Fiber-based frame analysis

Fiber-based frame analysis is one of the most advanced methodologies to model the nonlinear behavior of beams and columns under combined axial and bending loads. The Mid-America Earthquake Center analysis environment ZEUS-NL (Elnashai et al., 2002), is a compntational tool for the analysis of two and three dimensional frames. In ZEUS-NL, elements capable of modeling material and geometric nonlinearity are available. The forces and moments at a section are obtained by integrating the inelastic responses of individnal fibers. The Eularian approach towards geometric nonlinearity is employed at the element level. Therefore, full account is taken of the spread of... 

The framework for multi-resolution distributed finite element analysis (MDFEA) proposed in this chapter is used to analyze a complex high-rise RC building. The structural walls of this building are modeled with concrete continuum elements while the frames are modeled with fiber-based beam-column elements. The two distinct applications are combined using the MDFEA framework in a step-by-step fashion in the time domain. 

The present subchapter presents a simplified (new) modeling approach based on the work of Zhao et al. (2012) for the nonlinear analysis of SCC beams and composite frames with deformable shear connections (based on the distributed plasticity approach) using line elements to simulate the stmctural beam and column members, layered fiber section to simulate the reinforced concrete slabs, and nonlinear spring elements for the simulation of the interface between the stmctural steel beams and the reinforced concrete slab. Vertical interactions between the slab and steel beams are not expected to be significant, therefore are not accounted into the analysis. The geometry of the model, along with a simple set of details, is outlined below. The assembled model is shown in Fig. 1. 

This section presents a numerical procedure for the nonlinear inelastic analysis of CFS frames based on a fiber beam-to-column element. The nonlinear response of SCC frames is captured through the inelasticity of materials or due to changes in the frame geometry. Global geometric nonlinearities (P-5 effects) are taken into account by the use of stability functions derived from the exact stability solution of a beam-to-colunm element subjected to axial forces and bending... 

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