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Inelastic Three-Dimensional Response Analysis of Reinforced Concrete Building Structures (IDARC-3D): Part I - Modeling

S.K.Kunnath, A.M.Reinhorn

NCEER-89-0011 | 4/17/1989 | 154 pages

About the Report:

TOC: The table of contents is provided.

Notes: The latest version of IDARC is 7.0 and the accompanying report is MCEER-09-0006, which supersedes this report. To learn more about IDARC and the Users Group, click here.

Keywords: Inelastic Response Analysis, Reinforced Concrete Buildings, Seismic Damage Modeling, IDARC-3D, and Structure Modeling.

Abstract: A comprehensive modeling scheme is developed to evaluate the inelastic response of three-dimensional (3D) reinforced concrete buildings under the action of seismic loads. The model integrates 3D inelastic biaxial column elements with inelastic uniaxial beam and shear wall components to represent a realistic model of overall structural behavior. Component modeling is established through the development of element macro-models (columns, beams, shear-walls) which incorporate the essential characteristics of reinforced concrete behavior. A distributed flexibility model with a varying contraflexure point is used for the stiffness formulation. A visco-plastic force-deformation model which is derived from the modified Bouc model and includes the effect of biaxial bending interaction is developed for the column elements. Parametric studies are carried out. For uniaxial behavior, a nonsymmetric trilinear envelope is used in conjunction with an available hysteretic model. A step-by-step incremental dynamic analysis of the assembled macro-models is performed by direct integration using an explicit algorithm based on Newmark's constant-average-acceleration method. The moment-deformation history is monitored at critical sections to update hysteretic parameters. A single step force equilibrium correction is implemented to prevent error accumulation due to unbalanced loads, and an approximate scheme for stiffness updating during unloading/reloading is formulated. P-delta effects are included by considering eccentric floor-weights due to interstory drift. A new seismic damage model is proposed to assess response statistics following earthquake action. Several numerical examples are presented (1) to validate these models and (2) to demonstrate the effectiveness of the modeling schemes to simulate experimental results. Comparative studies with existing analytical models are also carried out. All developments are incorporated into a new modular computer code, IDARC-3D.