Analysis Of Infilled Frames Research Articles

Macro-modeling approach incorporating fiber plastic hinge for reinforced concrete frames with masonry infill

An indefinite guide from technical codes around the world leads to confusion and repudiation of masonry infill during the structural design and analysis of infilled frames. In recent years, the rising interest in nonlinear seismic analysis has called for a robust yet simple numerical modeling strategy to model the seismic behavior of reinforced concrete frames with masonry infill. This study aims to propose a reliable macro-modeling approach that incorporates fiber plastic hinge to simulate the in-plane hysteresis response of reinforced concrete frames with masonry infill. An existing constitutive law and a simplified pivot hysteretic law were fine-tuned to describe the nonlinear behavior and cyclic response of the equivalent diagonal strut representing solid clay brick masonry. A comparison with experimental observations showed that the proposed numerical modeling strategy can satisfactorily predict the in-plane global response of infilled frames.

Monotonic Behaviors of Steel Frames with Sandwich Composite Panel Infills: Theoretical and Numerical

Abstract: Analysis of infilled frames is one of the most complicated problems in the structural engineering field. This complication is mainly attributed to the existence of the variety and complex of the infills and the difficulty in modeling the infill-frames interaction. In the present paper, with the aim to study the integral behavior of the single-story single-bay steel frames with sandwich composite panel infills, a proper computational model (the panel is simplified into an equivalent pin-jointed diagonal strut) is proposed. In the theoretical study, both of the panels and steel frames are assumed to be in the linear elastic state for simplicity’s sake, and then the cross-section area of the equivalent strut is obtained by imposing the initial lateral stiffness of actual structure equal to that of simplified model. As a support of the discussion, several numerical models under monotonic lateral loadings are performed by software ABAQUS, in order to verify the theoretical analysis. Finally, results from theoretical study and numerical modeling are compared, which give a satisfactory correlation between them.

Analysis of infilled frames using A coupled finite element and boundary element solution scheme

AbstractThe behaviour of infilled frames subjected to horizontal loads is analysed by an iterative numerical procedure. The stiffness of the structural system is determined with variations in geometrical and mechanical characteristics.The analysis is carried out utilizing the boundary element method (BEM) for the infill and opportunely dividing the frame into finite elements, so as to transform the mutual interactions of the two subsystems into stresses distributed along the boundary for the infill and into nodal actions for the frame.This makes it possible to take into account the separation arising between the two substructures when mutual tensile stresses are involved.At first, infills without openings are considered, using BEM with constant elements for two‐dimensional problems in elasticity.The results are compared with those obtained using the simplified equivalent pin‐jointed strut model, which is very common in the literature.Subsequently, using an analogous procedure, panels with openings are considered. For these systems, for which no satisfactory simplified models exist, the loss of stiffness in relation to the size of the opening is evaluated.