Effect of partial infill walls on collapse behavior of reinforced concrete frames

The complex behavior of reinforced concrete frames with infill walls under earthquake loads requires a realistic conceptual model that recognizes changes in strength and stiffness occurring during loading. Accordingly, a new hysteresis model is developed in this article for such reinforced concrete frames to investigate the ultimate damage state given a ground motion. Using this model, the infilled frame can be represented as a single-degree-of-freedom system for computationally efficient dynamic in-plane response analysis. A backbone curve is developed first to provide an envelope within which load–displacement paths occur. Then, the load reversal effects are described and integrated into the backbone curve to obtain the hysteresis model. The hysteresis model developed in this article is checked using data from 11 laboratory experiments carried out by other researchers. The applicability of the hysteresis model is also illustrated on a laboratory specimen that was tested by other researchers under base excitation.

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Masonry infill walls in reinforced concrete frames as a source of structural damping

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.2380 ◽

2013 ◽

Vol 43 (7) ◽

pp. 949-968 ◽

Cited By ~ 15

Author(s):

H. Ozkaynak ◽

E. Yuksel ◽

C. Yalcin ◽

A. A. Dindar ◽

O. Buyukozturk

Keyword(s):

Reinforced Concrete ◽

Structural Damping ◽

Concrete Frames ◽

Reinforced Concrete Frames ◽

Infill Walls ◽

Masonry Infill ◽

Masonry Infill Walls

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Resistance of reinforced concrete frames with masonry infill walls to in-plane gravity loading due to loss of a supporting column

Engineering Structures ◽

10.1016/j.engstruct.2017.02.061 ◽

2017 ◽

Vol 140 ◽

pp. 134-150 ◽

Cited By ~ 19

Author(s):

A. Brodsky ◽

D.Z. Yankelevsky

Keyword(s):

Reinforced Concrete ◽

Concrete Frames ◽

Reinforced Concrete Frames ◽

Infill Walls ◽

Masonry Infill ◽

Masonry Infill Walls

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Seismic Performance of Nonductile Reinforced Concrete Frames with Masonry Infill Walls—II: Collapse Assessment

Earthquake Spectra ◽

10.1193/091514eqs141m ◽

2016 ◽

Vol 32 (2) ◽

pp. 819-842 ◽

Cited By ~ 10

Author(s):

Siamak Sattar ◽

Abbie B. Liel

Keyword(s):

Reinforced Concrete ◽

Los Angeles ◽

Nonlinear Models ◽

Companion Paper ◽

Concrete Frames ◽

Infill Walls ◽

Infilled Frames ◽

Beam Columns ◽

Collapse Behavior ◽

Rc Frame Buildings

This paper quantifies the collapse performance of a set of masonry-infilled reinforced concrete (RC) frame buildings that are representative of 1920s-era construction in Los Angeles, California. These buildings have solid clay-brick infill walls and vary in height (2–8 stories), wall configuration (bare, partially, and fully infilled frames), and wall thickness (1–3 wythes). The buildings’ collapse behavior is assessed through dynamic analysis of nonlinear models. These models represent the walls by diagonal struts whose properties are developed from finite-element (FE) analyses, as described in the companion paper, and represent beam-columns with lumped-plasticity models. The results indicate that the presence of infill walls can increase the risk of collapse. The most collapse prone of the buildings considered are those with strong, heavy infill walls, which induce large force demands in the frame elements. The partially infilled frames, which have a soft and weak first story, also perform poorly.

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