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 Fire Behavior of the Assembled Monolithic Hollow-Ribbed Slabs

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
B. Li ◽  
Y. Q. Lin ◽  
H. L. Zhang ◽  
M. J. Ma
Keyword(s):  
Experimental Data ◽  
Optimum Design ◽  
Fire Resistance ◽  
Fire Behavior ◽  
Great Influence ◽  
Fire Tests ◽  
Structural Fire ◽  
Temperature Distributions ◽  
Comparison Of The Results

This paper presents the results from the furnace tests conducted on two assembled monolithic hollow-ribbed (AMH) slabs consisting of the open box and the covered box, respectively. Detailed experimental data in the form of describing slab cracking or spalling, furnace temperatures, temperature distributions, and vertical deflections are presented. Comparison of the results from the two fire tests indicates that the covered box shows better fire resistance compared to the open box; thus, the covered box is recommended to adopt in structural fire-resistant design. However, they are both prone to cracking or spalling at their bottom surfaces during the fire tests, so the AMH slab still needs further optimum design to meet its requirements of fire resistance and service function. In addition, the sealing quality of congruent boxes also has a great influence on the fire resistance of the AMH slab.

EXPERIMENTAL STUDY ON STRUCTURAL BEHAVIOR OF FIRE PROTECTED DOUBLE CFT COLUMN SUBJECTED TO FIRE LOAD

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Kyung Soo Chung ◽  
Jae Sung Lee ◽  
Jong Eun Song ◽  
Woo Chul Kim ◽  
Heung Youl Kim ◽  
...  
Keyword(s):  
Fire Resistance ◽  
Fire Test ◽  
Failure Modes ◽  
Temperature Deformation ◽  
Fire Tests ◽  
Fire Performance ◽  
Fire Load ◽  
Standard Fire ◽  
Fire Endurance ◽  
Cft Column

New concrete filled double-tube (CFDT) sections consist of an inner and outer tube with fire protection mortar (FPM) filling the cavity between them and the inner tube also filled with concrete or not. An investigation into the fire performance of CFDT during the standard fire test is reported. Six full size FPM filled CFDT columns were designed for the fire tests. Detail failure modes of overall specimens and each component in the columns as well as temperature, deformation and fire endurance were presented. It showed that the fire resistance in the CFDT columns is significantly higher than that in concrete filled steel tubular (CFT) columns. Investigation into the fire performance of the columns reveals possible solutions to improve the fire resistance of CFT members.

scholarly journals Experimental Study of Torque Using a Small Scoop on the Lunar Surface

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Long Xue ◽  
Baichao Chen ◽  
Zhenjia Zhao ◽  
Zhaolong Dang ◽  
Meng Zou
Keyword(s):  
Experimental Study ◽  
Bulk Density ◽  
Lunar Surface ◽  
Great Influence ◽  
Test Results ◽  
The Moon ◽  
Rotating Speed ◽  
Simple Apparatus ◽  
The Earth

Chinese missions to the moon are planned to sample the regolith and return it to the earth. Microscale excavators may be good candidates for these missions, as they would significantly reduce the launch mass. Thus, it is necessary to research the interaction between the scoop and the regolith being sampled. We present the development of a simple apparatus to measure excavation torque. All tests were conducted using TYII-2 regolith simulant with gravels. The test results show that, under loose regolith conditions, the penetrating angle and the bulk density had a great influence on the excavation torque, while the rotating speed had little effect. However, when the bulk density was compact, the rotating speed did influence the excavation torque. The excavation torque increased sharply when the scoop encountered the gravels; actually, some of the parameters will influence the value of the torque such as the diameter, quantity, and position and inbuilt depth of the gravels. When the excavation torque sharply increases, the operation should be immediately stopped and checked.

Experimental Investigation on Fire Resistance of CES Columns Subjected to 3-Side Heating

2011 ◽  
Vol 250-253 ◽  
pp. 1657-1666
Author(s):  
Xiao Yong Mao ◽  
Wei Hua Guo ◽  
Li Li Li
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Fire Resistance ◽  
Structural Response ◽  
Load Ratio ◽  
Test Results ◽  
Key Factors ◽  
Fire Condition ◽  
Load Intensity ◽  
Steel Section

Results of experimental study on fire resistance of four concrete encased steel (CES) columns are presented. The four columns have the same steel section and reinforcements but different load intensity and load eccentricity, which were the key factors for fire resistance of CES columns under fire condition. The tested results are utilized to study the effect of various parameters on thermal and structural response of CES columns. Spalling of CES columns under fire condition are also investigated. Test results show that CES columns under 3-side heating have higher fire resistance than that under 4-side heating. Also, load ratio and load eccentricity have noticeable influence on the fire resistance of CES columns. In addition, spalling of concrete decreases the fire resistance of CES columns.

Experimental Study on the Secondary Consolidation Properties of Marine Soft

2014 ◽  
Vol 638-640 ◽  
pp. 452-456 ◽  
Author(s):  
Chao Jie Zhang ◽  
Shi Hua Chen ◽  
Guo Qian Liang ◽  
Hai Yun Wei
Keyword(s):  
Experimental Study ◽  
Great Influence ◽  
Test Results ◽  
Loading History ◽  
Coefficient Of Consolidation ◽  
One Dimensional ◽  
Deformation Law ◽  
Subsequent Deformation ◽  
The One ◽  
Previous Loading

Through the one dimensional consolidation of creep test, the paper presents and analyzes the deformation law of reloading under different stress level, the variation of the coefficient of consolidation and the relation between the secondary consolidation deformation and loading history. These test results show that the secondary compression during previous loading has great influence on the subsequent deformation of soil.

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.

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.

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