Distribution of Stresses in Masonry Pillar with Fully Filled and Unfilled Perpend Joints

2016 ◽  
Vol 249 ◽  
pp. 160-165 ◽  
Author(s):  
Petr Bílý ◽  
Josef Fládr
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Numerical Analysis ◽  
Shear Walls ◽  
Load Resistance ◽  
Masonry Structures ◽  
Vertical Load ◽  
Fem Model ◽  
The Czech Republic ◽  
Distribution Of Stresses

The paper summarizes the results of numerical analysis conducted with the aim to compare the distribution of stresses in masonry pillars constructed using different bricklaying techniques. The analysis was carried out in reaction to the discussion of members of Czech standardization committee TNK 37 – Masonry structures. Currently, most of masonry load-bearing structures in the Czech Republic are made from clay blocks without mortar in perpend joints. The analysis seeks the answer to the question whether it is possible, in case of the eccentrically loaded masonry pillars with unfilled perpend joints, to consider the value of design compressive strength calculated using the same approach as for pillars with filled perpend joints for the check of vertical load resistance. Supplementary comparison of the behavior of the pillars with filled and unfilled perpend joints loaded by lateral load in the plane of the pillar (corresponding to short shear walls) was also conducted. 2D FEM model created in ATENA Science software was exploited for the analysis. The results confirmed that the approaches contained in ČSN EN 1996-1-1 [1] are basically applicable for pillars with unfilled perpend joints.

Study of Properties of Concrete for Water-Tight Tunnel Lining

2015 ◽  
Vol 1106 ◽  
pp. 17-20 ◽  
Author(s):  
Adam Hubáček ◽  
Tomáš Jarolím ◽  
Petra Macháňová
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Fresh Concrete ◽  
Concrete Structures ◽  
Tunnel Lining ◽  
Hardened Concrete ◽  
The Czech Republic ◽  
Water Durability ◽  
Pressure Water

The paper deals with the topic of concrete for water-tight tunnel lining. This theme is currently very topical both in the Czech Republic and abroad. The focus is on requirements and properties of fresh concrete for manufacture of these specific concrete structures. Properties of hardened concrete will be examined, too: compressive strength, resistance to pressure water, durability and other parameters.

scholarly journals Prerequisites for Increasing the Axle Load on Railway Tracks in the Czech Republic

10.14311/1063 ◽  
2008 ◽  
Vol 48 (6) ◽  
Author(s):  
M. Lidmila ◽  
L. Horníček ◽  
H. Krejčiříková ◽  
P. Tyc
Keyword(s):  
Czech Republic ◽  
Numerical Analysis ◽  
Experimental Measurements ◽  
The Czech Republic ◽  
Railway Tracks ◽  
Axle Loads

This paper deals with problems of increasing the axle load on Czech Railways (ED) tracks to 250 kN or 300 kN, respectively. The results of a numerical analysis of the effects of increased axle loads on the track bed structure were verified by experimental measurements carried out on track bed construction models in an experimental box on a 1:1 scale. The results of the research are applicable for routine use on ED. 

scholarly journals Using GIS to detect neotectonics in the Vsetínské vrchy Mountains and in their surroundings

Geografie ◽  
2003 ◽  
Vol 108 (2) ◽  
pp. 101-114
Author(s):  
Michal Bíl
Keyword(s):  
Czech Republic ◽  
Numerical Analysis ◽  
Large Scale ◽  
Dynamic Equilibrium ◽  
Large Area ◽  
The Czech Republic ◽  
Geological Maps ◽  
Bedrock Geology ◽  
Steep Slopes ◽  
Topographic Relief

This paper discusses the advantages of GIS and numerical analysis in neotectonic studies. An accurate DEM is important for numerous geomorphic and hydrologic applications, particularly over large areas. The method is illustrated on the DEM of the Vsetínské vrchy Mountains, a 367 square km large area in the east of the Czech Republic. Comparing geological maps with large-scale morphometry shows a relationship between the rock resistance and topography. On average, higher mean elevations and steep slopes correlate well with regions of hard bedrock geology. The results together with new geological and geophysical findings show that the evolution of this part of the Outer Western Carpathian topography was proceeding continually. There is no reason to assume the presence of any periods of tectonic standstill here. The topographic relief probably has experienced the state of dynamic equilibrium.

scholarly journals Comparative Study On Load Resistance of Eco-Friendly Interlocking Blocks For Sustainable Construction

2021 ◽  
Author(s):  
Venkata Veera Himakar Chunduri ◽  
Veerendrakumar C. Khed
Keyword(s):  
Compressive Strength ◽  
Environmental Sustainability ◽  
Load Resistance ◽  
Masonry Wall ◽  
Sustainable Construction ◽  
Bottom Surface ◽  
Brick Wall ◽  
Vertical Load ◽  
Block Wall ◽  
Wall Construction

Abstract The rapid growth of contemporary construction industry has driven engineers to explore new construction techniques for sustainable development. Interlocking block wall construction reduces time, labour and enhances construction efficiency compared to conventional masonry wall construction. The interlocking pattern has been applied to the top and bottom surface of block to withstand gravity and lateral loads whereas current interlocking blocks only serve the purpose of easy alignment. In this study, eco-friendly blocks have been developed with industrial waste such as fly ash, quarry dust and geopolymer as binder. Tests to evaluate the compressive strength, water absorption and efflorescence have been carried out on both traditional and geopolymer interlocking blocks. Later, on two blocks joint, in-plane vertical load has been applied and the same model is generated to validate the failure. Using numerical modelling, horizontal and vertical load resistance of interlocking block wall and traditional brick wall was compared. The experimental results show that, relative to traditional clay brick, the compressive strength of the geopolymer interlocking block was high but the absorption of water was low. The vertical load resistance is identical but horizontal load resistance was high in interlocking block wall. The interlocking geopolymer block was the best approach for environmental sustainability.

Systems and Regulations for Design and Application of Water-Tight Concrete Structures

2018 ◽  
Vol 272 ◽  
pp. 203-208
Author(s):  
Adam Hubáček
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Concrete Structure ◽  
Fresh Concrete ◽  
Concrete Structures ◽  
Hardened Concrete ◽  
Self Compacting Concrete ◽  
The Czech Republic ◽  
Pressure Water ◽  
Design And Application

The paper focuses on the problems of concrete for water-tight concrete structure and with systém and regulations for design and application of these structures. The theme is currently quite topical in the Czech Republic and abroad. The accent is put particularly on the requirements and properties of fresh concrete or self-compacting concrete for manufacture of specific concrete structures. Properties of hardened concrete will be also observed; in particular compressive strength, resistance to pressure water, durability and other parameters.

Concrete with High Content of Fly Ash Intended for Constructions with Long Durability

2016 ◽  
Vol 249 ◽  
pp. 21-27 ◽  
Author(s):  
Adam Hubáček ◽  
Rudolf Hela
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Fly Ash ◽  
Fresh Concrete ◽  
Ash Content ◽  
Hardened Concrete ◽  
The Czech Republic ◽  
Concrete Properties ◽  
Pressure Water ◽  
Long Life

The article deals with theme of high fly ash content concretes intended for long life constructions. Considering the still growing consumption of fly ash in construction concretes it is a live theme in the Czech Republic and abroad as well. The emphasis will be laid namely on characteristics and requirements for fresh concrete intended for construction of these specific concrete constructions. They are for instance waterproof constructions, tunnel linings, concretes for bridge and road constructions etc. Also the hardened concrete properties like compressive strength, resistance to pressure water, durability and further necessary parameters for obtainment of required properties of these concretes will be monitored.

Problems of Watertight Concrete for the Concrete Tunnel Lining

2014 ◽  
Vol 1000 ◽  
pp. 360-364
Author(s):  
Adam Hubáček
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Fresh Concrete ◽  
Concrete Structures ◽  
Tunnel Lining ◽  
Hardened Concrete ◽  
Self Compacting Concrete ◽  
The Czech Republic ◽  
Water Durability ◽  
Pressure Water

The paper focuses on the problems of concrete for watertight tunnel lining. The theme is currently quite topical in the Czech Republic and abroad. The accent is put particularly on the requirements and properties of fresh concrete or self-compacting concrete for manufacture of specific concrete structures. Properties of hardened concrete will be also observed; in particular compressive strength, resistance to pressure water, durability and other parameters.

Water-Tight Concrete Constructions and Directives for their Design and Realization

2017 ◽  
Vol 908 ◽  
pp. 154-158
Author(s):  
Adam Hubáček ◽  
Iveta Hájková
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Experimental Work ◽  
Frost Resistance ◽  
Crack Formation ◽  
Current Knowledge ◽  
Laboratory Work ◽  
The Czech Republic ◽  
Early Stages ◽  
Heat Development

The paper describes problems of water-tight concrete constructions, their design, manufacture and testing of quality in accordance with regulations and directives used in the Czech Republic and abroad. Current knowledge of water-tight constructions and water-tight concrete imply that main focus is on problems of use of water-tight concrete for construction of so-called white bath and preventing crack formation in concrete. Laboratory work is focused mainly on design of concrete based on individual regulations. Subsequently, influence of various types of cement and additions partly replacing cement on properties of water-tight concrete is examined. Research of heat development during hydration at early stages of maturing is and inseparable part of the experimental work, as well as development of compressive strength, water-tightness and frost resistance of concrete

Study of the Mechanical Properties Development of Concrete Containing Fine Recycled Aggregate

2016 ◽  
Vol 827 ◽  
pp. 267-270 ◽  
Author(s):  
Magdaléna Šefflová ◽  
Tereza Pavlů
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Czech Republic ◽  
Recycled Aggregate ◽  
Future Research ◽  
Building Structures ◽  
Replacement Ratio ◽  
The Czech Republic ◽  
Concrete Mixtures ◽  
Concrete Properties

This paper is focused on the mechanical properties development of fine recycled aggregate (FRA) concrete. FRA was obtained from recycling plant in the Czech Republic. There were prepared four concrete mixtures in the laboratory. The first mixture was reference (REF) with fine natural aggregate (FNA). FNA was replaced in concrete mixtures R10, R20 and R30 in varying replacement ratio. The concrete mixtures R10, R20 and R30 contained 10 %, 20 % and 30 % FRA. There were tested properties of concrete. Finally, it is possible to say that the use of the FRA in concrete influences concrete properties. It is necessary to verify of probably an improvement of compressive strength of FRA concrete in future research. However, FRA concrete is possible to be used in the manufacturing of building structures, but it is necessary to test durability and lifespan of FRA concrete.

Problems with Variability in Using Fly Ash in Mixed Cement

2014 ◽  
Vol 969 ◽  
pp. 308-311
Author(s):  
Ondřej Zobal ◽  
Pavel Padevět ◽  
Vít Šmilauer ◽  
Zdeněk Bittnar
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Fly Ash ◽  
Water Absorption ◽  
Direct Effect ◽  
High Variability ◽  
Cement Clinker ◽  
The Czech Republic

The use of fly ash as a substitute for cement clinker brings some benefits, but also problems. One of the biggest problems of using fly ash in general is its high variability. This paper is dedicated not only to the variability of fly ash in the Czech Republic, but the issue of different water absorption of fly ash is described here as well. In addition, one of the options for coping with variability is stated here. If we follow one of the main indicators for sorting fly ash, which is the grading curve, we can optimize the use of ash produced. Based on grading curves, the mixing of various ash fractions was optimized with regard to the porosity of the mixture. Porosity has a direct effect on the compressive strength of the resulting material. This optimization will subsequently be verified experimentally.

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