Modelling of rate-dependent load-strain behaviour of a PP geogrid at different ambient temperatures
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Author list: Chantachot T., Kongkitkul W., Tatsuoka F.
Publisher: Hindawi
Publication year: 2016
Start page: 849
End page: 858
Number of pages: 10
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
To study the temperature effects on load-strain-time behaviour of a polypropylene (PP) geogrid, a series of tensile loading testswere performed in which monotonic loading and sustained loading were applied under various temperature conditions. It was found that, with increasing the temperature, the tensile rupture strength and the stiffness of PP geogrid decrease, while creep strain increases. Moreover, the load-strain behaviour is a function of not only instantaneous irreversible strain and its rate but also temperature. To properly simulate the load-strain-time behaviours of geogrids, the framework of the non-linear three-component (NTC) model was modified taking into account the temperature effects. Effect of increasing in the temperature was treated as a kind of negative ageing effect, which results in time-dependent degradation of the strength and stiffness. It was revealed that theload-strain-time behaviour of the tested PP geogrid, which was affected by the ambient temperature, were well-simulated by the modified NTC model.
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