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Mechanical Behavior of Concrete Block Masonry

Journal of Civil Engineering and Architecture 2012年第10期6卷 1354-1361页

作者： gihad mohamad Eduardo Rizzatti Paulo Brandao Lourenco Humberto Ramos Roman Technology Center Structural and Building Department Federal University of Santa Maria Santa Maria-RS 97105-900 Brasil Civil Engineering Department University of Minho Guimaraes 4800-058 Portugal Civil Engineering Department Federal University of Santa Catarina Florian6polis 88040-900 Brasil

The main objective of this study is to verify, through compression tests on different prisms, the vertical and horizontal deformability and the failure modes of the components of concrete blocks under compression. In this study two mortar mixes were tested, along with two types of prism, with and without the presence of a vertical joint. The conclusions were： the appearance of non-linearities of the masonry corresponds to an increase in the lateral strain due to extensive cracking of the material and a progressive increase in the Poisson ratio, the cracks in the three-block prisms built with the mortar type I were vertical, occurring symmetrically on both sides; the prisms built with mortar type II had, as a consequence of localized crushing, an association with vertical cracks due to the concentrations of stresses at some points, the presence of a vertical joint led to the appearance of separation cracks between the middle block and the vertical mortar joint, when the stress reached approximately 30% of the compressive strength of the set; the prisms with two whole blocks and one vertical joint （B） built with the mortars of mixes I and II had a compressive strength of the order of 42% and 66% of the prisms with three whole blocks （A）, respectively.

关键词： Masonry concrete block prisms failure vertical joint

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Numerical Analysis of the Influence of Geometry of Ceramic Units （Blocks） on Structural Walls

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Journal of Civil Engineering and Architecture 2016年第1期10卷 44-52页

作者： gihad mohamad Eduardo Rizzatti Humberto Roman Gerson M. S. Alva Andre Lubeck Structural and Building Construction Department Federal University of Santa Maria Santa Maria 97105-900 Brazil Building Construction Department Federal University of Santa Catarina Santa Maria 97105-900 Brazil Civil Engineering College Federal University of Uberlandia Uberldndia 38414-172 Brazil Civil Engineering College Federal University of Pampa Alegrete 97546-550 RS Brazil

This paper presents finite element results of ceramic masonry prisms and walls under concentric compression. Four different hole geometries of ceramic units were studied （called Types A, B, C and D）. The A-type unit had two rectangular hollows, B-type and C-type units have two rounded hollows and different net areas, mad the D-type unit had two rectangular hollows and a double central web. This study analyzed units, prisms and structural walls joined by bedding mortar. The objective was to verify the stress distribution in units and mortars. The results showed that the distribution of compressive stress along the length and width of those units was uniform, but lateral tensile stress along the length was distinct for different geometries. In addition, this study observed that hollow shapes have an important influence in stress distribution. The D-type unit was the one that showed more uniform tension distribution, without peaks of stress concentration. This indicates that a D-type unit is the most efficient unit for use in masonry structures.

关键词： Ceramic units structural masonry geometry.

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Experimental Analysis of Mechanical Behavior of Lintels with Murfor Reinforcement in Structural Masonry

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Journal of Civil Engineering and Architecture 2014年第5期8卷 573-580页

作者： Fabiana Rezende gihad mohamad Eduardo Rizzatti Larissa D. Kirchhof Elizabete Y.N. Bavastri Department of Structural and Building Construction Federal University of Santa Maria Rio Grande do Su197010-300 Brazil Department of Civil Engineering Federal Technological University of Parana Parana 80215-901 Brazil

The main goal of this study is analysis the mechanical behavior, failure mode and deflections of masonry beams lintels when subjected to concentrated loading. Walls were built using hollow clay blocks, using horizontal reinforcement on bed joint, and using of Murfor steel reinforcement. The conclusions of this work was： at middle of span, the load and displacement results present a linear behavior until failure; there two regions of failure, the region ＂A＂ presents the association of crushing and the region ＂B＂ shows the shear stress between block and mortar; the visual analysis of experimental tests shows the lost of adhesion between the mortar joint and blocks. It was not observed cracks on the mid-span produced by bending; it is possible to detach that the use of plane truss in Brazil as technological alternative is feasible and makes the masonry walls execution more rational, increasing the velocity of production.

关键词： Structural masonry clay block lintel Murfor reinforcement masonry.

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