Title:
Stiffness of Reinforced Concrete Frame Members for Seismic Analysis
Author(s):
Ratnesh Kumar and Yogendra Singh
Publication:
Structural Journal
Volume:
107
Issue:
5
Appears on pages(s):
607-615
Keywords:
bar slip; curvature; effective stiffness; flexural stiffness; reinforced concrete; shear deformation
DOI:
10.14359/51663914
Date:
9/1/2010
Abstract:
Effective stiffness assumption in the modeling of reinforced concrete (RC) frame members is important for seismic design because it directly affects the building periods and dynamic response, particularly deflection and internal force distribution.
Different opinions about the magnitude and governing parameters of effective stiffness persist in different national codes and literature. In this paper, parameters governing the effective stiffness of RC frame members are identified and their relative influence is determined using the three-component approach. Based on parametric study, lower-bound and upper-bound estimates of effective stiffness for the normal range of parameters in RC frame buildings are obtained and verified with experimental results. Various effective stiffness relationships and equations available in literature are also compared. Separate models for the effective stiffness of normal-strength and high-strength concrete members are proposed. The models can be used for the design of buildings without excessive computational effort.