1.0.1 This code is formulated with a view to improving the design level of steel structures in port engineering, achieving advanced technology, economy and rationality, safety and usability, and effectively controlling engineering quality.
1.0.2 This code is applicable to the design of hydraulic steel structures in port engineering; the design of other steel structures in port engineering may refer to it.
1.0.3 This code is formulated according to the relevant requirements of the current national standard "Unified Standard of Reliability of Structural Design for Harbour Engineering" (GB 50158) and shall be used in match with other standards of port engineering formulated according to the same standard.
1.0.4 The design of steel structures in port engineering shall not only comply with this code, but also those in the current relevant ones of the nation.
2 Symbols
A——the gross sectional area
An——the net sectional area
a——the spacing
b——the plate width or free overhung width of plate
b0——the width of box section flange plate between web plates
bs——the overhung width of stiffening rib
C——the dimension parameter for fatigue calculation
d——the diameter
d0——the hole diameter
de——the effective diameter
E——the elasticity modulus of steels
f——the design value of tensile, compressive and bending strength of steels
F——the concentrated load
fce——the design value of end face bearing strength of steels
f ——the design value of tensile, shear and compressive strength of fillet weld
f ——the design value of tensile strength of anchor
, , ——the design values of tensile, shear and bearing strength of bolt
, , ——the design values of tensile, shear and bearing strength of rivet
, , ——the design values of tensile, shear and compressive strength of butt weld
fv——the design value of shear strength of steels
fy——the yield strength of steels
G——the shear modulus of steels
h——the section height
h0——the calculation height of web plate
he——the effective thickness of fillet weld
hf——the dimension of fillet weld leg
i——the gyration radius of section
I——the inertia moment of gross section
In——the inertia moment of net section
l——the geometrical length of member
L——the span
l0——the calculation length of member
lw——the calculation length of weld
lz——the assumed distribution length of concentrated load on web plate calculation height edge
Mx, My——the design value of bending moment around x-axis and y-axis for calculated section
N——the design value of axial tensile force or axial compressive force
NE——the Euler critical force
N ——the design value of tensile capacity of each anchor
, , ——the design values of tensile, shear and compressive capacity of each bolt
, , ——the design values of tensile, shear and compressive capacity of each rivet
N ——the design value of shear capacity of each connection piece
n——the number of bolt, rivet or connection piece
nv——the number of shear plane of bolt or rivet
P——the pretension of high strength bolt
R——the support counter force
S——the area moment of gross section above calculated shear stress for neutral axis
t——the plate thickness
ts——the thickness of stiffening rib
tw——the thickness of web plate
V——the design value of shear force acted by calculated section along web plate plane
W1x——the resisting moment of gross section of larger compression fibre in the bending moment acting plane
Wnx, Wny——the resisting moments of net section to x-axis and y-axis
Wx, Wy——the resisting moments of gross section to x-axis and y-axis determined according to compression fibre
a——the coefficient of linear expansion, reduction coefficient
a0——the nonuniformity coefficient of stress distribution of compression-bending member web plate
β——the parameter for calculating fatigue strength, reduction coefficient
βb——the equivalent bending moment coefficient of integral stability of beam
βf——the enhancement coefficient of design value of strength for front fillet weld
βmx, βtx——the equivalent bending moment coefficients inside and outside acting plane of compression-bending member stability moment
ηb——the unsymmetrical influence coefficient of beam section
λ——the slenderness ratio
λ0——the conversion slenderness ratio
η——the influence coefficient of normal bending stress for partial stability of beam web plate
μ——the antiskid coefficient of friction surface of high strength bolt
ξ——the parameter for calculating integral stability of beam
ρ——the mass density
σ——the normal stress
σf——the stress calculated according to effective section and vertical to the length direction of fillet weld
τ——the shear stress
τf——the shear stress along the length direction of fillet weld
φ——the stability coefficient of axial compression member
φb, φ'b——the integral stability coefficient of beam
3 General Requirements
3.0.1 For the design of steel structures, the materials and schemes for the structures shall be reasonably selected based on the actual situation of the engineering, and the proper constructional measures shall be taken.
3.0.2 The design of steel structures shall meet the requirements of structure strength, stability, rigidity and corrosion protection as well as transport and installation conditions.
3.0.3 The design of steel structures shall first adopt shaped and standardized structures and members so as to reduce fabrication and installation work quantity.
3.0.4 The design drawings of steel structures and steel order documents shall indicate additional guarantee items such as steel grade, type, required mechanical performance and chemical composition of steels and connecting materials.
3.0.5 The design drawings of steel structures shall indicate the weld quality grade. The inspection of weld quality shall meet the relevant requirements of the current national standard "Code for Construction and Acceptance of Steel Structure Engineering" (GB 50205).
3.0.6 For new and large steel structure engineering, special research shall be carried out if necessary.
