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Static load test on instrumented pile – field data and numerical simulations

Krasiński A., Wiszniewski M.

Studia Geotechnica et Mechanica

2017

Vol. 39, nr 3

17--25

Static load tests on foundation piles are generally carried out in order to determine load – the displacement characteristic of the pile head. For standard (basic) engineering practices this type of test usually provides enough information. However, the knowledge of force distribution along the pile core and its division into the friction along the shaft and the resistance under the base can be very useful. Such information can be obtained by strain gage pile instrumentation [1]. Significant investigations have been completed on this technology, proving its utility and correctness [8], [10], [12]. The results of static tests on instrumented piles are not easy to interpret. There are many factors and processes affecting the final outcome. In order to understand better the whole testing process and soil-structure behavior some investigations and numerical analyses were done. In the paper, real data from a field load test on instrumented piles is discussed and compared with numerical simulation of such a test in similar conditions. Differences and difficulties in the results interpretation with their possible reasons are discussed. Moreover, the authors used their own analytical solution for more reliable determination of force distribution along the pile. The work was presented at the XVII French-Polish Colloquium of Soil and Rock Mechanics, Łódź, 28–30 November 2016.

Operating conditions effect over the coupling strength for urban aerial ropeways

Martinod R. M, Estepa D, Paris C. E, Pineda F. A., Restrepo J. L., Castaneda L. F, Mejia G. A.

Transport Problems

2014

T. 9, z. 3

5--14

The present work is aimed to assess the operating conditions effect for urban aerial ropeways with a commercial usage, based on measurements obtained from an arrangement of sensors that record the coupling assembly behavior between the detachable gondola pod and the track rope. The work pays particular attention to the effect caused by external conditions due to the wind loads joined up with other parasite external effects, through the measurement of the engage strains. The cableway gondola continuous cycle has mono-cable of simple ring type.

Niniejszy artykuł ma na celu ocenę efektywnych warunków pracy dla miejskich napowietrznych kolei linowych z praktyką przemysłową na podstawie pomiarów uzyskanych z układem czujników, które rejestrują zachowanie gondoli w trakcie procesu wyprzęgania jej z liny. W artykule zwrócono szczególną uwagę na wpływ warunków zewnętrznych spowodowanych przez obciążenia wiatrem z dołączeniem innych obciążeń zewnętrznych przez pomiar naprężeń w trakcie wprzęgania. Kolej gondolowa jednolinowa ma pojedynczą linę prostego typu pierścieniowego.

Principal strain separation on coated specimen

Baksiova Z.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

z. 80 [274]

13-16

This paper deals with principal strain separation with strain gages. A normal-incidence photoelastic measurement on the PhotoStress coating provides the difference in principal strains at the test point. If the sum of the principal strains can be measured at the same point, then the separate principal strains are obtainable by simply adding and subtracting the two measurements. The measurement is perfprmed on coated specimen.