Practical Steel Connection Software Design Using AISC 2010 Standard

Practical Steel Connection Software Design Using AISC 2010 Standard Including: Practical Advice for Reviewing Software Generated Connection Designs Steve Ashton, P.E., SECB

Limit States that Changed 2

Bolt Limit States 3

Bolt Materials Group A: (Includes A325 and F1852) F u = 120 ksi * Group B: (Includes A490 and F2280) F u = 150 ksi (* up to 1 diameter) 4

Allowable Shear Strength 1989 2005 2010 A325N 21 ksi 24 ksi 27 ksi A325X 30 ksi 30 ksi 34 ksi A490N 28 ksi 30 ksi 34 ksi A490X 40 ksi 37.5 ksi 42 ksi 5

Table J3.2 2005 6

Table J3.2 2010 7

Bolt Limit States 8

Slip Critical Joints 2005 Specification R n = μd u h sc T b N s (J3 4) Prevention of Slip is a Serviceability Limit State LRFD: = 1.00 ASD: = 1.50 Prevention of Slip at Required Strength Level LRFD: = 0.85 ASD: = 1.76 9

Slip Critical Joints R n = μd u h sc T b N s (2005 J3 4) = 0.35 (Class A) = 0.50 (Class B) R n = μd u h f T b N s (2010 J3 4) = 0.30 (Class A) = 0.50 (Class B) 10

Slip Critical Joints R n = μd u h sc T b N s (2005 J3 4) h sc = 1.00 (STD) h sc = 0.85 (OVS or SSL) h sc = 0.70 (LSL) R n = μd u h f T b N s = 1.00 (STD) = 0.85 (OVS or SSL) = 0.70 (LSL) (2010 J3 4) 11

Slip Critical Joints 2010 Specification R n = μd u h f T b N s (J3 4) h f = 1.00 (0 or 1 Filler) h f = 0.85 (2 or more Fillers) 12

Limit States 13

New Section J4.5 14

Other 14 th Ed. Changes Prying Action Single Plate Shear Connections (Shear Tabs) Fillers New Tables 15

Other 14 th Ed. Changes Prying Action Single Plate Shear Connections (Shear Tabs) Fillers New Tables 16

With prying action: Prying Action (ASD) t min pf u 4Tb' (1 ') T = required strength per bolt p = tributary length per bolt line 2b = 1 d / p d = width of hole along length of fitting 17

Prying Action Nomenclature

Prying Action Double Angle Connection 19

Expanded Bolt Spacing 20

Wide Gage 21

Narrow Gage 22

Narrow Gage and Expanded Bolt Spacing 23

Other 14 th Ed. Changes Prying Action Single Plate Connections (Shear Tabs) Fillers New Tables 24

Conventional Configuration 25

Conventional Configuration 26

Single Plate Connection Conventional Configuration 13 th Edition Manual t p or t w d/2 + 1/16 14 th Edition Manual No requirement if n 5 and SSLT 27

Single Plate Connection Conventional Configuration 13 th Edition Manual Eccentricity can be ignored if: n 9 and STD or n 12 and SSLT 14 th Edition Manual Eccentricity always considered per Table 10 9 28

Other 14 th Ed. Changes Prying Action Single Plate Shear Connections (Shear Tabs) Fillers New Tables 29

Fillers 30

Fillers: J5 2005 31

Fillers: J5.2 2010 32

Fillers: J5 2010 Commentary 33

Other 14 th Ed. Changes Prying Action Single Plate Shear Connections (Shear Tabs) Fillers New Tables 34

14 th 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

Tables 10 13 and 10 14 37

Table 10 15 39

Practical Steel Connection Software Design Using AISC 2010 Standard Practical Advice for Reviewing Software Generated Connection Designs

Software Generated Calculations

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

Required Strengths AISC COSP Section 3.1.2 45

Transfer Forces 46

Transfer Forces 47

Transfer Forces 48

Transfer Forces 49

Transfer Forces 50

Load Path Uniform Force Method 52

AISC Nomenclature 53

Column Forces Uniform Force Method (Equations from Manual) V c P r Hc e r c P Beam forces H b P r Vb e r b P Where r e 2 c e 2 b and tan e tan b e c 54

Uniform Force Method (Traditional) 55

Connection Calculations 56

Uniform Force Method (Compact Gusset) 57

Connection Calculations 58

Workpoint Relocation (Special Case 1) 59

Workpoint Relocation (Special Case 1) 60

Workpoint Relocation (Special Case 1) 61

Calculating Capacity 63

Calculating Capacity 64

Calculating Capacity 10 Numbers to Memorize (2010 ASD) 0.928 27 45 1.25 1.3 3.4 0.5 0.6 1.2 1.5 65

Constructability

Connection Costs

Summary 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! 78

Questions Contact Info: Steve Ashton 816 560 2606 sashton@sds2.com 79