| Modeling procedures and numerical techniques for the "Inelastic Dynamic Analysis of Reinforced Concrete Structures in Three Dimensions" have been formulated and implemented to evaluate the response of structures subjected to combined dynamic, static and quasistatic loading. The structural modeling is designed to consider arbitrarily positioned structural elements which comprise of columns, beams, shear-walls, braces, and joint panels, which exhibit nonlinear behavior. Modeling of main elements is done via a macro-modeling behavior, i.e., the whole element is modeled as a single unit while variations of properties and plasticity are captured with models that give equivalent global behavior of the element. This is opposed to the micro-element (finite element) approach, in which the variation in member properties is captured by multiplicity of small elements with different constitutive relations. The advantage of the approach adopted herein, is that the resulting model is more suited for non linear analysis of large structures with multiple elements. The inelastic behavior of bending of members which extend along cracked regions is considered using a newly developed spread plasticity model. The stiffness matrix of such elements is reconstructed by integrating the flexibility distribution along the member, which is in turn dependent on the flexibilities at the ends and the moment distribution along the member.; The structural model also considers special elements end connections including inelastic semi-rigid connections for combined flexure and shear, that vary from the perfect hinge or moment release condition, to the fixed end condition. Specialized modeling and analysis of various retrofit schemes, such as the addition of supplemental dampers or structures on base isolation, is also presented. A host of hysteretic models makes possible versatile modeling of various types of structures. They include both uniaxial models governed by multilinear, or smooth rules, and smooth biaxial models. A procedure was developed for improved convergence of the smooth model for force or pseudo-displacement control applications.; This dissertation presents the modeling techniques, formulation of the global model, suggested solutions for the inelastic dynamic analysis, and several results of verification of the computational modules with experimental data or with other analytical procedures. |
