scholarly journals Experimental Investigation on Pull-out Strength of Pre- and Post-Installed GFRP bars for Bridge Barrier Construction

2021 ◽  
Author(s):  
Alireza Abolghasem
Keyword(s):  
Experimental Investigation ◽  
Bridge Deck ◽  
Pullout Capacity ◽  
Pullout Strength ◽  
Research Information ◽  
Gfrp Bars ◽  
Pull Out ◽  
Design Values ◽  
Experimental Findings ◽  
Pull Out Strength

This study aims at providing research information on the pullout capacity of straight and headed-end GFRP bars embedded in bridge deck slab as pre-installed anchors for new bridge barrier-deck construction and as post-installed anchors for the replacement of deteriorated bridge barriers. In Phase I of this research, the pullout capacity of pre-installed ribbed-surface GFRP bars in twin- and triple-bar groups were investigated experimentally, considering different bar size, spacing and embedment depths. In phase II of this research, the pullout capacity of post-installed sand-coated and ribbed-surface GFRP bars were investigated experimentally considering different bar size and embedment depths and adhesive types. The experimental findings were compared with available experimental results and pullout formulas. Design values for the pullout strength of the GFRP bars as pre- and post-installed anchors in concrete were deduced.

scholarly journals Experimental Investigation on Pull-out Strength of Pre- and Post-Installed GFRP bars for Bridge Barrier Construction

2021 ◽  
Author(s):  
Alireza Abolghasem
Keyword(s):  
Experimental Investigation ◽  
Bridge Deck ◽  
Pullout Capacity ◽  
Pullout Strength ◽  
Research Information ◽  
Gfrp Bars ◽  
Pull Out ◽  
Design Values ◽  
Experimental Findings ◽  
Pull Out Strength

This study aims at providing research information on the pullout capacity of straight and headed-end GFRP bars embedded in bridge deck slab as pre-installed anchors for new bridge barrier-deck construction and as post-installed anchors for the replacement of deteriorated bridge barriers. In Phase I of this research, the pullout capacity of pre-installed ribbed-surface GFRP bars in twin- and triple-bar groups were investigated experimentally, considering different bar size, spacing and embedment depths. In phase II of this research, the pullout capacity of post-installed sand-coated and ribbed-surface GFRP bars were investigated experimentally considering different bar size and embedment depths and adhesive types. The experimental findings were compared with available experimental results and pullout formulas. Design values for the pullout strength of the GFRP bars as pre- and post-installed anchors in concrete were deduced.

scholarly journals EXPERIMENTAL INVESTIGATION OF PULL OUT STRENGTH OF FLEXIBLE TIES IN THIN BRICK VENEER LAYER

2020 ◽  
Vol 11 (4) ◽  
pp. 114-118
Author(s):  
Robertas Zavalis ◽  
Bronius Jonaitis
Keyword(s):  
Experimental Investigation ◽  
Experimental Research ◽  
Experimental Test ◽  
Brick Masonry ◽  
Test Results ◽  
Pull Out ◽  
Building Facades ◽  
Brick Veneer ◽  
Flexible Metal ◽  
Pull Out Strength

The use of thin brick veneer layers for building facades becomes more popular nowadays. Using thin bricks (50−65 mm thick) instead of normal 100−120 mm thick bricks let us to save expenses up to 50% related to materials. The connection of thin veneer layer with inner construction wall must be assured. Usually, the connection is fulfilled using flexible metal or composite ties. The main issue for this connection is tie pull out strength from thin brick masonry. This strength depends on type and construction of ties and it governs the number of ties need for facades. This article describes experimental research of pull out strength of flexible steel ties in thin brick masonry. Two possible anchoring types were used. Experimental test results and analysis are described in the article.

scholarly journals Experimental Investigation into Pull-Out Strength of Foamed Concrete Using Different Types of Screw

2014 ◽  
Vol 15 ◽  
pp. 01031 ◽  
Author(s):  
M.A. Othuman Mydin ◽  
N. Noordin ◽  
Z. Matori ◽  
N. Md Sani ◽  
N.F. Zahari
Keyword(s):  
Experimental Investigation ◽  
Pull Out ◽  
Different Types ◽  
Foamed Concrete ◽  
Pull Out Strength

Experimental Investigation on Rubber-Expanded Tube-to-Tubesheet Joints of Zr Heat Exchangers

2008 ◽  
Author(s):  
Biao Yuan ◽  
Ying Zhi Wang ◽  
Xin Ma ◽  
Shan-Tung Tu ◽  
Yan-An Xi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Heat Exchangers ◽  
Joint Strength ◽  
Operating Temperature ◽  
Experimental Results ◽  
Experimental Conditions ◽  
Working Temperature ◽  
Pull Out ◽  
Sealing Performance ◽  
Pull Out Strength

Mechanics of flexible expansion was expounded, and technology points of uniform rubber expanding in tube-to-tubesheet joints of Zirconium (Zr) heat exchangers were introduced. A series of pull-out strength and tightness experiments were performed for rubber-expanded tube-to-tubesheet joints. The experimental results show that the pull-out strength decreases linearly with increasing of operating temperature in the range of 20∼300°C, the pull-out strength of joints composed of Zr tubes attached to 16MnR and 316L tubesheets (abbreviated as Zr/16MnR and Zr/316L joints and heat exchangers include these joints are called Zr heat exchangers) drops much faster than that of joints composed of Titanium (Ti) tubes attached to 16MnR tubesheets (abbreviated as Ti/16MnR joints), and the joint strength can meet the requirements specified in Chinese code & standard at the experimental conditions. It is also found that the tightness of rubber expanded tube-to-tubesheet joints drops obviously with the increase of working temperature from 20 to 200°C, and the sealing performance of the joints enhances markedly when rubber-expanded tube-to-tubesheet joints are subsequently expanded with roller. Moreover, the influences of Enlargement Rate of Tubesheet Hole (ERTH) on the strength of rubber-expanded tube-to-tubesheet joints is discussed, it is observed that the pull-out strength of the connection joints with non-grooved tubesheet holes increases linearly with increasing of ERTH when the expanding pressure is not larger than 38 MPa, whereas this is not the case for the joint with grooved tubesheet holes.

scholarly journals Investigation on the capacity of TL-5 GFRP-reinforced concrete bridge barrier-deck anchorage subjected to transverse vehicle impact loading

2021 ◽  
Author(s):  
Gledis Dervishhasani
Keyword(s):  
Epoxy Adhesive ◽  
Experimental Program ◽  
Concrete Bridge ◽  
Pullout Capacity ◽  
Gfrp Bars ◽  
Gfrp Bar ◽  
Normal Strength ◽  
Experimental Findings ◽  
Barrier Wall ◽  
Deck Slab

A new Ontario-based glass fiber reinforced polymer (GFRP) bar manufacturer developed high-modulus (HM) GFRP bars with headed ends for use in bridge construction. This thesis presents a structural qualification procedure to qualify the use of the developed GFRP bars in concrete bridge barriers-deck joint. The thesis is comprised of two phases. The first phase includes an experimental program to investigate the pullout capacity of the GFRP bar anchorage in normal strength concrete. In phase two, three sets of full-scale TL-5 barrier wall-deck system of 900 mm length were cast and tested to-collapse. The first set incorporated headed-end GFRP bars to connect the barrier wall to a deck slab cantilever for better pre-installed anchorage. The second set is identical to the first set but for non-deformable thick deck slab. The third set incorporated post-installed GFRP bars in non-deformable thick deck slab using a commercial epoxy adhesive. Experimental capacities of the tested specimen were then correlated with factored applied moments given by the 2006 Commentaries of the Canadian Highway Bridge Design Code and available equations in the literature. Based on the experimental findings, conclusions and recommendations were drawn.

scholarly journals Investigation on the capacity of TL-5 GFRP-reinforced concrete bridge barrier-deck anchorage subjected to transverse vehicle impact loading

2021 ◽  
Author(s):  
Gledis Dervishhasani
Keyword(s):  
Epoxy Adhesive ◽  
Experimental Program ◽  
Concrete Bridge ◽  
Pullout Capacity ◽  
Gfrp Bars ◽  
Gfrp Bar ◽  
Normal Strength ◽  
Experimental Findings ◽  
Barrier Wall ◽  
Deck Slab

A new Ontario-based glass fiber reinforced polymer (GFRP) bar manufacturer developed high-modulus (HM) GFRP bars with headed ends for use in bridge construction. This thesis presents a structural qualification procedure to qualify the use of the developed GFRP bars in concrete bridge barriers-deck joint. The thesis is comprised of two phases. The first phase includes an experimental program to investigate the pullout capacity of the GFRP bar anchorage in normal strength concrete. In phase two, three sets of full-scale TL-5 barrier wall-deck system of 900 mm length were cast and tested to-collapse. The first set incorporated headed-end GFRP bars to connect the barrier wall to a deck slab cantilever for better pre-installed anchorage. The second set is identical to the first set but for non-deformable thick deck slab. The third set incorporated post-installed GFRP bars in non-deformable thick deck slab using a commercial epoxy adhesive. Experimental capacities of the tested specimen were then correlated with factored applied moments given by the 2006 Commentaries of the Canadian Highway Bridge Design Code and available equations in the literature. Based on the experimental findings, conclusions and recommendations were drawn.

scholarly journals The effect of tissue culture on suture holding strength and degradation in canine tendon

2009 ◽  
Vol 34 (5) ◽  
pp. 643-650 ◽  
Author(s):  
H. OMAE ◽  
C. ZHAO ◽  
Y.-L. SUN ◽  
M. E. ZOBITZ ◽  
S. L. MORAN ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Tensile Load ◽  
Flexor Digitorum Profundus ◽  
Tendon Suture ◽  
Pull Out ◽  
Culture Model ◽  
Static Tensile ◽  
Tissue Culture Model ◽  
Flexor Digitorum ◽  
Pull Out Strength

The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface.

Experimental Study on Bond Behavior of GFRP-to-Cement Mortar

2011 ◽  
Vol 94-96 ◽  
pp. 543-546
Author(s):  
Ning Zhang ◽  
Ai Zhong Lu ◽  
Yun Qian Xu ◽  
Pan Cui
Keyword(s):  
Aluminium Alloy ◽  
Cement Mortar ◽  
Bond Stress ◽  
Reinforcing Bars ◽  
Bond Performance ◽  
Gfrp Bars ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Average Bond

Direct pull-out tests were performed to evaluate the bond performance of glass fiber-reinforced polymer (GFRP) reinforcing bars in cement mortar. Specimens with different bar diameters and different grouted lengths (i.e., 5d, 10d and 15d, d is the diameter of bars) are prepared for the pull-out tests. For comparison, specimens with plain aluminium alloy bars (AAB) were tested as well. The result shows that the average bond stress between plain aluminium alloy bars and cement is much smaller than that between the deformed GFRP bars and cement; thin GFRP bars tended to have larger average bond stress; the shorter the grouted length, the smaller the maximum average bond stress. Only part of grouted length undertakes the bond stress and the length depends on the shear modulus of GFRP and the surrounding material.

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