[Teach you a trick] Steel structure symbol-Shenyang Century Weiye Steel Structure Co., Ltd

[Teach you a trick] Steel structure symbol

Add time：

2016-09-11

Steel Structure Symbols

1. Design Values of Actions and Action Effects

F - Concentrated load;

H - Horizontal force;

M - Bending moment;

N - Axial force;

P - Pretension force of high-strength bolts;

Q - Gravity load;

R - Support reaction;

V - Shear force.

2. Calculation Indices

E - Modulus of elasticity of steel;

Ec - Modulus of elasticity of concrete;

G - Shear modulus of steel;

Nat - Design value of tensile capacity of an anchor bolt;

Nbt, Nbv, Nbc - Design values of tensile, shear, and bearing capacity of a bolt;

Nrt, Nrv, Nrc - Design values of tensile, shear, and bearing capacity of a rivet;

Ncv - Design value of shear capacity of a shear connector in a composite structure;

Npjt, Npjc - Design values of bearing capacity at pipe joints of tension and compression branch pipes;

Sb - Lateral stiffness of the supporting structure (horizontal force generating a unit tilt angle);

F - Design values of tensile, compressive, and bending strength of steel;

fv - Design value of shear strength of steel;

fce - Design value of end bearing strength of steel;

fst - Design value of tensile strength of reinforcement;

fy - Yield strength (or yield point) of steel;

fat - Design value of tensile strength of anchor bolt;

fbt, fbv, fbc - Design values of tensile, shear, and bearing strength of bolt;

frt, frv, frc - Design values of tensile, shear, and bearing strength of rivet;

fwt, fwv, fwc - Design values of tensile, shear, and compressive strength of butt welds;

fwt - Design values of tensile, shear, and compressive strength of fillet welds;

fc - Design value of compressive strength of concrete;

Δu - Interstory displacement of floors;

[υQ] - Allowable value of deflection considering only the standard value of variable load;

[υT] - Allowable value of deflection considering both permanent and variable load standard values;

σ - Normal stress;

σc - Local compressive stress;

σf - Stress calculated according to the effective section of the weld, perpendicular to the length direction of the fillet weld;

Δσ - Stress amplitude or equivalent stress amplitude for fatigue calculation;

Δσ - Equivalent stress amplitude for variable amplitude fatigue;

[Δσ] - Allowable fatigue stress amplitude;

Σcr, σc.cr, τcr - Critical stress of plate under bending stress, local compressive stress, and shear stress acting separately;

τ - Shear stress;

τf - Shear stress calculated according to the effective section of the weld, along the length direction of the fillet weld;

ρ - Mass density.

3. Geometric Parameters

A - Gross sectional area;

An - Net sectional area;

H - Height of column;

H1, H2, H3 - Heights of upper, middle (or lower for single-stage columns), and lower sections of stepped columns;

I - Gross section moment of inertia;

It - Gross section torsional moment of inertia;

Iw - Gross section sectorial moment of inertia;

In - Net section moment of inertia;

S - Gross section modulus;

W - Gross section modulus;

Wn - Net section modulus;

Wp - Plastic gross section modulus;

Wpn - Plastic net section modulus;

ag - Spacing, gap;

b - Width of plate or free cantilever width of plate;

bo - Unsupported width of flange plate between webs of box section; width of top of concrete plate support;

bs - Cantilever width of stiffener;

be - Effective width of plate;

d - Diameter;

de - Effective diameter;

do - Hole diameter;

e - Eccentricity;

h - Full section height; floor height;

hc1 - Thickness of concrete plate;

hc2 - Thickness of concrete plate support;

he——Calculated thickness of fillet weld;

hf——Weld leg size of fillet weld;

hω——Height of the web;

ho——Calculated height of the web;

i——Radius of gyration;

l——Length or span;

ll——Distance between lateral supports of the compressed flange of the beam; connection length in the direction of bolt (or rivet) force;

lo——Calculated length for bending buckling;

lω——Calculated length for torsional buckling;

lw——Calculated length of weld;

lz——Assumed distribution length of concentrated load on the edge of the calculated height of the web;

s——Shortest distance from the root of the partially welded butt joint to the surface of the weld;

t——Thickness of the plate; thickness of the main pipe wall;

ts——Stiffener thickness;

tw——Thickness of the web;

α——Included angle;

θ——Included angle; stress diffusion angle;

γb——General height-thickness ratio for bending calculation of beam web;

γs——General height-thickness ratio for shear calculation of beam web;

γc——General height-thickness ratio for local pressure calculation of beam web;

γ——Slenderness ratio;

γo、γyz、γz、γuz——Equivalent slenderness ratios,

4、Calculation coefficients and others

C——Dimensionless parameter used for fatigue calculation,

K1K2——Ratio of member line stiffness;

ks——Shear buckling coefficient of member;

Ov——Branch pipe lap rate of pipe node;

n——Number of bolts, rivets or connectors; number of stress cycles:

nl——Number of bolts (or rivets) on the calculated section;

nf——Number of high-strength bolt friction surfaces;

nv——Number of shear surfaces of bolts or rivets;

α——Coefficient of linear expansion; coefficient for calculating the lateral force caused by crane swing,

αE——Ratio of elastic modulus of steel to concrete;

αe——Reduction coefficient of beam section modulus considering the effective width of the web;

αf——Equivalent coefficient of underload effect for fatigue calculation;

αo——Stress distribution unevenness coefficient of column web;

αy——Steel strength influence coefficient;

αl——Coefficient used when the beam web is planed and tightened;

α2i——Coefficient of lateral displacement moment increase of the member of the ith layer frame considering the second-order effect;

β——Ratio of branch pipe outer diameter to main pipe outer diameter; parameter used to calculate fatigue strength;

βb——Equivalent critical bending moment coefficient for overall stability of beam;

βf——Increase coefficient of design value of strength for front fillet weld;

βm、βt——Equivalent bending moment coefficients for stability of compression bending members:

βl——Increase coefficient of design value of strength for equivalent stress;

γ——Steel strength to yield strength ratio of bolt;

γo——Importance coefficient of structure:

γx、γy——Section plastic development coefficients for the main axes x and y;

η——Adjustment coefficient;

ηb——Asymmetry influence coefficient of beam section;

η1、η2——Parameters used to calculate the calculated length of stepped columns;

μ——Coefficient of anti-slip of high-strength bolt friction surface; coefficient of calculated length of column;

μ1、μ2、μ3——Coefficient of calculated length of upper, middle (or lower for single-stepped column), and lower sections of stepped column;

ξ——Parameter used to calculate the overall stability of the beam;

ρ——Effective width coefficient of web under compression;

φ——Stability coefficient of axially compressed member;

φb、φ’b——Overall stability coefficient of beam;

ψ——Increase coefficient of concentrated load;

ψn、ψa、ψd——Parameters used to calculate the bearing capacity of directly welded steel pipe nodes.