scholarly journals Investigation of horizontal forces result in railway viaduct with curved truck

2013 ◽  
Vol 12 (2) ◽  
pp. 047-054 ◽  
Author(s):  
Piotr Olaszek ◽  
Juliusz Cieśla ◽  
Waldemar Szaniec
Keyword(s):  
Railway Track ◽  
Bridge Structure ◽  
Dynamic Effects ◽  
Passenger Cars ◽  
Limit States ◽  
Railway Line ◽  
Vertical Displacements ◽  
Special Train ◽  
Ultimate Limit ◽  
Crossing Test

In the report some investigations of bridge structure, connected with the adaptation of the railway line to speeds up to 200 km/h for conventional trains and up to 250 km/h for tilting trains were presented. A railway track is the characteristic feature of tested viaduct, because the truck is curved over the whole length of span with radius of R = 2600 m. The tests of the viaduct required the verification of influence of the dynamic effects on the ultimate limit states which corresponded to the safety of structure, as well as the serviceability limit states, related to the safety of driving and the travellers’ comfort. In frames of investigations, a special train comprised of two locomotives and four passenger cars, was used with speeds in the range between 10 and 200 km/h. The report focuses on the problems addressing the influence of horizontal actions in the case of bridge with curved truck. The measurements of the horizontal and vertical displacements as well as the accelerations of span, and the speed of crossing test train were executed. The measured and theoretically calculated chosen courses of displacements and accelerations were introduced. The degree of divergence between measured and calculated values was analysed.

Pull-Out Performance of T-Stub End Plate Connected To Concrete Filled Thin-Walled Steel Tube (CFTST) using Lindapter Hollo-Bolts

2018 ◽  
Vol 15 (1) ◽  
pp. 59
Author(s):  
NAZRUL AZMI AHMAD ZAMRI ◽  
CLOTILDA PETRUS ◽  
AZMI IBRAHIM ◽  
HANIZAH AB HAMID
Keyword(s):  
Limit Load ◽  
Steel Tube ◽  
Limit States ◽  
End Plate ◽  
Pull Out ◽  
Pullout Load ◽  
Thin Walled ◽  
Stub End ◽  
Concrete Filled Steel Tubes ◽  
Ultimate Limit

The application of concrete filled steel tubes (CFSTs) as composite members has widely been used around the world and is becoming popular day by day for structural application especially in earthquake regions. This paper indicates that an experimental study was conducted to comprehend the behaviour of T-stub end plates connected to concrete filled thin-walled steel tube (CFTST) with different types of bolts and are subjected to pullout load. The bolts used are normal type bolt M20 grade 8.8 and Lindapter Hollo-bolt HB16 and HB20. A series of 10 mm thick T-stub end plates were fastened to 2 mm CFTST of 200 mm x 200 mm in cross-section. All of the specimens were subjected to monotonic pull-out load until failure. Based on test results, the Lidapter Hollo-bolts showed better performance compare to normal bolts. The highest ultimate limit load for T-stub end plate fasten with Lindapter Hollo-bolt is four times higher than with normal bolt although all end plates show similar behaviour and failure mode patterns. It can be concluded that T-stub end plate with Lindapter Hollo-bolt shows a better performance in the service limit and ultimate limit states according to the regulations in the design codes.

The problem of sand drifts on railways

Innotrans ◽  
2021 ◽  
pp. 32-36
Author(s):  
Mahamajon M. Mirakhmedov ◽  
Keyword(s):  
Negative Impact ◽  
The State ◽  
Railway Track ◽  
Limit States ◽  
Protective Measures ◽  
Visual Monitoring ◽  
Sand Drift ◽  
Train Safety

The sand drift of the railway track and the blowing of the roadbed negatively affect the elements of the track infrastructure to such an extent that they reach the limit states at which it becomes impossible for them to continue functioning. This leads to a violation of train safety. To assess the negative impact of sand and determine the necessary protective measures, a method of visual monitoring of the state of the track is proposed.

Ultimate limit states in seismic retrofitting

2019 ◽  
pp. 126-165
Author(s):  
Dionysios Bournas ◽  
Andrea Prota ◽  
Souzana Tastani ◽  
Georgia Thermou ◽  
Thanasis Triantafillou
Keyword(s):  
Seismic Retrofitting ◽  
Limit States ◽  
Ultimate Limit

scholarly journals Verification of GNSS Measurements of the Railway Track Using Standard Techniques for Determining Coordinates

2020 ◽  
Vol 12 (18) ◽  
pp. 2874 ◽  
Author(s):  
Cezary Specht ◽  
Andrzej Wilk ◽  
Wladyslaw Koc ◽  
Krzysztof Karwowski ◽  
Paweł Dąbrowski ◽  
...  
Keyword(s):  
Measuring System ◽  
Railway Track ◽  
Satellite Measurements ◽  
Railway Line ◽  
University Of Technology ◽  
Railway Infrastructure ◽  
Spatial System ◽  
Mobile Satellite ◽  
Gnss Measurements ◽  
Geometric Layout

The problem of the reproduction of the railway geometric layout in the global spatial system is currently solved in the form of measurements that use geodetic railway networks and also, in recent years, efficient methods of mobile positioning (mainly satellite and inert). The team of authors from the Gdańsk University of Technology and the Maritime University in Gdynia as part of the research project InnoSatTrack is looking for effective and efficient methods for the inventory of railway lines. The research is part of a wider investigation BRIK (Research and Development in Railway Infrastructure, in polish: Badania i Rozwój w Infrastrukturze Kolejowej). This paper presents a comparative analysis of the problem of the reproduction of the trajectory of the measuring system using tacheometry, satellite measurements made using a measurement trolley, and mobile satellite measurements. Algorithms enabling the assessment of the compliance of satellite measurements with classic tacheometric measurements were presented. To this end, the authors held measurement sessions using modern geodetic instruments and satellite navigation on a section of the railway line. The results of the measurements indicate the convergence of the level of accuracy achieved by different measuring techniques.

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