Browsing by Subject "load test"

Now showing 1 - 3 of 3

Access status: Open Access ,
Metody obliczania nośności granicznej pali fundamentowych
(2008) Rybak, Jarosław
This introduction of dynamic load tests considerably increased the reliability of implemented pile works. For example: in the years 2005-2007 the number of tested pre-cast concrete piles already exceeded the average 2,5 for every 1000 running metres of driven piles. Comparatively, in Polish Code regulations it is required to test not much more than 1 pile for each 100 (which, by the average pile length of more than 10 m, gives the ratio of 1,0 for every 100 running metres). The fact that the dynamic tests have become widespread does not at all mean that the amount of static tests has decreased. They ceased to be, however, the basic load capacity tests, whose goal was to verify the design, since now, the static tests are rather the reference test for a larger number of dynamic tests. For that reason, the static load tests must be designed in such way, so that they lead to the determination of failure load, or - at least - so that they make it possible to obtain the data necessary for the identification of failure load by extrapolation. This work presents the methods of the computation of pile failure load and the results of failure load calculations for the previously tested piles. The 80%-method described in the work, after it has been examined on a larger amount of tests, may be, in future, a functional tool in the computing of pile failure load on the basis of static tests.
Access status: Open Access ,
Zastosowanie metod estymacji odpornej w obliczeniach nośności granicznej pali
(2008) Muszyński, Zbigniew; Rybak, Jarosław
This work presents the results of the calculations of foundation pile load failure on the basis of the so-called 80%-method, formulated by Brinch Hansen. The approximation procedure has been analysed from the point of view of: the number of measurements of settlements, taken into account in the calculations, the weights of the settlement measurements and the change in the weights of particular settlement measurements (the elimination of errors by the resistant estimation). With the use of Mathcad environment, an algorithm was developed, which serves the calculating of load failure by the following methods: least squares method, when the same weights are assumed for all the analysed points; least squares method, assuming differentiated weights for particular points; Huber method, assuming the initial differentiation of weights; Danish method, with the assumption, that the weights for particular points are initially differentiated. In the computations, one made use of the last six observations in the aspect of elastic-plastic work of piles (the last six observations before the ending of the load test). The conclusions from the calculations are intended to constitute the starting point for the further development of the method of failure load computation on the basis of the results from the static load test, for the needs of calibrations - introduced, with growing frequency, into dynamic load tests.
Access status: Open Access ,
Znaczenie prób obciążeniowych układów wyciągowych urządzeń wiertniczych i eksploatacyjnych
(2010) Bednarz, Stanisław; Artymiuk, Jan
Mast and drawworks system for running and pulling drill string, holding it at drilling, casing and tubing running operations influences on mast/derrick load value. Additionally high load of drawworks can be exerted during rig up operation. Load tests of mast and drawworks performed give impact of loading forces on mast framework behaviour, eventuality of design defects and critical deformations. Load tests decrease risk for implementation of systems uncomplying with basic safety requirements.