Discussion of “Confined masonry walls subjected to combined axial loads and out-of-plane uniform pressures” 1Appears in the Canadian Journal of Civil Engineering, 39(4): 439–447 [doi: 10.1139/l2012-021].

2012 ◽  
Vol 39 (11) ◽  
pp. 1238-1239
Author(s):  
Huanjun Jiang ◽  
Bo Fu
Keyword(s):  
Canadian Journal ◽  
Civil Engineering ◽  
Masonry Walls ◽  
Axial Loads ◽  
Confined Masonry ◽  
Out Of Plane

Confined masonry walls subjected to combined axial loads and out-of-plane uniform pressures

2012 ◽  
Vol 39 (4) ◽  
pp. 439-447 ◽  
Author(s):  
Jorge Varela-Rivera ◽  
Manuel Polanco-May ◽  
Luis Fernandez-Baqueiro ◽  
Eric I. Moreno
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Axial Load ◽  
Analytical Models ◽  
Maximum Pressure ◽  
Masonry Walls ◽  
The Finite Element Method ◽  
Axial Loads ◽  
Confined Masonry ◽  
Out Of Plane

This paper presents the results of a study on the behavior of three full-scale confined masonry walls subjected to combined axial loads and out-of-plane uniform pressures. The variable studied was the wall axial load. Analytical models were developed to predict out-of-plane cracking and maximum pressures. The former was predicted using the finite element method and the latter using the spring-strut method. This last method was modified to include the effect of the wall axial load. Experimental cracking and maximum pressures were compared with those obtained from analytical models. Based on the experimental results, it was concluded that as the axial load increases, the out-of-plane maximum pressure also increases. However, this latter value is limited by crushing of the masonry. By comparing experimental and analytical results, it was concluded that the out-of-plane cracking and maximum pressures are in general well predicted by the analytical models developed in this work.

Bidirectional strut method: out-of-plane strength of confined masonry walls

2014 ◽  
Vol 41 (12) ◽  
pp. 1029-1035 ◽  
Author(s):  
Joel Moreno-Herrera ◽  
Jorge Varela-Rivera ◽  
Luis Fernandez-Baqueiro
Keyword(s):  
Sensitivity Analysis ◽  
Aspect Ratio ◽  
Analytical Method ◽  
Slenderness Ratio ◽  
Masonry Walls ◽  
Axial Loads ◽  
Confined Masonry ◽  
Out Of Plane ◽  
Arching Action ◽  
Compressive Strut

An analytical method to determine the out-of-plane strength of confined masonry walls is developed. The method is called the “bidirectional strut method.” Walls with and without openings subjected to combined out-of-plane and axial loads are considered. The method is based on two-way arching action. Masonry compressive strut forces are transferred eccentrically to the concrete confining elements. Flexural and torsional effects, together with the variation of displacements along these elements, are considered. Analytical strengths of confined walls are determined using this method. These strengths are compared with experimental and other analytical strengths. A sensitivity analysis of the strength is carried out considering different variables. It is concluded that the bidirectional strut method accurately predicts the strength of the walls studied. The main variables that affect the strength are the wall aspect ratio, wall slenderness ratio, and the stiffness of the confining elements.

Out-of-Plane Design Procedure for Confined Masonry Walls

2016 ◽  
Vol 142 (2) ◽  
pp. 04015126 ◽  
Author(s):  
Joel Moreno-Herrera ◽  
Jorge Varela-Rivera ◽  
Luis Fernandez-Baqueiro
Keyword(s):  
Design Procedure ◽  
Masonry Walls ◽  
Confined Masonry ◽  
Out Of Plane

Out-of-plane behavior of confined masonry walls with aspect ratios greater than one

2021 ◽  
Vol 48 (1) ◽  
pp. 89-97
Author(s):  
Jorge Varela-Rivera ◽  
Joel Moreno-Herrera ◽  
Luis Fernandez-Baqueiro ◽  
Juan Cacep-Rodriguez ◽  
Cesar Freyre-Pinto
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Compressive Stress ◽  
Masonry Walls ◽  
Confined Masonry ◽  
Aspect Ratios ◽  
Out Of Plane ◽  
Axial Compressive Stress ◽  
Compressive Strut ◽  
Failure Line

An experimental study on the out-of-plane behavior of confined masonry walls is presented. Four confined walls with aspect ratios greater than one were tested in the laboratory. Walls were subjected to combined axial and out-of-plane uniform loads. The variables studied were the aspect ratio and the axial compressive stress of walls. It was observed that the out-of-plane strength of walls increased as the aspect ratio or the axial compressive stress increased. Failure of walls was associated with crushing of masonry. Analytical out-of-plane strength of walls was determined using the yielding line, failure line, modified yielding line, compressive strut and bidirectional strut methods. It was concluded that the experimental out-of-plane strength of walls was best predicted with the bidirectional strut method.

Out-Of-Plane Behavior of Confined Masonry Walls Subjected to Concentrated Loads (One-Way Bending)

2016 ◽  
Vol 32 (4) ◽  
pp. 2317-2335 ◽  
Author(s):  
Dante Navarrete-Macias ◽  
Jorge Varela-Rivera ◽  
Luis Fernandez-Baqueiro
Keyword(s):  
Aspect Ratio ◽  
Seismic Behavior ◽  
Axial Stress ◽  
Experimental Results ◽  
Masonry Walls ◽  
Cyclic Loads ◽  
Wall Panel ◽  
Confined Masonry ◽  
Plastic Analysis ◽  
Out Of Plane

This paper presents the results of a study on the out-of-plane seismic behavior of confined masonry walls. Five confined walls were tested under reverse cyclic loads. The variables studied were the axial stress and the wall aspect ratio. Analytical out-of-plane strength of walls was calculated considering the strengths of the wall panel and the concrete confining elements. The former was determined using the unidirectional strut method and the latter using a plastic analysis. It was observed that for walls with the same aspect ratio, as the axial stress increases, the out-of-plane strength increases. For walls with the same axial stress, as the aspect ratio increases, the strength decreases. Based on comparisons between analytical and experimental results, it was concluded that the models developed in this work predict accurately the out-of-plane strength of the walls.

Out-of-Plane Strength of Confined Masonry Walls

2012 ◽  
Vol 138 (11) ◽  
pp. 1331-1341 ◽  
Author(s):  
Jorge Varela-Rivera ◽  
Joel Moreno-Herrera ◽  
Ivan Lopez-Gutierrez ◽  
Luis Fernandez-Baqueiro
Keyword(s):  
Masonry Walls ◽  
Confined Masonry ◽  
Out Of Plane

Behavior of Confined Masonry Walls with Openings under In-Plane and Out-of-Plane Loads

2018 ◽  
Vol 34 (2) ◽  
pp. 817-841 ◽  
Author(s):  
Vaibhav Singhal ◽  
Durgesh C. Rai
Keyword(s):  
Structural Integrity ◽  
Solid Wall ◽  
Ground Motions ◽  
Masonry Walls ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Severe Damage ◽  
Confined Masonry ◽  
Load Carrying ◽  
Out Of Plane

Six half-scaled wall panels were tested to investigate the effect of openings on their load-carrying capacity; these walls were subjected to a sequence of slow cyclic in-plane drifts and shake table–generated out-of-plane ground motions. Two specimens were masonry-infilled frames with and without openings. The other four specimens were confined-masonry (CM) walls, with one solid wall and three walls with openings bounded by reinforced-concrete (RC) confining elements on all sides. The infill walls demonstrated higher risk of out-of-plane collapse, whereas the CM walls maintained structural integrity and out-of-plane stability. The test results clearly indicate the necessity of confinement all around the openings for good seismic performance. The confining scheme with no continuous horizontal bands was ineffective in confining wall piers at large drifts, and piers remain vulnerable to out-of-plane collapse due to severe damage. However, the wall with continuous horizontal bands at the lintel and sill levels was not only able to compensate for deficiencies in strength due to the presence of openings, but also achieved a better overall behavior due to more distributed damage and greater ductility.

Out-of-plane behaviour of confined masonry walls

2011 ◽  
Vol 33 (5) ◽  
pp. 1734-1741 ◽  
Author(s):  
J.L. Varela-Rivera ◽  
D. Navarrete-Macias ◽  
L.E. Fernandez-Baqueiro ◽  
E.I. Moreno
Keyword(s):  
Masonry Walls ◽  
Confined Masonry ◽  
Out Of Plane
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