Inelastic Three-Dimensional Response Analysis of Reinforced Concrete Building Structures (IDARC-3D). Part 1. Modeling

摘要

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 (column, beams, shear-walls) which incorporate the essential characteristics of reinforced concrete behavior. 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 to validate these models and 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.