scholarly journals FIRE RESISTANCE FOR THIN-WEBBED CONCRETE AND MASONRY ELEMENTS

2016 ◽  
Author(s):  
György L. Balázs ◽  
Éva Lublóy
Keyword(s):  
Experimental Study ◽  
High Temperatures ◽  
Fire Resistance ◽  
Material Composition ◽  
Structural Performance ◽  
Temperature History ◽  
Fire Tests ◽  
Structural Elements ◽  
Structural Behaviour ◽  
Simultaneous Application

<p>Deterioration of material characteristics and structural performance highly depends on constituents and temperature history. Material composition can also highly influence structural behaviour of elements. Thickness of web can be critical for high temperatures. The same situation is for interjoist elements (concrete or brick) between precast roof girders.</p>First part of our study was to improve fire resistance by structural elements with a typical thin web. Our experimental study included fire tests on various concrete mixes and fire tests of the girder with simultaneous application of load. Second part of our study was to summarize the result of real fire cases for girder-slab systems with concrete or brick interjoists.

scholarly journals Experimental Study on Two-Hour Fire Resistance Performance of Slabs in Modular Buildings under Loads

2021 ◽  
Vol 21 (2) ◽  
pp. 15-21
Author(s):  
Seung-Mun Son ◽  
Jae-Sung Lee ◽  
Ok-Pin Na
Keyword(s):  
Experimental Study ◽  
North America ◽  
Fire Resistance ◽  
Mineral Wool ◽  
Glass Wool ◽  
Structural Elements ◽  
Performance Requirement ◽  
Modular Buildings ◽  
Resistance Performance ◽  
Rapid Deformation

For a floor of a building with no less than four stories and no more than twelve stories, the two-hour fire resistance performance should be satisfied. In the case of slabs with steel studs, no two-hour fire resistance performance has been proposed in Korea. In this study, the two-hour fire resistance performance of slabs with steel studs performing as structural elements of modular buildings was evaluated. These specimens were redesigned based on the typical slab used in Europe and North America by modifying the 45 mm fire-resistant board to achieve two-hour fire resistance. The experimental results showed that the FR-001 specimens with 140 mm mineral wool applied to the lower slab and the FR-002 specimens containing 100 mm lower-slab glass wool and 150 mm upper-slab mineral wool did not satisfy the two-hour fire resistance performance, owing to the rapid deformation of the specimens after 75 and 110 min, respectively. However, the FR-003 specimens containing 100 mm glass wool, 150 mm mineral wool in the upper slab, and concrete in the slab satisfied the two-hour fire resistance performance requirement.

Fibre Cocktail to Improve Fire Resistance

2016 ◽  
Vol 711 ◽  
pp. 480-487
Author(s):  
György L. Balázs ◽  
Olivér Czoboly
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
High Temperatures ◽  
Fire Resistance ◽  
Fibre Reinforced Concrete ◽  
Cellulose Fibres ◽  
Cold State

Favourable experience with fibre reinforced concrete (FRC) resulted in its increasing use worldwide. The properties of fibre reinforced concrete are mostly influenced by the type and the amount of fibres. Our experimental study was directed to the possible improvements of the residual flexural strength and the properties of concrete exposed to high temperatures with different fibre cocktails including steel, micro polymer or cellulose fibres. The influence of type and amount of fibres on residual flexural strength in cold state were tested after 300, 500 or 800 °C temperature loading.

scholarly journals New fire retardant compositions for fire-resistant automatic curtains

2018 ◽  
Vol 245 ◽  
pp. 11004 ◽  
Author(s):  
Maria Nikitina ◽  
Andrey Ustinov ◽  
Viktoria Kiseleva ◽  
Igor Babikov
Keyword(s):  
High Temperatures ◽  
Fire Resistance ◽  
Fire Retardant ◽  
Operating Parameters ◽  
Fire Tests ◽  
Protective Properties ◽  
Accredited Laboratory ◽  
Swelling Coefficient ◽  
In Fire ◽  
Effective Contribution

The paper overviews the way by which intumescent fire retardant compositions act as fillers in fire-resistant automatic curtains. A several intumescent compositions, which form a heat-isolating charred layer when they are exposed to high temperatures, were produced and applied to the mineral-fabric basis of the curtain. Fire-protective properties of produced materials were assessed and compared with foreign specimens. Swelling coefficient and material’s fire durability were considered as operating parameters. The developed specimen which performed the best during fire tests was sent to accredited laboratory. It was proven, using standardized methods, that it’s fire resistance limit reaches 30 minutes. This proves an effective contribution of an intumescent compound and opens new ways of using them in fire curtains manufacturing.

scholarly journals Experimental Study of Straw-Based Eco-Panel Using a Small Ignition Initiator

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1344
Author(s):  
Linda Makovicka Osvaldova ◽  
Iveta Markova ◽  
Stanislav Jochim ◽  
Jan Bares
Keyword(s):  
Experimental Study ◽  
Mass Loss ◽  
Fire Resistance ◽  
Significant Influence ◽  
Flame Retardancy ◽  
Fire Tests ◽  
Secondary Product ◽  
Building Insulation ◽  
Natural Cellulose ◽  
Insulating Properties

Straw, a natural cellulose-based material, has become part of building elements. Eco-panels, compressed straw in a cardboard casing, is used as building insulation. Eco-panel is a secondary product with excellent insulating properties. If suitably fire-treated (insulation and covering), straw panels’ fire resistance may be increased. This contribution deals with monitoring the behavior of eco-panels exposed to a small ignition initiator (flame). The samples consisted of compressed straw boards coated with a 40 mm thick cardboard. Samples were exposed to a flame for 5 and 10 min. The influence of the selected factors (size of the board, orientation of flame with the sample) were compared on the basis of experimentally obtained data: mass loss. The results obtained do not show a statistically significant influence of the position of the sample and the initiating source (flame). The results presented in the article confirm the justifiability of fire tests. As the results of the experiments prove, the position of a small burner for igniting such material is also important. Such weakness of the material can also be eliminated by design solutions in the construction. The experiment on larger samples also confirmed the justifiability of fire tests along with the need for flame retardancy of such material for its safe application in construction.

Experimental Study on Fire Resistance Properties of Post-Installed Rebar Connection

2013 ◽  
Vol 671-674 ◽  
pp. 1877-1882 ◽  
Author(s):  
Xin Wang ◽  
Chang Jiu Jiang ◽  
Kao Zhong Zhao ◽  
Xiang Rui Chen
Keyword(s):  
Experimental Study ◽  
Fire Resistance ◽  
Great Influence ◽  
Fire Tests ◽  
Test Results ◽  
Whole Process ◽  
Fire Endurance ◽  
Organic Adhesive

A serial of fire tests have been conducted to study the fire resistance of the post-installed rebar connection with organic adhesive. Research variables include three kinds of anchorage depth. Loads are applied to specimens through lever and remain a constant throughout the whole process of the tests. The temperatures of connections are elevated following the ISO834 curve and the failure is controlled by excessive deflection of bonded-in rebar beams. The test results show that anchorage depth has a great influence on the performance of bonded-in rebar beams exposed to fire. Beams using organic adhesive fail suddenly with obvious rebar slip, and behave with poor fire endurance.

scholarly journals AN EXPERIMENTAL STUDY ON REPAIRABILITY AND RECOVERY OF STRUCTURAL PERFORMANCE FOR DAMAGED H-SHAPED STEEL MEMBERS

2014 ◽  
Vol 20 (44) ◽  
pp. 139-142
Author(s):  
Takeshi MATSUMOTO ◽  
Kenjiro MORI ◽  
Takumi ITO ◽  
Changhoon CHOI
Keyword(s):  
Experimental Study ◽  
Structural Performance ◽  
Steel Members

Study on the Data-Bases for Fire Engineering Design of Structural Steels Members

2012 ◽  
Vol 628 ◽  
pp. 156-160
Author(s):  
In Kyu Kwon ◽  
Hyung Jun Kim ◽  
Heung Youl Kim ◽  
Bum Yean Cho ◽  
Kyung Suk Cho
Keyword(s):  
Bearing Capacity ◽  
Fire Resistance ◽  
Engineering Method ◽  
Fire Tests ◽  
Structural Members ◽  
Data Bases ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
In Fire ◽  
Resistance Performance

Structural steel has been used since the early 1970’s in Korea as primary structural members such as columns, beams, and trusses. The materials have much higher strength such as fast construction, high load bearing capacity, high construction quality but those have a fatal weakness as well. Load-bearing capacity is going down when the structural members are contained in fire condition. Therefore, to protect the structural members made of steels from the heat energy the fire resistance performance required. Generally, the fire resistance performance have evaluated from the exact fire tests in fire furnaces. But the evaluation method takes much more time and higher expenses so, the engineering method requires. The engineering method not only adopts a science but also an engineering experience. In this paper, to make various data-bases for evaluation of structural members such as columns(H-section, RHS), beams, loaded fire tests were conducted and derived not only each limiting temperature but also fire resistance respectively.

Structural Performance of Pultruded Composites under Elevated Temperatures

2009 ◽  
Vol 79-82 ◽  
pp. 2223-2226
Author(s):  
Ayman S. Mosallam
Keyword(s):  
Elevated Temperature ◽  
High Temperatures ◽  
Elevated Temperatures ◽  
Oxidative Degradation ◽  
Viscoelastic Behavior ◽  
Structural Performance ◽  
Crystalline Polymers ◽  
Damage To The Material ◽  
Continuous Working ◽  
Pultruded Composites

One of the major limitations for wider use of pultruded fiber reinforced polymeric (PFRP) composites in the civil engineering sector has been their behavior under elevated temperature and ultimately fire. This limitation arises not only due to the reduction in mechanical properties at high temperatures, including increased propensity to creep, but also due to limitations on the continuous working temperature causing permanent damage to the material as a result of thermal and oxidative degradation. Significant gains in property retention at high temperatures with crystalline polymers have been derived from the incorporation of fibrous reinforcement, but the development of new polymer matrices is the key for further elevation of the useful temperature range. This paper presents summary results of a research project focused on characterizing the viscoelastic behavior of commercially-produced, off-the-shelf unidirectional PFRP materials subjected to elevated temperature environments.

Tribological Study of Polymer Composite Forming Using Model Experiments and Real Composites

2014 ◽  
Vol 611-612 ◽  
pp. 300-305 ◽  
Author(s):  
Olga Smerdova ◽  
Michael P.F. Sutcliffe
Keyword(s):  
Experimental Study ◽  
Polymer Composites ◽  
Viscous Liquid ◽  
Polymer Composite ◽  
Contact Area ◽  
Essential Feature ◽  
The Other ◽  
Carbon Fabric ◽  
Simultaneous Application ◽  
Composite Forming

This experimental study is focused on identification of tribological mechanisms acting during forming of polymer composites. The range of relevant processes includes fibre placement, tape lay-up, moulding, draping, and RTM. Two types of tribological experiments, relying both on simultaneous application of compression and shear loadings, are carried out. Firstly, model macromechanical tests are undertaken on plastic rods of millimetric diameter immersed in a viscous liquid, representing composite fibres and matrix, respectively. By careful simulation of forming conditions, this experiment helps to identify the friction phenomena occurring in real composites. On the other hand, the micromechanics of forming processes is studied through a microscopic experiment on real carbon fabric. This material is clamped between two glass plates and pulled in opposing directions in the plane of the fabric. It is hypothesized that the evolution of contact area due to shearing that can be measured in this experiment is an essential feature of the tribology of forming processes, a topic which hitherto has not been investigated.

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