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Practical Steel Connection Software Design Using AISC 2010 Standard
Including:Practical Advice for Reviewing Software
Generated Connection Designs
Steve Ashton, P.E., SECB
Bolt Materials
Group A: (Includes A325 and F1852)Fu = 120 ksi *
Group B: (Includes A490 and F2280)Fu = 150 ksi
(* ‐ up to 1” diameter)
4
Allowable Shear Strength
1989 2005 2010A325N 21 ksi 24 ksi 27 ksiA325X 30 ksi 30 ksi 34 ksiA490N 28 ksi 30 ksi 34 ksiA490X 40 ksi 37.5 ksi 42 ksi
5
Slip Critical Joints ‐ 2005 SpecificationRn = μDuhscTbNs (J3‐4)
Prevention of Slip is a Serviceability Limit StateLRFD: = 1.00ASD: = 1.50
Prevention of Slip at Required Strength LevelLRFD: = 0.85ASD: = 1.76
9
Rn = μDuhscTbNs (2005 ‐ J3‐4)
= 0.35 (Class A) = 0.50 (Class B)
Rn = μDuhfTbNs (2010 ‐ J3‐4)
= 0.30 (Class A) = 0.50 (Class B)
Slip Critical Joints
10
Rn = μDuhscTbNs (2005 ‐ J3‐4)
hsc = 1.00 (STD)hsc = 0.85 (OVS or SSL)hsc = 0.70 (LSL)
Rn = μDuhfTbNs (2010 ‐ J3‐4)
= 1.00 (STD) = 0.85 (OVS or SSL) = 0.70 (LSL)
Slip Critical Joints
11
Slip Critical Joints ‐ 2010 Specification
Rn = μDuhfTbNs (J3‐4)
hf = 1.00 (0 or 1 Filler)hf = 0.85 (2 or more Fillers)
12
Other 14th Ed. Changes• Prying Action• Single Plate Shear Connections (Shear Tabs)• Fillers• New Tables
15
Other 14th Ed. Changes
• Prying Action• Single Plate Shear Connections (Shear Tabs)• Fillers• New Tables
16
17
Prying Action (ASD)
With prying action:
T = required strength per boltp = tributary length per bolt line ≤ 2b = 1‐ d’ / pd’ = width of hole along length of fitting
)'1('4
min
upF
Tbt
Other 14th Ed. Changes
• Prying Action• Single Plate Connections (Shear Tabs)• Fillers• New Tables
24
Single‐Plate Connection
Conventional Configuration
13th Edition Manualtp or tw ≤ d/2 + 1/16”
14th Edition ManualNo requirement if n ≤ 5 and SSLT
27
Single‐Plate Connection
Conventional Configuration
13th Edition ManualEccentricity can be ignored if:
n ≤ 9 and STD or n ≤ 12 and SSLT
14th Edition ManualEccentricity always considered per Table 10‐9
28
Other 14th Ed. Changes• Prying Action• Single Plate Shear Connections (Shear Tabs)• Fillers• New Tables
29
Other 14th Ed. Changes• Prying Action• Single Plate Shear Connections (Shear Tabs)• Fillers• New Tables
34
14th Edition Manual
New Tools• Table 8‐12. Approx. Number of Passes for Welds• Table 10‐13. Min. Inside Radius for Cold‐Bending• Table 10‐14. Clearances for Skewed Connections• Table 10‐15. Seated Connections to HSS
35
14th Edition Manual
New Tools• Table 8‐12. Approx. Number of Passes for Welds• Table 10‐13. Min. Inside Radius for Cold‐Bending• Table 10‐14. Clearances for Skewed Connections• Table 10‐15. Seated Connections to HSS
36
14th Edition Manual
New Tools• Table 8‐12. Approx. Number of Passes for Welds• Table 10‐13. Min. Inside Radius for Cold‐Bending• Table 10‐14. Clearances for Skewed Connections• Table 10‐15. Seated Connections to HSS
38
Practical Steel Connection Software Design Using AISC 2010 Standard
Practical Advice for Reviewing Software Generated Connection
Designs
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
42
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
43
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
44
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
51
54
Column Forces
Beam forces
Where
and
PreP
rV c
c cH
PreP
rH b
b bV
22bc eer
Uniform Force Method(Equations from Manual)
cb ee tantan
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
62
65
Calculating Capacity10 Numbers to Memorize (2010 ASD)
• 0.928• 27• 45• 1.25• 1.3• 3.4• 0.5• 0.6• 1.2• 1.5
Reviewing Software Generated Connection Designs
• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
66
SummaryReviewing Software Generated Connection
Designs• Look at Every Connection• Know the Required Strengths• Determine the Load Path• Estimate the Capacity
– See “Evaluating a Connection” Handout– Quick Hand Calculations (Numbers to Memorize)– Printed Calculations
• Evaluate Constructability!
78