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Dynamic testing of steel for a new type of energy absorbing rock bolt
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2006 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 62, no 5, 501-512 p.Article in journal (Refereed) Published
Abstract [en]

Rock bolts of steel are the most frequently used components in systems for rock reinforcement. Special types are used as energy absorbing elements in systems exposed to dynamic loads and these must yield plastically under high loading velocities. A new type of energy absorbing rock bolt of soft steel has been suggested and tested. To investigate the strain rate effects on the yield stress and ultimate strength of the steel were bars dynamically loaded in a high speed testing machine. The observed tensile forces can be divided into one part from impact and another from quasi-static straining. The tests showed that there was a considerable strain rate effect on the yield stress of the steel. It is recommended that higher dynamic yield stresses are utilized in the dynamic design which has to incorporate the risk of high peak forces from impact loading.

Place, publisher, year, edition, pages
2006. Vol. 62, no 5, 501-512 p.
Keyword [en]
rock bolt, energy absorbing, dynamic testing, strain rate effect, different strength, structural-steels, yield strength, strain rate, temperature
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-15480DOI: 10.1016/j.jcsr.2005.08.007ISI: 000235705900009ScopusID: 2-s2.0-30844438128OAI: diva2:333521

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2015-09-21Bibliographically approved

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