An Analytical Study of the Interaction of Frames and Infill Masonry Walls
Rivero, Carmelo Eduardo
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https://hdl.handle.net/2142/69919
Description
Title
An Analytical Study of the Interaction of Frames and Infill Masonry Walls
Author(s)
Rivero, Carmelo Eduardo
Issue Date
1982
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
There are numerous examples of frames, although properly designed to resist earthquake loading when acting alone, being severely damaged due to the presence of infill masonry walls acting in the plane of the frame. In this study a nonlinear dynamic model to study the behavior of frames infilled by masonry walls has been presented. The nonlinearities of the model include the interaction between the frame and wall, cracking and failure of the wall, the bracing effect that the wall has on the frame, the discontinuities between the frame and wall, and the inelastic behavior of the frame.
The fundamental concept for modeling the masonry wall was based on the premise that the cracking mechanism in the wall may be separated from the material model assumed for the masonry.
The analytical model was used to study three one story, one bay frames and a three story, one bay frame infilled with masonry walls to each of which a ground motion was applied.
The model showed the ability to represent the different facets of behavior that have been observed experimentally. Specifically, the wall was able to alter its behavior in accord with the boundary conditions imposed by the frame. It was also able to effectively represent the cracking pattern both inside and at the boundary of the wall. It also showed the ability to brace the frame both diagonally and as a short column.
The studies that were done pointed to the inadequacy of some of the most common assumptions made with regard to a frame-infill-wall system. The size of the initial separation between the frame and wall may be the principal factor in determining the behavior of the system while a combination of the initial frequency, gap size, and wall strength may be the second most important condition.
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