ДСТУ EN 14272:2022 Фанера. Метод розрахунку деяких механічних властивостей (EN 14272:2011, IDT)



ДСТУ EN 14272:2022
(EN 14272:2011, IDT)

Фанера. Метод розрахунку деяких механічних властивостей

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Foreword

1 Scope

2 Normative references

3 Principle

4 Terms and definitions

5 Symbols

5.1 Main symbols

5.2 Subscripts

6 Calculation method

6.1 General

6.2 Properties relevant to the calculation methods

6.3 Wood species

6.4 Factors for plywood composition

7 Characteristic values for strength and stiffness in bending, tension and compression

7.1 General

7.2 Bending

7.2.1 General

7.2.2 Modulus of elasticity

7.2.3 Strength

7.3 Tension and compression

7.3.1 Stiffness and capacity of the layers in the cross section

7.3.2 Stiffness and capacity of the panel

7.3.3 Property of the panel (as if homogenized)

7.4 Property values for layers

7.4.1 General

7.4.2 Modulus of elasticity (E_m E_b E_c)

7.4.3 Resistance

8 Shear properties

8.1 Panel shear

8.1.1 Panel shear rigidity (G_v)

8.1.2 Panel shear strength (f_v)

8.2 Planar shear

8.2.1 General

8.2.2 Planar shear rigidity (G_r)

8.2.3 Planar shear strength (f_r)

9 Ratio of strength upon modulus

10 Density

11 Conversion from strength and modulus of elasticity to capacity and stiffness

Annex A (normative) Derivation for the veneer values (or basic values)

A.1 Scope

A.2 Principle

A.2.1 Option 1: Using plywood test results

A.2.2 Option 2: Using solid timber properties

A.3 Procedure for derivation of properties from testing plywood

A.3.1 General

A.3.2 Sampling

A.3.3 Test pieces

A.3.4 Testing

A.3.5 Exploitation of the results

A.4 Derivation of estimated values for veneers

A.4.1 General

A.4.2 Values obtained by testing

A.4.3 Imposed values

A.5 Report

Annex B (normative) Practical spreadsheets to derive the properties

B.1 General

B.2 Bending

B.2.1 General

B.2.2 Main tables

B.2.3 Tables for strength values

B.3 Tension and compression

B.4 Panel shear

B.5 Planar shear

B.5.1 General

B.5.2 Available veneer values

B.5.3 Veneer values not available

Annex C (informative) Example of bending strength

C.1 Determination of the stress in the layers

C.2 Determination of the panel strength

Bibliography