The Effect of the Boundary Conditions on the Seismic Performance of Out-of-Plane Masonry Infill by Considering In-Plane Behavior Interaction

Document Type : Original Article

Authors

• Jalil Shafaei
• Delaram Ostad

Shahrood University of Technology, Shahrood, Iran.

10.22067/jfcei.2024.79409.1187

Abstract

The observed damage during the past earthquakes shows that the damage of the masonry infill in the in-plane and the reduction of the contact surface between the masonry infill and the surrounding frame led to an increase in the vulnerability out-of-plane. Considering the different contact conditions of the masonry infill with the surrounding concrete frame, the interaction, and influence of the out-of-plane on the in-plane behavior of the masonry infills, which is a new topic in the field of seismic performance of the masonry infills. In this paper, the effect of different boundary conditions the masonry infill and the reinforced concrete frame, which include four edges supported by the frame, three edges supported by the frame, two horizontal edges supported by the frame, and one edge supported by the frame, by analyzing three types of loading, which are: 1-out-of-plane loading only, 2-the out-of-plane loading after in-plane loading, 3-the in-plane loading after out-of-plane loading, have been evaluated by using the finite element software ABAQUS. The results demonstrated that the absence of proper connection between the frame structure and the infill increases the Out-of-plane direction vulnerability, and does not prevent their collapse. Previous damage due to in-plane loading, which reached a maximum drift of 3%, can reduce about 70% of the out-of-plane capacity of the infill frame and consequently, the strength and stiffness were affected by the boundary conditions and type loading.

Keywords

• Masonry infill
• In-plane and out-of-plane interaction
• Boundary condition
• Finite element analysis

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