BS EN 1993-4-12007 (Eurocode 3 - Design of steel structures - Part 4-1 Silos) | Cộng đồng Kỹ thuật cơ điện Việt Nam EBOOKBKMT

This European Standard EN 1993-4-1, “Eurocode 3: Design of steel structures – Part 4-1: Silos”, has been prepared by Technical Committee CEN/TC250 « Structural Eurocodes », the Secretariat of which is held by BSI. CEN/TC250 is responsible for all Structural Eurocodes.

This European Standard shall be given the status ofa National Standard, either by publication of an identical text or by endorsement, at the latest by August2007 and conflicting National Standards shall be withdrawn at latest by March 2010.

This Eurocode supersedes ENV 1993-4-1:1999.

Contents

Foreword 4

1 General 9

1.1 Scope 9

1.2 Normative references 9

1.3 Assumptions 10

1.4 Distinction between principles and application rules 10

1.5 Terms and definitions 10

1.6 Symbols used in Part 4.1 of Eurocode 3 13

1.7 Sign conventions 15

1.8 Units 20

2 Basis of design 20

2.1 Requirements 20

2.2 Reliability differentiation 20

2.3 Limit states 21

2.4 Actions and environmental effects 22

2.5 Material properties 22

2.6 Geometrical data 22

2.7 Modelling of the silo for determining action effects 22

2.8 Design assisted by testing 22

2.9 Action effects for limit state verifications 23

2.10 Durability 24

2.11 Fire resistance 24

3 Properties of materials 25

3.1 General 25

3.2 Structural steels 25

3.3 Stainless steels 25

3.4 Special alloy steels 25

3.5 Toughness requirements 26

4 Basis for structural analysis 27

4.1 Ultimate limit states 27

4.2 Analysis of the structure of a shell silo 28

4.3 Analysis of the box structure of a rectangular silo 31

4.4 Equivalent orthotropic properties of corrugated sheeting 32

5 Design of cylindrical walls 35

5.1 Basis 35

5.2 Distinctions between cylindrical shell forms 35

5.3 Resistance of silo cylindrical walls 36

5.4 Special support conditions for cylindrical walls 59

5.5 Detailing for openings in cylindrical walls 64

5.6 Serviceability limit states 65

6 Design of conical hoppers 66

6.1 Basis 66

6.2 Distinctions between hopper shell forms 66

6.3 Resistance of conical hoppers 67

6.4 Considerations for special hopper structures 72

6.5 Serviceability limit states 73

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EN 1993-4-1: 2007 (E)

3

7 Design of circular conical roof structures 75

7.1 Basis 75

7.2 Distinctions between roof structural forms 75

7.3 Resistance of circular conical silo roofs 75

8 Design of transition junctions and supporting ring girders 77

8.1 Basis 77

8.2 Analysis of the junction 80

8.3 Structural resistances 86

8.4 Limit state verifications 90

8.5 Considerations concerning support arrangements for the junction 92

9 Design of rectangular and planar-sided silos 94

9.1 Basis 94

9.2 Classification of structural forms 94

9.3 Resistance of unstiffened vertical walls 95

9.4 Resistance of silo walls composed of stiffened and corrugated plates 95

9.5 Silos with internal ties 100

9.6 Strength of pyramidal hoppers 100

9.7 Vertical stiffeners on box walls 102

9.8 Serviceability limit states 102

Annex A: [Informative] 104

Simplified rules for circular silos in Consequence Class 1 104

A.1 Action combinations for Consequence Class 1 104

A.2 Action effect assessment 104

A.3 Ultimate limit state assessment 104

Annex B: [Informative] 111

Expressions for membrane stresses in conical hoppers 111

Annex C: [Informative] 113

Distribution of wind pressure around circular silo structures 113

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This Eurocode supersedes ENV 1993-4-1:1999.