :
مجموعه مقالات هفتمين كنفرانس بين المللي زلزله شناسي و مهندسي زلزله
چكيده فارسي :
One of the main goals of the seismic design philosophy is to design structures so that the structural
collapse to be prevented under intense ground motions. Therefore it is important to quantify the margin of
safety against structural collapse. Nonetheless due to high level of nonlinearity involved in vicinity of
structural collapse the analytical modeling and assessment is complex and demanding, and includes several
sources of uncertainties. Although this issue has attracted considerable interest among seismic engineers and
researchers during several past decades no standard method has been introduced. During the past few years
FEMA has published a guideline for quantification of the building Seismic Performance Factors, i.e.
response modification factor, overstrength factor and displacement amplification factor (FEMA, 2009). As
part of the proposed methodology one can assess the structural collapse potential. The approach includes a
combination of incremental nonlinear dynamic analysis (Vamvatsikos and Cornell, 2002) and suggested
criteria based on semi-probabilistic method to evaluate Collapse Margin Ratio (CMR).
The main objective of this research is to study the collapse margin ratio for reinforced concrete frame
buildings designed according to Iranian seismic standard (Standard 2800). Incremental dynamic analysis
(IDA) is carried out using 22 scaled natural ground motion records. The study includes RC moment resisting
frames with 3, 6 and 10 stories considering two types of soil classifications (Type II and III) and two
alternatives of ductility levels (Intermediate and high ductilties), according to standard 2800. It is concluded
that the RC frame structures designed based on the Iranian Seismic code generally have sufficient margin
against collapse based on the FEMA P695 approach. However the actual margin of collapse varies
depending on the characteristics of the structures
شماره مدرك كنفرانس :
3817028