Flat Ring Flexure Test for Full-Culm Bamboo


Flat Ring Flexure Test for Full-Culm Bamboo

J. Virgo, R. Moran, K. Harries, J.J. Garcia, S. Platt

Abstract. The development of a new simple test method suitable for assessing the tension strength perpendicular to the fibres (Mode I) of a bamboo culm – the flat ring flexure test – is presented. The proposed test places a short section of bamboo culm in through-cross section flexure, causing circumferential stresses at failure. The modulus of rupture at the failed section is a measure of the transverse tensile strength of the culm. The test is compression-based (indeed, in the field it can be run using free weights rather than a test machine) and uses a simple apparatus and specimen. The full culm specimen is symmetric and requires very little preparation. The study first investigated test parameters affecting results, thereby arriving at an appropriate and repeatable standard test method. The resulting test method is documented in a format consistent with ISO 22157 [1].

Bamboo, Tension Perpendicular to Fibre, Test Method

Published online , 10 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: J. Virgo, R. Moran, K. Harries, J.J. Garcia, S. Platt, ‘Flat Ring Flexure Test for Full-Culm Bamboo’, Materials Research Proceedings, Vol. 7, pp 349-358, 2018

DOI: http://dx.doi.org/10.21741/9781945291838-32

The article was published as article 32 of the book Non-Conventional Materials and Technologies

[1] International Organisation for Standardisation (ISO) (2017) CD22157, Bamboo structures – Determination of physical and mechanical properties of bamboo culms – Part 1: Test methods. Committee Document, Geneva.
[2] International Organisation for Standardisation (ISO) (2004a) ISO 22157-1:2004(E), Bamboo – Determination of Physical and Mechanical Properties – Part I: Requirements. Geneva.
[3] International Organisation for Standardisation (ISO) (2004b) ISO 22156:2004(E), Bamboo – Structural Design. Geneva.
[4] Janssen, J.A. (2005) International Standards for Bamboo as a Structural Material. Structural Engineering International, 15, 48-49. https://doi.org/10.2749/101686605777963288
[5] Janssen, J. (1981) Bamboo in Building Structures. Doctoral Dissertation, Eindhoven University of Technology, Netherlands.
[6] Sharma, B. (2010) Performance Based Design of Bamboo Structures. Doctoral Dissertation, University of Pittsburgh.
[7] Richard, M., Gottron, J., Harries, K.A. and Ghavami. K. (2017) Experimental Evaluation of Longitudinal Splitting of Bamboo Flexural Components, ICE Structures and Buildings Themed issue on bamboo in structures and buildings, 170 (4), 265-274.
[8] Mitch, D., Harries, K.A., and Sharma, B. (2010) Characterization of Splitting Behavior of Bamboo Culms. ASCE Journal of Materials in Civil Engineering, 22, 1195-1199. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000120
[9] Sharma, B., Harries, K.A. and Ghavami, K. (2012) Methods of Determining Transverse Mechanical Properties of Full-Culm Bamboo, Journal of Construction and Building Materials, 38, 627-637. https://doi.org/10.1016/j.conbuildmat.2012.07.116
[10] Moran, R., Webb, K., Harries, K.A. and Garcia, J.J. (2017) Edge Bearing Tests to Characterize the Radial Gradation of Bamboo, Journal of Construction and Building Materials, 131, 574-584. https://doi.org/10.1016/j.conbuildmat.2016.11.106
[11] Sharma, B. and Harries, K.A. (2011) Effect of Fiber Gradation on the Edge Bearing Strength of Bamboo Culms. Proceedings of the 13th International Conference on Non-conventional Materials and Technologies (IC-NOCMAT 2011), Changsha, Hunan, China, September 2011.
[12] ASTM (2016) ASTM E178-16a Standard Practice for Dealing with Outlying Observations, ASTM International, West Conshohocken PA, USA