Backbone Model for Masonry Infill Walls in Steel Frames Based on the Governing Failure Mode


Abstract eng:
The use of infill walls as part of structural system affect strength, stiffness, dynamic response and overall seismic response of the structure. However, inappropriate arrangement of the infill walls may result in twisting when the structure subject to earthquake loading. In the current design standards, an equivalent strut model is prescribed to account for the stiffness and strength of the infills. Backbone model of the equivalent strut is defined based on a bilinear model that includes only effective parameters of infill i.e. ultimate strength and stiffness. Use of this model involves several deficiencies which include inability to track crack propagation, unrealistic behavioral compared to actual response of the infill and in some cases, inappropriate prediction of the infill behavior. In This study, the main objectives are to identify effective parameters of the frame behavior and to propose a model which accounts for influential parameters. A micro-model of the steel infill frame is first created using the ABAQUS finite element software. The parameters affecting the response of the infill frame were studied after validation of the model against experimental results. A model was then proposed by replacing the infill by an equivalent strut to overcome some of the shortcomings of the current models. The proposed model consists of initial stiffness, cracking point, secondary stiffness, maximum capacity and failure point, which are presented using a multi-linear response. The results showed that the effect of fillers on the behavior of infill frame is so significant. Response of the frame is also influenced by vertical mortar or mortars amongst beams, columns, and infill. Furthermore, the proposed multi-linear model can present a more accurate estimation of the infill behavior.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3357.:
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