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| Titel |
Numerical and analytical investigation towards performance enhancement of a newly developed rockfall protective cable-net structure |
| VerfasserIn |
S. Dhakal, N. P. Bhandary, R. Yatabe, N. Kinoshita |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 4 ; Nr. 12, no. 4 (2012-04-20), S.1135-1149 |
| Datensatznummer |
250010707
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1135-2012.pdf |
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| Zusammenfassung |
| In a previous companion paper, we presented a three-tier modelling of a
particular type of rockfall protective cable-net structure (barrier),
developed newly in Japan. Therein, we developed a three-dimensional, Finite
Element based, nonlinear numerical model having been
calibrated/back-calculated and verified with the element- and
structure-level physical tests. Moreover, using a very simple, lumped-mass,
single-degree-of-freedom, equivalently linear analytical model, a
global-displacement-predictive correlation was devised by modifying the
basic equation – obtained by combining the principles of conservation of
linear momentum and energy – based on the back-analysis of the tests on the
numerical model. In this paper, we use the developed models to explore the
performance enhancement potential of the structure in terms of (a) the
control of global displacement – possibly the major performance criterion
for the proposed structure owing to a narrow space available in the targeted
site, and (b) the increase in energy dissipation by the existing U-bolt-type
Friction-brake Devices – which are identified to have performed weakly when
integrated into the structure. A set of parametric investigations have
revealed correlations to achieve the first objective in terms of the
structure's mass, particularly by manipulating the wire-net's
characteristics, and has additionally disclosed the effects of the
impacting-block's parameters. Towards achieving the second objective,
another set of parametric investigations have led to a proposal of a few
innovative improvements in the constitutive behaviour (model) of the studied
brake device (dissipator), in addition to an important recommendation of
careful handling of the device based on the identified potential flaw. |
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