[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 symbol

1, the role and effect of the design value

F——concentrated load;

H - horizontal force;

M——bending moment;

N——axial force;

P——pre-tension of high-strength bolts;

Q——gravity load;

R——bearing reaction force;

V - shear force.

2, calculation indicators

E - the modulus of elasticity of the steel;

Ec——the elastic modulus of concrete;

G - the shear modulus of the steel;

Nat——the design value of the tensile bearing capacity of an anchor bolt;

Nbt, Nbv, Nbc - design values for tensile, shear and compressive bearing capacity of a bolt;

Nrt, Nrv, Nrc - design values for tensile, shear and compressive bearing capacity of a rivet;

Ncv—the design value of the shear capacity of a shear joint in a composite structure;

NpjtNpjc - the design value of the bearing capacity of the tensioned and compressed branch pipe at the pipe joint;

Sb——the lateral displacement stiffness of the support structure (the horizontal force generating the unit roll angle);

F —— the design values of tensile, compressive and flexural strength of steel;

Fv——the design value of the shear strength of the steel;

Fce——the design value of the end face compressive strength of the steel;

Fst——the tensile strength design value of the steel bar;

Fy——the yield strength (or yield point) of the steel;

Fat - the design value of the tensile strength of the anchor;

Fbtfbvfbc - the design value of the tensile, shear and compressive strength of the bolt;

Frtfrvfrc - design values for tensile, cold shear and compressive strength of rivets;

Fwtfwvfwc - design values for tensile, shear and compressive strength of butt welds;

Fwt - the design values of tensile, shear and compressive strength of fillet welds;

Fc - design value of concrete compressive strength;

Δu - the interlayer displacement of the floor;

[υQ] - only allow for the allowable value of the deflection generated by the variable load standard value;

[υT]—Also considers the allowable value of the deflection produced by the permanent and variable load standard values;

σ - normal stress;

Σc——local compressive stress;

Σf——the stress calculated perpendicular to the length of the fillet weld and calculated according to the effective section of the weld;

Δσ——the stress amplitude or the calculated stress amplitude calculated by fatigue;

Δσ——the equivalent stress amplitude of variable amplitude fatigue;

[Δσ]——Fatigue allowable stress amplitude;

Σcrσc.crτcr——the critical stress of the plate when bending stress, local compressive stress and shear stress act alone;

τ - shear stress;

Τf——the shear stress calculated according to the length of the fillet weld according to the effective section of the weld;

ρ - mass density.

3, geometric parameters

A - the cross-sectional area of the hair;

An - net cross-sectional area;

H——the height of the column;

H1, H2, H3 - the height of the upper section of the stepped column, the middle section (or the lower section of the single-stage column), and the lower section;

I - the moment of inertia of the hair section;

It——the torsional moment of inertia of the wool section;

Iw——the fan-shaped moment of inertia of the hair section;

In——net section moment of inertia;

S - the cross-sectional area moment of the hair;

W - the modulus of the hair section;

Wn - net section modulus;

Wp——plastic capillary section modulus;

Wpn - plastic net section modulus;

Ag - spacing, clearance;

B——the width of the plate or the free extension of the plate;

Bo—the unsupported width of the box section flange panel between the webs; the width of the top of the concrete panel bracket;

Bs - the overhang width of the stiffener;

Be——the effective width of the plate;

d - diameter;

De - effective diameter;

Do——aperture;

e - eccentricity;

h ——full cross section; floor height;

Hc1 - the thickness of the concrete slab;

Hc2——the thickness of the concrete support;

He—the calculated thickness of the fillet weld;

Hf——the size of the fillet of the fillet weld;

Hω - the height of the web.

Ho - the calculated height of the web;

i —— section radius of gyration;

l - length or span;

Ll - the distance between the lateral support of the compression flange; the connection length of the bolt (or rivet) in the direction of force;

Lo——the calculated length of the bending buckling;

Lω - the calculated length of torsional buckling;

Lw - the calculated length of the weld;

Lz - the assumed distribution length of the concentrated load on the calculated height edge of the web;

S—the shortest distance from the root of the butt weld to the surface of the weld;

T——the thickness of the plate; the thickness of the main pipe;

Ts - stiffener thickness;

Tw - the thickness of the web;

α - the angle;

θ - angle; stress diffusion angle;

Γb——the general height-to-thickness ratio when the web of the beam is bent;

Γs——the general height-to-thickness ratio of the beam web when it is sheared;

Γc——the general height-to-thickness ratio of the beam web when calculated by local pressure;

γ - length to fine ratio;

Γo, γyz, γz, γuz—converted slenderness ratio,

4, calculation coefficient and other

C - a dimensional parameter for fatigue calculations,

K1K2 - the ratio of the stiffness of the component line;

Ks——the shear flexion coefficient of the member;

Ov——the branching ratio of the pipe joints of the pipe joints;

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

Nl - the number of bolts (or rivets) on the calculated section;

Nf——the number of force-transmitting friction surfaces of high-strength bolts;

Nv - the number of shear faces of the bolt or rivet;

————linear expansion coefficient; calculate the coefficient of lateral force caused by the swing of the crane,

αE——the ratio of the elastic modulus of steel to concrete;

Αe——the section modulus of the beam takes into account the reduction factor of the effective width of the web;

Ff——the equivalent coefficient of underload effect of fatigue calculation;

Αo——the uneven distribution of the stress distribution of the column web;

Yy——the influence coefficient of steel strength;

Ll——the coefficient used when the beam web is flattened;

22i——considering the second-order effect frame; the lateral bending moment increasing coefficient of the layer member;

β - the ratio of the branch pipe to the outer diameter of the main pipe; parameters used to calculate the fatigue strength;

Bb——the equivalent critical moment coefficient of the overall stability of the beam;

Ff——the increase factor of the strength design value of the front fillet weld;

Mm, βt——the equivalent bending moment coefficient of the compression-bending member:

Ll——the strength of the converted stress is set to increase the juice value;

γ - the yield ratio of stud steel;

Γo - the importance coefficient of the structure:

Γx, γy——the plastic development coefficient of the section of the main axis x, y;

Η——adjustment factor;

Ηb——symmetric influence coefficient of beam section;

Η1, η2 - parameters used to calculate the calculated length of the stepped column;

Μ——the anti-slip coefficient of the friction surface of the high-strength bolt; the calculated length coefficient of the column;

1、1, μ2, μ3—the calculated length factor of the upper section of the stepped column, the middle section (or the lower section of the single-stage column), and the lower section;

ξ - the parameters used to calculate the overall stability of the beam;

Ρ——the effective width coefficient of the compression zone of the web;

Φ——the stability factor of the axial compression member;

Φb, φ'b——the overall stability factor of the beam;

ψ - the increase factor of concentrated load;

Ψn, ψa, ψd - parameters used to calculate the bearing capacity of directly welded steel pipe joints.