Stress–strain characteristics of brick masonry under compressive cyclic loading

This paper presents the results of laboratory experiments carried out on twelve clay brick masonry wallettes of two types under cyclic compressive loading. In the paper, the procedure adapted for testing is described and the results are discussed. The failure models and cracking patterns of the tested specimens are presented. The effects of the repeated load on the behaviour and mechanical properties of the wall are observed and discussed. Based on the results, the analytical formula for the determination of the failure envelope curve is also proposed

Investigations on Flexural and Compressive Strengths of Mortar Dedicated to Clinker Units—Influence of Mixing Water Content and Curing Time

The article presents laboratory tests on the impact of the mixing water content used in the preparation of fresh mortar on the flexural and compressive strength of one of the dry-mix mortars produced by a leading European producer and dedicated to bricklaying with clinker elements. The development of these parameters in relation to curing time was also analyzed. The mortar samples were prepared from a factory-made mortar mix using 4.0 L (the value recommended by the mortar manufacturer), 4.5 L, and 5 L of water per 25 kg bag of ready-made, pre-mixed dry mortar mix. All samples were tested in five series after 5, 9, 14, 21, and 28 days of sample curing. The results of these tests showed that the use of 6 and 18% more mixing water than recommended by the manufacturer (4.5 and 5 L per bag) adversely affected the basic mechanical parameters of the tested mortar. Moreover, it was found that the highest compressive strength values were obtained after 21 days of curing and not after 28 days as usual. It was also found that hardening time and higher than recommended water content adversely affected the bending strength of the mortar

Joints in walls

W artykule zostały przedstawione wyniki badań własnych połączeń ścian wykonanych z autoklawizowanego betonu komórkowego. Badania przeprowadzono na autorskim, zmodyfikowanym stanowisku badawczym. Łącznie przebadano trzy serie murów po trzy elementy badawcze. Ponadto zaprezentowano ustalenia normowe w zakresie, jakim jest łączenie ścian murowanych, a także przedstawiono podstawowy dostępny na rynku asortyment służący do łączenia ścian.The issue of joints in masonry walls is not well investigated. There is very little experimental research performed on this matter and the test results are hard to be compared because of a lack of unifieded testing schemes and procedures. Hence, the authors performed own tests of joints in walls made of the AAC – the most popular masonry element – with the use of steel connectors

Łączenie ścian. Cz.1

W niniejszym artykule zebrano informacje odnośnie do wymogów normowych, procedur obliczeniowych, zaleceń producentów, a także wyników i wniosków z badań doświadczalnych prowadzonych na świecie w temacie dotyczącym zagadnienia połączeń ścian

Finite Element Study on the Shear Capacity of Traditional Joints between Walls Made of AAC Masonry Units

This paper presents the development of a numerical model aimed at the simulation of nonlinear behaviour of traditional joints between walls made of autoclaved aerated concrete (AAC) masonry units. Nonlinear behaviour and cracking of AAC and mortar were simulated using the concrete damaged plasticity (CDP) model available in the ABAQUS finite element software. The paper also presents and discusses the results of an experimental campaign involving testing six T-shaped, monosymmetric samples with traditional joints between walls loaded in shear. The results were used to validate the numerical model. The validation confirmed that the model is capable of producing accurate results and predicting the structural behaviour with a reasonably good accuracy in elastic and post-elastic stages. Furthermore, a sensitivity study was conducted, in which the variation of elastic modulus, Poisson’s ratio, tensile strength, compression strength and fracture energy of AAC was investigated. Results showed that the variation of elastic modulus, tensile strength and fracture energy is most critical to the structural behaviour of the model, while variation of the remaining parameters has a negligible effect on the results

Study on the Mechanical Properties of Two General-Purpose Cement–Lime Mortars Prepared Based on Air Lime

It is believed that the use of mortars based on air lime in the construction and renovation of brick buildings has a number of advantages, especially those closely related to the durability and strength of the structure. However, there is still a noticeable difference in the mechanical properties of these materials. This research investigated the mechanical characteristics of a mixed cement–lime mortar with the two most popular proportions of an air lime, cement, and sand mix: 1:1:6 and 1:2:9 (by volume). Mechanical tests were performed on standard and non-standard samples to assess compressive strength, tensile strength, flexural strength, and fracture energy. The obtained results indicate the possibility of using these mixtures in modern masonry construction, as well as in the aspect of sustainable development. Additionally, lime mortar with a higher lime content can be used in non-load-bearing walls and in renovation and repair works

Konstrukcje żelbetowe według Eurokodu 2 : atlas rysunków

Na stronie tytułowej: Nowe wydanie.Druk dwuszpaltowy.Bibliografia przy rozdziałach.Wyd. 2 zm. - dodr. 3, wyd. noweXI, [1], 225 str. : ilustracjeWarszawahttp://www.biblos.pk.edu.pl/ST/2018/12/100000319212/100000319212_Zybura_KonstrukcjeZelbetoweWedlug.pdfpodręcznikwersja wydawnicz