ISO 22157-2019 pdf free download.Bamboo structures – Determination of physical and mechanical properties of bam boo culms – Test methods.
This document specifies test procedures for specimens obtained from round bamboo culms. The data obtained from the test methods can be used to establish characteristic physical or mechanical properties to be used in structural engineering design or for other scientific purposes. This document provides methods for evaluating the following physical and strength properties: moisture content, density, mass per unit length; strength properties parallel to the fibre direction, compression, tension and bending, and strength properties perpendicular to the fibre direction, tension and bending. It also provides methods to estimate moduli of elasticity in bending, compression and tension parallel to fibres, and bending perpendicular to fibres.
The test methods reported in this document are intended for commercial testing applications. The test methods reported in this document are intended for commercial testing applications and can also be adopted as benchmark methods for scientific research.
This document Is organized to provide requirements for standard tests to be carried out to determine the material properties of full-culm bamboo as a structural material.
2 Normative references
There are no normative references in this document.
3 Terms and defInitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.orgJobp
— IEC Electropedia: available at http/.jwww.e1ectropcdia.org/
3.1 bamboo culm single shoot of bamboo comprised of the entire unaltered bamboo cross-section, which is usually a hollow cylinder except at nodes (3.il)
3.2 bamboo clump clump cluster of bamboo shoots emanating from two or more rhizomes at the same location
5 General requirements
5.1 Temperature and humidity
Unless required by specilic conditioning protocols, test specimens snail ne storea, conaitionea ana tested in an environment having a temperature range of (23 ± 3) °C. and relative humidity range of
(65 ± 5) %.
However, if tests results are to be used in the same environmental conditions in which testing took place, or if the laboratory is unable to follow the standard, storage, conditioning and testing under ambient temperature and relative humidity is permitted. The values of the temperature (±3 °C) and the relative humidity (±5 %) for the laboratory shall be recorded in the test report, alongside the moisture content determined for individual specimens.
5.2 Rate of load application
The rate of load application of the testing machine shall be selected such that failure is reached within (300 ± 120) s. Tests that fail in less than 30 s shall be removed from analysis. The load shall be applied continuously without interruption at the required rate throughout the test. For tests run in displacement control, the rate of traverse of the movable head of the testing machine shall be the free running or no-load speed of the head for mechanical drive type machines, and the loaded head speed for hydraulic or servo-hydraulic driven testing machines. The time to failure for each individual specimen shall be recorded in the test report.
53 Calibration
All apparatus and testing equipment used in obtaining data shall be calibrated at sufficiently frequent intervals to ensure accuracy. A record of errors observed before calibration, the date and time of calibration and observations following calibration shall be maintained.
5.4 Test report
The test report shall include the following information:
a) a reference to this document, i.e. ISO 22157;
b) the name of laboratory, authority or organization which performed the test;
c) the details of the test specimens, as noted in 6,3
6 Sampling and storage of specimens
6.1 Sampling
Sampling should be representative 01 the population which test resuits are intenaea to represent ana be appropriate for the objective of the testing program. Sampling methodology shall be included in the test report.
Bamboo material for any particular species shall be taken:
— in the case of tests on properties for commercial purposes: from a number of different localities, representative of different growth conditions throughout the geographical range of the species;
— in the case of quality control as required in a strength grading protocol or standard: from a randomly selected sample from a batch as required by the protocol or standard.
From each locality, the selection, marking, etc., of the different consignments, as well as all the details of the various clumps and culms, shall be reported.
Culms are to be cut to length taking care to record the provenance of a specimen along the culm in accordance to . For specimens that are to be used to determine bending strength, refer to Clause 12 for minimum lengths.ISO 22157 pdf free download.