scholarly journals Specificity of strength calculation for glued-in steel rods in LVL with unidirectional veneer

2018 ◽  
Vol 2 (51) ◽  
pp. 196-201
Author(s):  
Andrii Bidakov ◽  
Evhenyi Raspopov ◽  
Oksana Pustovoitova
Keyword(s):  
Comparative Analysis ◽  
Failure Mode ◽  
Cross Section ◽  
Joint Strength ◽  
Design Method ◽  
Strength Calculation ◽  
Test Results ◽  
Rigid Connection ◽  
The Cross ◽  
Made In

Design of joints of LVL elements with glued-in steel rods and metal connectors is considered as semi-rigid connection and requires taking of account the compliance. A comparative analysis of the test results of the beams with a metal connector and glued-in steel rods as well as solid beams is made in the paper. Design method of glued-in rods in LVL is proposed and taken into account failure mode. It allows reducing the distance between the axes of the rods as well as the distance from the rod axіs to the edges in the cross section of the beam and increasing the joint strength.

Note on Losses in Cable Sheaths

1928 ◽  
Vol 24 (1) ◽  
pp. 65-73 ◽  
Author(s):  
F. W. Carter
Keyword(s):  
Cross Section ◽  
Eddy Current ◽  
Distribution Systems ◽  
Power Cables ◽  
Circulating Current ◽  
Outer Sheath ◽  
The Cross ◽  
Current Flows ◽  
Made In

In a recent communication to the Society, the author referred to cable-sheath losses, and gave formulae for computing them in certain cases. These appertained to power cables in which were comprised a group of conductors, arranged symmetrically and encased in a single conducting sheath. In some distribution systems, however, the conductors for the several phases are encased in separate lead sheaths, which are either laid in proximity as separate cables, or grouped and comprehended in an outer sheath. The analysis previously given does not include such cases directly. Moreover, it is common practice either to lay the elementary cables with sheaths in contact, or to bond the sheaths together at the ends of suitable sections, in order to prevent differences of potential between them; and, when this is done, a circulating current flows in the circuit of the sheaths and bonds, sufficient to maintain equality of potential between the several sheaths. This current, to which reference was made in the former paper, is additional to the eddy current discussed therein, the integral of which over the cross section of the sheath is zero. It is for convenience here referred to as the “circulating current,” to distinguish it from the “eddy current,” although there is no such distinction between them as the names imply.

Poverty in the Dolnośląskie Voivodship

2016 ◽  
Vol 61 (6) ◽  
pp. 70-85
Author(s):  
Agata Girul
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Objective Assessment ◽  
Subjective Assessment ◽  
Poverty Level ◽  
The Cross

The article presents selected aspects of economic poverty in the Dolnośląskie Voivodship on the background of the country and other voivodships, as well as in the cross-section of the Dolnośląskie powiats in 2013, as compared to 2010. The comparative analysis of poverty level by powiats was presented by means of taxonomic synthetic measure based on a set of three selected diagnostic indicators. A complement to the objective assessment of poverty in the Dolnośląskie Voivodship was a presentation of results of subjective assessment of material situation of households in the voivodships’ cross-section.

A new design method for a strain sensor using the cross-section modification of a coaxial cable

2013 ◽  
Vol 203 ◽  
pp. 355-361 ◽  
Author(s):  
Pengfei Shi ◽  
Renjing Gao ◽  
Shutian Liu ◽  
Jian Zhao
Keyword(s):  
Cross Section ◽  
Design Method ◽  
Strain Sensor ◽  
Coaxial Cable ◽  
The Cross

scholarly journals Increasing the Sensitivity of Protections in Electrical Networks up to 1 kV by Using Microprocessor and Semiconductor Release Tripping Devices

2021 ◽  
Vol 64 (5) ◽  
pp. 393-407
Author(s):  
A. Yu. Kapustsinski ◽  
S. N. Kаnstantsinava
Keyword(s):  
Comparative Analysis ◽  
Electric Power ◽  
Cross Section ◽  
Electrical Networks ◽  
Circuit Breakers ◽  
Electric Networks ◽  
Positive Effects ◽  
Protective Devices ◽  
The Cross ◽  
Negative Phenomena

The paper deals with the problem of increasing the efficiency of the functioning of electric networks up to 1 kV, namely, the possibility of increasing the sensitivity of protections in networks up to 1 kV, which helps to reduce the protection response currents and, accordingly, reduce the cross-section of cable and wire products. The topicality of this problem is shown and the research tasks are defined. Much attention is paid to the concept of selectivity; attention is also paid to the concepts of full and partial selectivity. “Which protective devices can be considered selective?” is a question that is considered and worked out in sufficient depth in the paper. The negative phenomena that occur when ensuring the selectivity of protections in networks up to 1 kV are systematized and described in detail. Based on a comparative analysis of the parameters of circuit breakers with release tripping devices of various types, a solution to this problem is proposed by using circuit breakers with microprocessor and semiconductor release tripping devices. Additional advantages of microprocessor-based circuit breakers are considered and indicated, as well as their disadvantages are indicated, too. The main expected positive effects from the use of circuit breakers with microprocessor release tripping devices are listed, taking into account the fact that this type of circuit breakers is considered as a complex of devices replaced by it. The article can be recommended to employees of electric power specialties working with networks up to 1 kV.

Investigation of a combined failure mode for screw anchors under tension

2020 ◽  
Vol 23 (13) ◽  
pp. 2803-2812
Author(s):  
Zhao Chen ◽  
Somayeh Nassiri ◽  
Anthony Lamanna
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Regression Model ◽  
Failure Mode ◽  
Design Method ◽  
Test Results ◽  
Capacity Design ◽  
Tension Tests ◽  
Combined Mode ◽  
Combined Failure

A modified concrete capacity design method is available to predict the ultimate tensile strength ( Nu) of screw anchors. Screw anchors commonly fail in a combination of concrete breakout and pullout modes. This combined mode is not distinguished from the breakout mode in the modified concrete capacity design method, which may cause confusions to designers. To investigate the Nu of the combined mode ( Ncomb), this study included 144 unconfined tension tests on screw anchors from three manufacturers in three diameters and two effective embedment depths ( hef) per diameter. Approximately 80% of the tested anchors failed in the combined mode. The differences in Ncomb among the three manufacturers were insignificant despite their varied thread design. Ncomb was found to be linearly correlated to the parameter hef 1.3 but was found independent of the anchor diameter. A regression model was developed to specifically predict Ncomb. The model showed a good fit with the test results.

scholarly journals The comparative analysis of the seismic test results performed using the cross-hole and down-hole methods in terms of test reliability and efficiency

2018 ◽  
Vol 66 ◽  
pp. 01021
Author(s):  
Wojciech Tschuschke ◽  
Sławomir Gogolik ◽  
Maciej Kroll ◽  
Krzysztof Janicki
Keyword(s):  
Comparative Analysis ◽  
Small Strain ◽  
Test Reliability ◽  
Engineering Practice ◽  
Test Results ◽  
In Situ Tests ◽  
The Cross ◽  
Seismic Tests

Seismic tests are becoming more and more meaningful in modern geoengineering since they allow precise assessment of changes in the analyzed profile of soil deformation parameters at very small strain. The engineering practice generally uses two methods for such kinds of tests: reference cross-hole test and commercial down-hole method. The costs of implementation of this kind of research and the reliability of the results obtained along with any additional benefits from the type of the selected testing technique are not without significance. Seismic measurements for which comparative analysis was performed were carried out in a strongly anisotropic materials base of a tailings. The results of tests conducted with a standard cross-hole method were compared with those conducted using the down-hole method, in which the seismic piezocone (SCPTU) and seismic dilatometer (SDMT) were used. Test results have shown that in terms of assessment of their credibility, there were no fundamental differences in the quality of the recorded signals. It has been pointed out, however, that there are many advantages to penetration in situ tests, which complement identification of subsoil structure with many crucial elements that cannot be achieved using the cross-hole method.

scholarly journals Momentum Transfer Cross Section for Electrons in Krypton Derived from Measurements of the Drift Velocity in H2?Kr Mixtures

1988 ◽  
Vol 41 (5) ◽  
pp. 701 ◽  
Author(s):  
JP England ◽  
MT Elford
Keyword(s):  
Momentum Transfer ◽  
Cross Section ◽  
Drift Velocity ◽  
Cross Sections ◽  
Personal Communication ◽  
Electron Drift ◽  
Velocity Data ◽  
The Cross ◽  
Momentum Transfer Cross Section ◽  
Made In

Measurements of electron drift velocities have been made in 0�4673% and 1�686% hydrogenkrypton mixtures at 293 K and values of E/ N from 0�08 to 2�5 Td with an estimated uncertainty of <�0�7%. The data have been used in conjunction with the H2 cross sections of England et aL (1988) to derive the momentum transfer cross section for krypton over the energy range 0�05 to 6�0 eV. The drift velocity data have also been used to test the Kr momentum transfer cross sections of Koizumi et aL (1986) and Hunter (personal communication 1988). The cross section of Koizumi et aL is clearly incompatible with the present measurements while the cross section of Hunter has been used to predict these measurements to within 1% to 3%.

Adapting Parametric Acoustic Arrays for Tomographic Imaging

1988 ◽  
Vol 10 (3) ◽  
pp. 196-203
Author(s):  
Anni Cai ◽  
Jing Ao Sun ◽  
Glen Wade
Keyword(s):  
Theoretical Model ◽  
Cross Section ◽  
Tomographic Reconstruction ◽  
Simple Relation ◽  
Tomographic Imaging ◽  
Nonlinear Parameter ◽  
Acoustic Arrays ◽  
Parametric Array ◽  
The Cross ◽  
Made In

In this paper, we present a theoretical model of a parametric array for tomographic applications. The array in the model is assumed to extend right up to the receiver and its cross section is assumed not to be negligible. These two assumptions have not been previously made in applications concerned with tomography. We invoke conditions that permit the derivation of a simple relation for tomographic reconstruction of variations in the acoustic nonlinear parameter throughout the cross section of an object.

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