ISO 22157:2019

Overview

ISO 22157:2019 - "Bamboo structures - Determination of physical and mechanical properties of bamboo culms - Test methods" defines standardized test methods for specimens taken from round bamboo culms. The standard provides procedures to obtain reliable material properties (physical and mechanical) that support structural engineering design, commercial testing, and scientific research. ISO 22157:2019 supersedes the earlier ISO 22157‑1:2004 and was prepared by ISO/TC 165 (Timber structures).

Key topics and requirements

ISO 22157:2019 organizes test methods and general requirements to ensure consistent, reproducible results. Major technical topics include:

• Sampling and specimen preparation
  • Requirements for felling, marking, selection, storage and conversion of full‑culm bamboo to test specimens.
• Environmental and calibration controls
  • Conditions for temperature, humidity, load rate and calibration of test equipment.
• Physical property tests
  • Moisture content (oven‑dry method; electrical moisture meter method).
  • Density and mass per unit length procedures.
• Mechanical property tests parallel to fibres
  • Compression, tension, bending, and shear strength tests; methods to estimate modulus of elasticity in compression, tension and bending.
• Mechanical property tests perpendicular to fibres
  • Tension and bending tests perpendicular to fibre direction, with stiffness estimation.
• Test reporting
  • Standardized requirements for reporting test conditions, calculations and results to support use in design or research.

The document is oriented to commercial testing applications while serving as benchmark methods for scientific studies.

Practical applications

ISO 22157:2019 is essential for anyone who needs validated bamboo material data for structural use:

• Producing characteristic strength values and stiffnesses for design of bamboo buildings, bridges, or load‑bearing elements.
• Quality control and certification labs performing commercial bamboo testing.
• Researchers comparing mechanical behavior of different bamboo species, treatments, or manufacturing methods.
• Engineers developing design codes, structural models, or finite element analyses that require reliable bamboo material properties.

Who should use this standard

• Structural engineers and architects working with bamboo structures.
• Material testing laboratories and certification bodies.
• Academic and industrial researchers in bamboo material science.
• Manufacturers of engineered bamboo products seeking standardized property data.

Related information

• This is the first edition of ISO 22157:2019 and replaces ISO 22157‑1:2004.
• Prepared by ISO/TC 165 (Timber structures). Use the standard as a benchmark to harmonize bamboo testing and support consistent, code‑ready material data for bamboo structures.

Keywords: ISO 22157:2019, bamboo structures, bamboo culms, test methods, mechanical properties, moisture content, density, modulus of elasticity, structural engineering.