Experimental and Analytical Study of Masonry Constructions Reinforced with Bed Joints

Mehmet Kamanli; Mustafa Tolga Cogurcu

doi:10.3139/120.110618

Article

Experimental and Analytical Study of Masonry Constructions Reinforced with Bed Joints

Mehmet Kamanli and Mustafa Tolga Cogurcu

Published/Copyright: September 28, 2014

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From the journal Materials Testing Volume 56 Issue 9

Abstract

In this study, investigation was conducted on the out-of-plane fracture under repeated reversing loads of specimens of unreinforced masonry wall models, a suitable building material found worldwide, strengthened by bed joints using FRP (fiberglass reinforced plastic) with epoxy resin, by production of two separate wall samples composed of materials with identical characteristics in a 1 : 1 ratio. It was also observed that the fracture type became brittle and the pour lines indicated that it did not have tensile strength. Approximately, a 3.5 increase in withstanding breakage under seismic forces was observed in the performance of the wall strengthened by FRP with epoxy reinforcements in the bed joints. Furthermore, the shear strength of the model masonry wall was 48 % less than that attained in the wall strengthened by bed joints and it was determined that the energy absorption of the model masonry wall was 22 % less than that of the wall strengthened by bed joints. Additionally, while the masonry wall in the test which was not strengthened broke under repeated reversing loads at 65 kN, the break load of the strengthened masonry wall was ascertained to be 80 kN. The accuracy and application of the results of the studies conducted were also scrutinized by running finite element stress analysis and numerical solutions using an ANSYS computer-supported analysis program.

Kurzfassung

In der diesem Beitrag zugrundeliegenden Studie wurde der aus der Ebene liegende Bruch unter wiederholten umgekehrten Beanspruchungen untersucht, und zwar mittels Proben von nicht verstärkten Mauerwerksmodellen, indem ein geeignetes weltweit zu findendes Baumaterial verwendet wurde und die Lagerfugen mit glasfaserverstärktem Plastik (FRP – fiberglass reinforced plastic) und Epoxidharz verstärkt wurden. Zwei getrennte Wandproben aus Materialien mit identischen Eigenschaften wurden im Maßstab 1 : 1 hergestellt. Bei diesen beiden Wandproben aus unverstärktem Mauerwerk wurden alle drei Ziegelreihen mit einer Lagerfuge aus FRP mit Epoxidharz verstärkt und unter wiederholten umgekehrten aus der Ebene liegenden Beanspruchungen getestet, die entsprechend der Auswirkungen eines Erdbebens modelliert wurden. Danach wurde das mechanische Verhalten in Bezug auf die Bruchlast und der Bruchstelle, das Bruchverhalten, die Scherfestigkeit, die Energieabsorption und die Bruchmuster experimentell und analytisch verglichen. Es wurde beobachtet, dass die gemauerten Wände, die wiederholten umgekehrt beansprucht geprüft wurden, dann brachen, falls sie analoge Bruchlinien entlang der Gusslinien ausbildeten, die entstanden, als der verstärkte Beton gegossen wurde. Es wurde auch festgestellt, dass der Bruch spröde wurde und die Gusslinie wies darauf hin, dass dort keine Zugfestigkeit bestand. Für die mittels FRP mit Epoxidharz in den Lagerfugen verstärkte Wand wurde ungefähr ein 3,5-facher Anstieg des Widerstandes gegen Bruch unter seismischen Kräften beobachtet. Darüber hinaus waren die Scherfestigkeit des Modell-Mauerwerks 48 % und die Energieabsorption 22 % geringer als die, die sich für die in den Lagerfugen verstärkte Wand ergab. Außerdem brach die nicht verstärkte Mauerwerkswand im Test unter wiederholten umgekehrten Lasten von 65 kN, während die Bruchlast der verstärkten Wand 80 kN betrug. Die Genauigkeit und die Anwendung der Ergebnisse der Studie wurden zudem eingehend mittels Finite Elemente Analyse unter Verwendung des Programms ANSYS geprüft.

*Correspondence Address Mustafa Tolga Cogurcu Selcuk University Faculty of Engineering Department of Civil Engineering Konya, Turkey E-mail: mtolgac@selcuk.edu.tr

Dr. Mehmet Kaminli is Assist. Prof. in the Department of Civil Engineering, Engineering and Architecture Faculty at Selcuk University, Konya, Turkey. He received his BSc and PhD in civil engineering from Selcuk University, in 2001, respectively. His research interests include computer-aided design, reinforcement of concrete, and computer graphics.

Dr. Mustafa Tolga Cogurcu is Assist. Prof. in the Department of Civil Engineering, Engineering and Architecture Faculty at Selcuk University, Konya, Turkey. He received his BSc and PhD in civil engineering from Selcuk University, in 2007, respectively. His research interests include computer-aided design, reinforcement of concrete, and masonry structures.

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Published Online: 2014-09-28

Published in Print: 2014-09-01

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https://doi.org/10.3139/120.110618