Investigation of a combined failure mode for screw anchors under tension
| Autor: | Anthony Lamanna, Somayeh Nassiri, Zhao Chen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Breakout
Materials science business.industry Tension (physics) 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction Structural engineering 0201 civil engineering Capacity design 021105 building & construction Ultimate tensile strength business Failure mode and effects analysis Civil and Structural Engineering |
| Zdroj: | Advances in Structural Engineering. 23:2803-2812 |
| ISSN: | 2048-4011 1369-4332 |
| Popis: | A modified concrete capacity design method is available to predict the ultimate tensile strength ( Nu) of screw anchors. Screw anchors commonly fail in a combination of concrete breakout and pullout modes. This combined mode is not distinguished from the breakout mode in the modified concrete capacity design method, which may cause confusions to designers. To investigate the Nu of the combined mode ( Ncomb), this study included 144 unconfined tension tests on screw anchors from three manufacturers in three diameters and two effective embedment depths ( hef) per diameter. Approximately 80% of the tested anchors failed in the combined mode. The differences in Ncomb among the three manufacturers were insignificant despite their varied thread design. Ncomb was found to be linearly correlated to the parameter hef 1.3 but was found independent of the anchor diameter. A regression model was developed to specifically predict Ncomb. The model showed a good fit with the test results. |
| Databáze: | OpenAIRE |
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