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Core-softened potentials, multiple liquid-liquid critical points, and density anomaly regions： An exact solution

Frontiers of physics 2018年第1期13卷 85-94页

作者： eduardo O. rizzatti Marco Aurelio A. Barbosa Marcia C. Barbosa Instituto de Fisica Universidade Federal do Rio Grande do Sul Porto Alegre-RS Brazil Programa de Pos-Graduacao em Ciencia de Materiais Universidade de Brasilia Planaltina-DF Brazil

The pressure versus temperature phase diagram of a shoulder-like potential is exactly computed in one system of particles interacting through a multiscale dimension. The N-shoulder potential exhibits N density anomaly regions in the phase diagram if the length scales can be connected by a convex curve The result is analyzed in terms of the convexity of the Gibbs free energy.

关键词： density anomalies regions

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Mechanical Behavior of Concrete Block Masonry

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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：混凝土砌块砌体力学行为压缩试验非线性特性失效模式横向应变压缩强度抗压强度

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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, and 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：陶瓷砌体砌体结构单元数值分析墙体几何尺寸几何形状应力分布

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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

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