A proposal for the local stresses in retrofitted crane runway girders due to eccentric wheel loading

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1031-1038
Author(s):  
Markus Kettler ◽  
Harald Unterweger ◽  
Christoph Derler
Keyword(s):  
Local Stresses ◽  
Wheel Loading ◽  
Eccentric Wheel

Local stresses in retrofitted crane runway girders with boxed upper flange due to eccentric wheel loading

Structures ◽  
2020 ◽  
Vol 25 ◽  
pp. 646-659
Author(s):  
Markus Kettler ◽  
Franz Kiem ◽  
Harald Unterweger
Keyword(s):  
Local Stresses ◽  
Wheel Loading ◽  
Eccentric Wheel

scholarly journals Flexural Performance of a Hybrid Bridge Deck with Pultruded Fibre Reinforced Polymer Composite Sandwich Panels

2018 ◽  
Vol 13 (3) ◽  
pp. 165-191 ◽  
Author(s):  
Lei Wu ◽  
Yujun Qi ◽  
Weiqing Liu
Keyword(s):  
Working Conditions ◽  
Bridge Deck ◽  
Composite Sandwich ◽  
Four Point Bending ◽  
Reinforced Polymer ◽  
Hybrid Bridge ◽  
Service Load ◽  
Fibre Reinforced Polymer ◽  
Wheel Loading ◽  
Eccentric Wheel

Hybrid bridge decks with the pultruded fibre reinforced polymer have advantageous properties but easily crack because of their unsatisfactory transverse strength and shear strength. This study proposed a type of bridge deck composed of innovative pultruded fibre reinforced polymer composite sandwich panels. Using four-point bending tests, concentric wheelloading tests and eccentric wheel-loading tests combined with first-order shear deformation theory, this study investigated the failure mode, flexural capacity, deformation and ductility of hybrid bridge decks under different working conditions. Under four-point bending and concentric wheel loading, the primary failure modes for this hybrid bridge deck were shear failures along the fibre direction and buckling failure of the upper panel. Under eccentric wheel loading, the primary failure mode was a torsional failure due to the eccentric load. The bearing capacities of the hybrid bridge deck under the three working conditions were 3.8, 3.5 and 3.2 times the service load of a Class I vehicle load, respectively. Besides, the hybrid bridge deck remained in the linear elastic stress state at 2.6 times the service load, indicating that this hybrid bridge deck withstands relatively large vehicle overload without visible damage. The ductility values of this hybrid bridge deck under the three working conditions were 1.79, 2.09 and 2.00, respectively, which are higher than the values for an ordinary pultruded bridge deck. Therefore, the proposed design has the relatively good energy-dissipating capacity, which improves the emergency capacity of the bridge deck.

scholarly journals Laboratory tests on a real crane runway girder with welded box section and eccentric wheel loading

ce/papers ◽  
2019 ◽  
Vol 3 (3-4) ◽  
pp. 529-534
Author(s):  
Markus Kettler ◽  
Harald Unterweger
Keyword(s):  
Laboratory Tests ◽  
Box Section ◽  
Wheel Loading ◽  
Eccentric Wheel

Numerical analysis of the variation of local stresses with the groove thickness

2018 ◽  
Author(s):  
Carlos Geovane Alves ◽  
Jorge Alberto Rodriguez Duran ◽  
Bruno Gomes Tavares
Keyword(s):  
Numerical Analysis ◽  
Local Stresses

Elastic Stress Singularities: Implications for the Attachment of Tendon to Bone

2011 ◽  
Author(s):  
Yanxin Liu ◽  
Victor Birman ◽  
Chanqing Chen ◽  
Stavros Thomopoulos ◽  
Guy M. Genin
Keyword(s):  
Stress Distribution ◽  
Abrupt Change ◽  
Elastic Stress ◽  
Insertion Site ◽  
Stress Singularities ◽  
Local Stresses ◽  
Material Mismatch ◽  
Moduli Of Elasticity

The material mismatch at the attachment of tendon to bone is amongst the most severe for any tensile connection in nature. This is related to the large difference between the stiffness of tendon and bone, whose moduli of elasticity vary by two orders of magnitude. Predictably, such an abrupt change in the stiffness realized over a very narrow insertion site results in high local stresses. One of the implications of the stress distribution is a potential for stress singularities at the junction of the insertion to the bone.

scholarly journals Mapping of scatter in fatigue life assessment of welded structures—a round-robin study

2021 ◽  
Author(s):  
Gustav Hultgren ◽  
Mansoor Khurshid ◽  
Peter Haglund ◽  
Zuheir Barsoum
Keyword(s):  
Fatigue Life ◽  
Round Robin ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Fatigue Life Estimation ◽  
Box Structures ◽  
Load Carrying ◽  
Local Stresses ◽  
Sources Of Variation ◽  
Global And Local

AbstractA round-robin study has been carried out within a national project in Sweden with the addition of an international participant, where several industrial partners and universities are participating. The project aims to identify variation and sources of variation in welding production, map scatter in fatigue life estimation, and define and develop concepts to reduce these, in all steps of product development. The participating organisations were asked to carry out fatigue life assessment of welded box structures, which is a component in load-carrying structures. The estimations of fatigue life have also been compared with fatigue test results. Detailed drawings, loads and material data were also given to the participants. The participants were supposed to use assessment methods based on global and local stresses using the design codes or recommendations they currently use in-house. Differences were identified between both methods and participants using the same codes/recommendations. Applicability and conditions from the cases in the codes were also identified to be differently evaluated between the participants. It could be concluded that for the applied cases the nominal stress method often overestimated the fatigue life and had a high scatter in the estimations by different participants. The effective notch method is conservative in comparison to the life of tested components with little scatter between the results derived by the participants.

Paper 5: Track Parameters, Static and Dynamic

1965 ◽  
Vol 180 (6) ◽  
pp. 73-85 ◽  
Author(s):  
F. Birmann
Keyword(s):  
Phase Shift ◽  
Dynamic Behaviour ◽  
Limit Values ◽  
The Third ◽  
New Methods ◽  
Measuring Techniques ◽  
Wheel Loading

In the first part a static investigation is made of the total elasticity of the track on soft sub-soil and loose ballast, and for rock and consolidated bedding. The oscillating mass of the permanent way will differ in behaviour, depending on construction, rail profile, sleeper spacing, etc. The damping and the phase shift can be determined by modern measuring techniques and a few limit values are given. In the second part the dynamic behaviour of the track is investigated for velocities up to 200 km/h. New methods of measuring the wheel loading on the rail are briefly described. Elements of permanent way calculation, based on new methods of computation, are briefly considered. The role of the lateral elasticity of the rail is shown in the third part, theoretically and according to measurements.

Determination of loading capacity index of a continuous miner in soft rock roadway and virtual test method

2022 ◽  
pp. 095440622110616
Author(s):  
Hong Zhang ◽  
You Chen ◽  
Zhihong Zhang ◽  
Honghong Yan
Keyword(s):  
Energy Consumption ◽  
Soft Rock ◽  
Test Method ◽  
Energy Utilization ◽  
Loading Capacity ◽  
Continuous Miner ◽  
Loading Efficiency ◽  
Wheel Loading ◽  
Soft Rock Roadway ◽  
Rock Roadway

To improve the loading efficiency and reduce energy consumption of a continuous miner in soft rock roadway, a seven-arm star wheel designed with Gaussian fitting method was proposed, and a coal loading model of the continuous miner star wheel loading mechanism was reconstructed with EDEM software. The loading capacity of the seven-arm star wheel and the three-arm star wheel of the EML340 continuous miner at different working speeds were studied respectively. The scientific and reasonable identification index was formulated and the index evaluation system of loading star wheel was established. It has been found that the performance of the loading star wheel is a collection of various identification indicators, the coal returning mass reducing the loading efficiency and increasing unnecessary energy consumption, therefore, it is difficult to identify by a single index. Loading coal and rock by the star wheel is a process that consumes energy and pays attention to output, therefore, the identification index should include two kinds of efficiency parameters and energy parameters. Rake coal torque and loading specific energy consumption have reflected the degree of energy utilization, which can be comprehensively used for preliminary design of the star wheel. The performance parameters such as loading power and loading efficiency are reliable indicators for designing and performance evaluation of the star wheel. Based on the statistical analysis of the test data, compared with the three-arm star wheel of the EML340 continuous miner, the loading efficiency of the seven-arm star wheel has been significantly improved. The loading power for coal loading has been reduced by 46%. The feasibility of the Gaussian design method of loading star wheel has been verified.

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