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BSI 23/30443614 DC:2023 Edition

BSI 23/30443614 DC:2023 Edition

$13.70

BS EN 1993-1-7. Eurocode 3. Design of steel structure – Part 1-7. Plate assemblies with elements under transverse loads

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BSI 2023 77
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1.1 Scope of prEN 1993-1-7 (1) prEN 1993-1-7 provides rules for the structural design of assemblies of unstiffened and stiffened steel plates whose elements are under predominantly distributed transverse loads. (2) prEN 1993-1-7 is applicable to containment structures such as silos, tanks, digesters and lock gates, where the external actions chiefly act transversely on their individual plates or panels. Where a plate or panel under bending is additionally subject to membrane forces that have a significant effect on the resistance, this document covers assessment of the resistance through its computational analysis procedures. (3) prEN 1993-1-7 is applicable to structures with rectangular, trapezoidal or triangular component plate segments, each with one axis of symmetry. (4) prEN 1993-1-7 does not apply to plates or panels where the dominant structural resistance requirement relates to membrane forces in the plates (for these, see EN 1993-1-5). (5) prEN 1993-1-7 does not apply to plates or panels whose curvature (out of flatness) exceeds that defined in 1.1 (14). For such curved plates, see EN 1993-1-6. (6) prEN 1993-1-7 does not apply to circular or annular plates. For such plates, see EN 1993 1-6. (7) prEN 1993-1-7 does not apply to cold-formed sheeting. For such plates, see EN 1993-1-3. (8) This document is only concerned with the requirements for design of plates and plate assemblies against the ultimate limit states of: – plastic failure; – cyclic plasticity; – buckling; – fatigue. (9) Overall equilibrium of the structure (sliding, uplifting, or overturning) is not included in this document. Special considerations for specific applications are available in the relevant applications parts of EN 1993. (10) The rules in this document refer to plate assemblies that are fabricated using unstiffened or stiffened plates or panels. The document is also applicable to the design of individual plates or panels that are predominantly subject to actions transverse to the plane of each plate. Both frictional actions on the plate surface and forces imposed by adjacent components of the plate assembly also induce in-plane actions in each plate. (11) This document gives algebraic rules and guidance to account for bending with small membrane forces in the individual plates or panels. Where an unstiffened or stiffened plates or panels is subject to significant magnitudes of both bending and in-plane forces, the computational analysis procedures of this document apply. (12) Where no application part defines a different range, this document applies to structures within the following limits: – design metal temperatures within the range −50 °C to +100 °C; – the geometry of individual plate segments is limited to rectangular, triangular and trapezoidal shapes with b/t greater than 20, or b1/t greater than 20, as appropriate (see Figure 3.2); – Single plate elements are treated as flat where the deviation from flatness e0 meets the condition (see Figure 9.1). Where this criterion is not met, it is appropriate to treat the plate as a shell panel (see EN 1993-1-6). 1.2 Assumptions (1) Unless specifically stated, the provisions of EN 1990, EN 1991 (all parts) and EN 1993 (all parts) apply. (2) The design methods given in prEN 1993-1-7 are applicable if: – the execution quality is as specified in EN 1090 2, and – the construction materials and products used are as specified in the relevant parts of EN 1993 (all parts), or in the relevant material and product specifications. (3) The provisions in this document apply to materials that satisfy the brittle fracture provisions given in EN 1993-1-4 and EN 1993-1-10. (4) In this document, it is assumed that wind loading, seismic actions and bulk solids flow can, in general, be treated as quasi-static actions. …

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PDF Pages PDF Title
10 1 Scope
1.1 Scope of prEN 1993-1-7
11 1.2 Assumptions
2 Normative references
3 Terms, definitions and symbols
12 3.1 Terms and definitions
3.1.1 Structural forms and geometry
15 3.1.2 Failure mechanisms
16 3.1.3 Actions
3.1.4 Terms for analysis treatments
17 3.2 Symbols
20 4 Basis of design
4.1 General
21 4.2 Reliability management
4.3 Design values of geometrical data
4.4 Geometrical tolerances and geometrical imperfections
4.5 Durability
4.6 Verification by the partial factor method
22 5 Materials and geometry
5.1 Material properties
23 6 Structural analysis
6.1 Types of analysis
6.1.1 General
24 6.1.2 Membrane and simple bending analysis (MSBA)
6.1.3 Linear elastic structural analysis (LA)
6.1.4 Linear elastic bifurcation analysis (LBA)
6.1.5 Geometrically nonlinear elastic analysis (GNA)
25 6.1.6 Materially nonlinear analysis (MNA)
6.1.7 Geometrically and materially nonlinear analysis (GMNA)
6.1.8 Geometrically and materially nonlinear analysis with imperfections included (GMNIA)
26 6.2 Modelling of a plate assembly
6.2.1 General
6.2.2 Plate assembly
27 6.2.3 Treatment of individual plates or panels
6.2.4 Boundary conditions
29 6.2.5 Modelling of plate junctions
6.3 Modelling of actions and environmental influences
6.4 Simplified analysis methods for plate assemblies under general loads
6.4.1 General
33 6.4.2 Pyramidal assemblies
34 6.5 Analysis of individual plates or panels
6.5.1 General
6.5.2 Analysis of unstiffened plates or panels
35 6.5.3 Analysis of uni-directionally stiffened plate or panels
37 6.5.4 Analysis of bi-directionally stiffened plates or panels
6.6 Analysis by computational modelling
38 7 Ultimate limit states for plate assemblies
7.1 General
7.2 Plastic failure limit state (LS1)
7.3 Cyclic plasticity limit state (LS2)
39 7.4 Buckling limit state (LS3)
7.5 Fatigue limit state (LS4)
40 8 Ultimate limit state design of unstiffened plates
8.1 General
8.2 Plastic failure limit state (LS1)
8.2.1 General
41 8.2.2 Design values of resistance
8.2.3 Stress-based design
42 8.2.4 Simple design for one-way bending
43 8.2.5 Design using standard elastic formulae
8.2.6 Design using standard plastic formulae
8.2.7 Design using global computational analysis
8.2.7.1 Linear-elastic global computational analysis
8.2.7.2 Nonlinear global computational analysis
44 8.3 Cyclic plasticity limit state (LS2)
8.3.1 General
8.3.2 Stress-based design
45 8.3.3 Design using global computational analysis – accumulated strains
46 8.4 Buckling limit state (LS3)
8.4.1 General
8.4.2 Design using buckling formulae
8.4.3 Design by global computational analysis
47 8.5 Fatigue limit state (LS4)
9 Ultimate limit state design of uni-directionally stiffened plates
9.1 General
9.2 Plastic failure limit state (LS1)
9.2.1 Stress-based design
48 9.2.2 Design using global computational analysis
9.2.2.1 Linear-elastic global computational analysis
49 9.2.2.2 Nonlinear global computational analysis
9.3 Cyclic plasticity limit state (LS2)
9.4 Buckling limit state (LS3)
9.4.1 General
50 9.4.2 Design of the stiffener and adjacent plate using buckling formulae
9.4.3 Design of the stiffener and adjacent plate using computational analysis
51 9.5 Fatigue limit state (LS4)
52 10 Ultimate limit state design of bi-directionally stiffened plates
10.1 General
10.2 Stress-based design
53 10.3 Design using computational analysis
54 Annex A (informative) Membrane and simple elastic bending analysis stress resultants in plates and plate assemblies
A.1 Use of this Annex
A.2 Scope and field of application
56 A.3 Symbols
A.4 Simplified treatment
57 A.5 Simple formulae for SMBT treatment of a rectangular plate assembly
58 A.6 Simple formulae for SMBT treatment of pyramidal hopper plate assemblies
61 Annex B (informative) Formulae for linear elastic stresses in unstiffened rectangular plates from small deflection theory
B.1 Use of this Annex
B.2 Scope and field of application
62 B.3 Symbols
B.4 Characterization of stresses
63 B.5 Rectangular plates under uniform pressure
B.5.1 Boundary conditions
64 B.5.2 Stress descriptors
B.5.3 Stresses for SCA: FFFF
65 B.5.4 Stresses for SCB: SSSS
B.5.5 Stresses for SCC: FFFS
66 B.5.6 Stresses for SCD: SFFS
B.6 Trapezoidal and triangular plates under uniformly distributed pressure
B.6.1 General
B.6.2 Boundary conditions
67 B.6.3 Stress descriptors
B.6.4 Stresses for SCA: FFFF
68 B.6.5 Stresses for SCB: SSSS
B.7 Rectangular plates under linearly varying pressure from the top to the bottom
B.7.1 General
B.7.2 Boundary conditions
B.7.3 Stress descriptors
69 B.7.4 Stresses for SCA: FFFF
70 B.7.5 Stresses for SCB: SSSS
B.7.6 Stresses for SCC: FFFS
71 B.7.7 Stresses for SCD: SFFS
72 Annex C (informative) Formulae for the plastic reference resistances of unstiffened individual plates and plate assemblies
C.1 Use of this Annex
C.2 Scope and field of application
C.3 General
C.3.1 Geometries of individual plates
73 C.3.2 Load conditions covered in this Annex
C.3.3 Boundary conditions for individual plates
74 C.4 Rectangular plates under uniform pressure
C.4.1 Geometry and loading
C.4.2 Plastic reference resistances under uniform pressure
75 C.5 Rectangular plates under linear variation of pressure
C.5.1 General
C.5.2 Plastic reference resistances under linear pressure variation
76 C.6 Rectangular plates under Janssen pressure variation
C.6.1 General
C.6.2 Plastic reference resistances under Janssen pressure variation

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