Dynamic bending of plates with low shear strength

1972 ◽  
Vol 4 (4-6) ◽  
pp. 544-549
Author(s):  
B. L. Pelekh ◽  
G. A. Teters
Keyword(s):  
Shear Strength ◽  
Dynamic Bending ◽  
Low Shear

Flexure of beams with low shear strength on an elastic foundation

1971 ◽  
Vol 3 (5) ◽  
pp. 582-585 ◽  
Author(s):  
Yu. M. Tarnopol'skii ◽  
A. V. Roze ◽  
R. P. Shlitsa
Keyword(s):  
Shear Strength ◽  
Elastic Foundation ◽  
Low Shear

scholarly journals Application of FRP Bolts in Monitoring the Internal Force of the Rocks Surrounding a Mine-Shield Tunnel

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2763 ◽  
Author(s):  
Zhen Liu ◽  
Cuiying Zhou ◽  
Yiqi Lu ◽  
Xu Yang ◽  
Yanhao Liang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Internal Force ◽  
Shield Tunnel ◽  
Corrosive Environment ◽  
High Tensile Strength ◽  
Technological Support ◽  
Remote Monitoring System ◽  
Initial Support ◽  
Low Shear

Monitoring the internal force of the rocks surrounding a mine-shield tunnel for the initial support of a mine-shield tunnel, in complex geological and hydrological environments, requires bolts with specific features such as high tensile strength, low shear strength, good insulation and resistance to corrosion. As such, internal force monitoring has become an important issue in safety monitoring for such tunneling projects. In this paper, the adaptability of a mine-shield tunnel project in a corrosive environment is investigated. A fiberglass reinforced plastic (FRP) bolt with high tensile strength, low shear strength, resistance to fatigue, non-conductivity and resistance to corrosion is used as a probe in tandem with an anchor-head dynamometer to monitor the internal force of the rocks surrounding a mine-shield tunnel for initial support. Additionally, solar energy collection technology is introduced to create a remote monitoring system. Using a 2.5 km long railway tunnel located in the northeast of the Pearl River Delta of China as a case study, the present study shows that, compared with a conventional steel bolt, the FRP bolt has advantages, such as avoidance of the risks associated with the shield machine, insulation and resistance to corrosion. As a probe, the response of the FRP bolt to events such as a blasting vibration and a construction disturbance that results in internal changes in the surrounding rock demonstrates a clear pattern that is appropriate for monitoring the internal force of the rocks surrounding a mine-shield tunnel in a corrosive environment. FRP bolt-based monitoring not only provides new technological support for controlling the risk involved in the initial support of a mine-shield tunnel but can also be widely deployed in projects with special requirements for disassembly, conductivity and corrosion.

The effect of soil strength on germination and emergence of wheat (Triticum aestivum L.). I. Low shear strength conditions

Soil Research ◽  
1985 ◽  
Vol 23 (4) ◽  
pp. 577 ◽  
Author(s):  
N Collis-George ◽  
P Yoganathan
Keyword(s):  
Triticum Aestivum ◽  
Shear Strength ◽  
Root Elongation ◽  
Experimental Studies ◽  
Fine Sand ◽  
Triticum Aestivum L ◽  
Initial Soil ◽  
Soil Shear Strength ◽  
Coleoptile Elongation ◽  
Low Shear

Experimental studies of the germination and emergence of wheat as affected by soil shear strength are reported. A fine sand under saturated conditions was used as the seed bed and the shear strength of the seed bed was increased to 10 kPa (0.1 bar) by externally applied loads. From the results it is concluded that the initial soil shear strength in this range has little effect on germination. However, coleoptile growth and root elongation are markedly reduced in the range 0-2.2 kPa such that total emergence is reduced to 7% at 9.3 kPa in this fine sand. The results clearly show that coleoptile elongation is more affected than root elongation by the same mechanical stress. Roots are found to be thicker and coleoptile thinner under increasing soil shear strength conditions.

Mechanical Properties of Adobe Masonry in Shear Test

2011 ◽  
Vol 71-78 ◽  
pp. 3691-3694
Author(s):  
Feng Wu ◽  
Gang Li ◽  
Jin Qing Jia ◽  
Hong Nan Li
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Small Towns ◽  
Test Results ◽  
Double Shear ◽  
Adobe Masonry ◽  
Force Displacement ◽  
Good Workability ◽  
Loading Procedure ◽  
Low Shear

There are many adobe buildings in small towns and villages of China, which have low shear strength of mud in joints and suffer great damages in big earthquakes. Mud with three different proportions of soil and sand are used in adobe masonry to discuss shear behavior and strength in this paper. Adobe samples in tests were laid by mud with clay-silt soil: construction medium sand at ratios of 1:0.8, 1:1.0 and 1:1.2 respectively, and adobe brick at ratio of 1:1.0 which has good workability. Short straws are mixed into mud and brick at 0.5% by weight. By monotonous loading procedure parallel to bed joint, two bed joints in prisms behave double shear failure in sequence. Meanwhile shear strengths and force-displacement curves are also obtained. Fitting equation for adobe shear strength is calculated, and the calculated results are agree with test results well. Shear failure of adobe masonry behaves brittle from force-displacement curves.

Research and Application of a New Constant Tension Control Device of the Carbon Fiber Warping Machine

2013 ◽  
Vol 846-847 ◽  
pp. 40-43
Author(s):  
Jian Feng Qin ◽  
Xiu Ming Jiang ◽  
Jian Cheng Yang ◽  
Hua Qing Wang ◽  
Kai Yang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Carbon Fiber ◽  
Control Device ◽  
Tension Control ◽  
High Tensile Strength ◽  
Yarn Tension ◽  
Warp Tension ◽  
Constant Tension ◽  
Low Shear

This paper presents a new constant tension control device which is suitable for warping of the carbon fiber or the flake yarns which are zero twist, high tensile strength, low shear strength, high specific modulus and self-lubrication and can meet the requirements of the warp tension of the carbon fiber multi-layer weaving equipment which is in the process of development. The device can make yarn tension consistent in warping process. Especially with the decrease of the diameter of yarn tube, the tension of yarn sheet is consistent in warping process. In the process of warping the warp doesnt twist and wear is small. The experimental results show that the mechanism can realize accurate control on the tension of the single yarn and the yarn sheet, and is able to meet the requirements of the warp tension of the carbon fiber multi-layer weaving equipment which is in the process of development.

scholarly journals The Behavior of a Thread-Bar Grouted Anchor in Soils from Local Strain Monitoring

2020 ◽  
Vol 10 (20) ◽  
pp. 7194
Author(s):  
Paolo Ruggeri ◽  
Viviene M. E. Fruzzetti ◽  
Giuseppe Scarpelli
Keyword(s):  
Shear Strength ◽  
Load Capacity ◽  
Poor Performance ◽  
Local Strain ◽  
International Standards ◽  
Strain Gauges ◽  
Fixed Length ◽  
Strain Monitoring ◽  
Sand Deposit ◽  
Low Shear

International standards discourage the use of grouted anchors with a fixed length exceeding 10 m. However, grouted anchors with a fixed length between 10 and 20 m are frequently used in Italy to transfer high loads to ground with poor geotechnical properties. This paper presents the results of investigation tests on an anchor with a length of 36 m, of which 18 m is fixed, sloping 40° from the horizontal; the anchor is comprised of a reinforced thread-bar which was instrumented with strain gauges and founded in nonhomogeneous ground, a sand deposit followed by marly clay. The test aimed at investigating the progressive mobilization of the shear strength along the foundation. The results indicate a very low shear strength offered by the sand, probably disturbed by the drilling, and an unusually fast mobilization of the shear strength in the marly clay at the deep end of the anchor. The results are particularly useful to identify the reasons for the observed poor performance of the grouted anchor. In particular, the study once again made it clear how important the influence of the execution details on reaching the expected load capacity may be, and likewise the practice of investigation tests on suitably instrumented test anchors.

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