IStructe Exam - Quick Steel Details for ExaminationFull description
this is a worksheet showing the calculations for design of steel reinforced earth retaining wall for highway embankmentFull description
AIJ Design Standard for Steel Structures - 2005 eDITIONFull description
This is indian standard code 9178 for purpose of steel bin design
AIJ Design Standard for Steel Structures - 2005 eDITION
thumb rules
steel trussesDescripción completa
design examples
Steel member design according to NZS 3404 - 1997Descripción completa
Structural Steel Design ExamplesFull description
Steel base plate designFull description
Staad Procedure (Steel Design)Full description
STEEL DES
Steel Truss Design
Full description
Calcul des silos en acier selon le règlement eurocode.
DESIGN OF STEEL STRUCTURESDescripción completa
Structural Steel DesignFull description
steel design manualFull description
Full description
I Struct E Part 3 Exam
Steel
Charles Johnson
Load Factors
Design Strength
Section Classification Class 1: Plastic A plastic hinge can be developed with sufficient rotation capacity to allow redistribution of moments within the structure. Py is achieved throughout x-sect. MoR = pyS
PyS
PyZ
Class 2: Compact Moment
Can reach fully plastic MoR but local buckling may prevent development of plastic hinge with sufficient rotation to allow plastic design
Class 3: Semi-compact Can reach py at extreme fibres but local buckling may prevent development of full plastic moment MoR = pySeff
Class 4: Slender Rotation
Moment Rotation Behaviour
Contain elements so slender that local buckling is likely before py occurs at extreme fibres
Single Storey Structures
Portal Frames
Kg/m2
Lattice Girders Roof trusses
Span
Choice of system
Girders & Trusses N-girder or Pratt Truss
Warren girder
Lattice girders 7-11m
<7m 11-17m
17-25m
11-17m
17-25m
25-31m
25-31m
Roof trusses
Scheme sizing
Choice of System
Scheme sizing Beams
Scheme sizing
Columns
Approach A:
Alternative Approach B:
Design for vertical loads only & allow for moments generated in columns by factoring vert loads as follows: Internal column
x 1.25
Perimeter column x 1.5 Corner column
Typ max col sizes for braced frames
x 2.0
Scheme sizing
Struts & Ties
Scheme sizing
Portal Frames Span/eaves height L/H
R
H
Rise/span R/L
L
Watch out for boundary conditions!!!
Horizontal force at base HFR Sizing of Pinned Base Portal Frames
Scheme sizing
Pinned base Portal Frames
Rise/span R/L
Span/eaves height L/H
Mp ratio required for rafter
Scheme sizing
Pinned base Portal Frames
Rise/span R/L
Span/eaves height L/H
Mp ratio required for stanchion
Beam Design Ultimate Strength in Bending
Beam Design
Calculating Mb S275
Mcx
533x210x82
566
5.2
7.0
(Similar tables exist for Grade 355 & UC’s)
5.2
7.0
Beam Design Effective lengths of beam compression flanges
Members in Compression Ultimate Strength Local Capacity Check
Overall buckling check (minor axis failure)
Members in Compression
(Similar tables exist for Grade 355 & CHS’s)
Calculating Pc
Lattice Girders Use diagonals @ 30-60° (ideally 45°) •End diagonals in tension •Use span/depth = 15 •Calculate Mmax (=WL/8 usually)
Top & Bottom Booms •Use same size top/bott booms, ie AT = AB •Axial force = Mmax/d •Under vert download get top chord comp, bolt chord tens •Take care with effective lengths •Top chord usually restrained by purlins •Bottom chord restrained by ties if necessary (uplift). •Watch out for UPLIFT/STRESS REVERSAL •Allow for local bending due to loading between nodes •Comp boom: Max L/ryy = 180 if resisting loads other than wind = 250 if resisting swt and wind only = 350 if usually ties but stress reversal under wind
Deflection
Lattice Girders
•Use compound Ixx = ΣIxx + ΣAy²
Bracings •Size end bracing using PB = R/sin α •Size intermediate bracings by judgement •Take care with effective lengths •Watch out for UPLIFT/STRESS REVERSAL
Purlins & Sheeting Rails
Z min(cm³)
D (mm)
B (mm)
WpL/1800
L/45
L/60
•Use unfactored loads •Span ≤6.5m
RSA
•2 bolts/end •Slope ≤30° •UDL
CHS
WpL/2000
L/65
-
RHS
WpL/1800
L/70
L/150
•Min imposed 0.75kN/m² •Purlins depth D perpr to cladding •Wp
= unfactored load/span (kN) = worst of [dead + imposed] or [wind – dead]
•See code for similar rules for sheeting rails
Vierendeel Girders
Sway Frames under wind/horiz loads
For Composite Steel and Concrete……. ……..the equivalent information is available !! •Span/depth ratios •Span ranges •Preferred primary/secondary beam arrangements •Initial scheming chart •Approx Moment of Resistance calc •Design/detailing of shear connectors •Stiffness/deflection •Decking details •Safe Load Tables
Refer to Scheme Design Publications
Stiffness, Deflection etc
Stiffness, Deflection etc
………and don’t forget dynamics (5Hz)
Connections
Bolted
Grade 8.8 bolts
20
110
91.9
Connections
Welded Use 6mm FW where possible
6.0
6.0
0.903
1.07
Connections •Baseplate details •Column to column •Beam to column •Portal frame details •Beam to beam •Beam to purlin •Column to cladding •Beam restraint •Vertical wind bracing •Horizontal wind bracing
Typical Details
•RHS typical details •RHS & CHS joints •Steel lintels •Rooflights, glazing, gutters •Steel to brickwork •Steel to concrete •Steel to timber •Steel to concrete flooring •Steel to cladding •Etc etc
Corrosion Protection - Information given is typical – there are many alternatives - Table takes no account of fire resistance - Avoid too many schemes on any one job