AISC th 15 Edition Whats New CHANGES YOU

BIO • Brian Cobb • P. E. in TN, OH, MI, ND • Chief

Topics to be discussed • • General 15 th Edition Comments Bolt Changes A

DISCLAIMER The views presented here are strictly those of Brian D. Cobb, hereby known

th 15 EDITION, GENERAL CHANGES • The 15 th edition (and CISC 11 th

th 15 EDITION, GENERAL CHANGES • Some shape sizes have been updated to match

th 15 EDITION, GENERAL CHANGES • With size changes and additions, make sure to

BOLTS • • • F 1852 F 2280 F 3125 Group A? F 3125

BOLTS • F 1852 – A 325 “TC” bolts • F 2280 –A 490

BOLTS • F 3043, F 3111 – new designations for “Very High Strength” TC

BOLTS Some bolts have been working out again, and gotten a little stronger.

BOLTS • Group A, slip-critical bolts between 1 -1/8” and 11/2”, have a higher

A 1085, A 500 B, A 500 C Why A 1085 steel for HSS

A 1085, A 500 B, A 500 C Problems with A 1085 (Brian’s perspective)

A 1085, A 500 B, A 500 C A 1085 – Detailer Beware –

IBC STRUCTURAL INTEGRITY • How many have seen this? ? ? • First showed

IBC STRUCTURAL INTEGRITY • Sometimes it’s not so easy to decide…

IBC STRUCTURAL INTEGRITY • THERE IS HELP – AISC 15 th Edition allows you

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AISC th 15 Edition – What’s New? CHANGES YOU MAY OR MAY NOT BE AWARE OF, AND HOW THEY AFFECT DETAILING IN SDS/2

BIO • Brian Cobb • P. E. in TN, OH, MI, ND • Chief Operating Officer, SDLLC / Balata – With SDLLC since 1997 • 2 nd Job – baseball coach

Topics to be discussed • • General 15 th Edition Comments Bolt Changes A 1085 IBC Structural Integrity

DISCLAIMER The views presented here are strictly those of Brian D. Cobb, hereby known as Big. Orange. Fan, and do not necessarily reflect the viewpoints or directives of Design Data (wait, I mean SDS/2) or the American Institute of Steel Construction.

th 15 EDITION, GENERAL CHANGES • The 15 th edition (and CISC 11 th edition) changes are included in SDS/2 as of v 2018. • You may not even need this code yet. – Know the governing code. IBC 2015 is still used commonly. This references AISC 360 -10 (14 th ed) – IBC 2018 is not yet adopted in many jurisdictions.

th 15 EDITION, GENERAL CHANGES • Some shape sizes have been updated to match updated ASTM standards. • New larger pipe, HSS and angle sizes have been added. • Various design formulas have been “tweaked” • The standard hole size for 1” bolts is now 1 -1/8” • A 500 C is now the preferred HSS designation (not A 500 B). • Table 14 -2 (anchor bolt hole sizes) has changed again.

th 15 EDITION, GENERAL CHANGES • With size changes and additions, make sure to install a new material file, from the SDS/2 folder, with a new job. Copying the seed file or a previous job file will not import new sizes. • Table 14 -2 – Minor hole size changes (maybe 2 -5/16 is now 2 -3/8). – Some washer size changes on larger bolts. – Verbiage has been added to state that these hole sizes are in line with ACI 117, and that smaller holes and standard washers should only be used if the contractor agrees to tolerances tighter than ACI 117

BOLTS • • • F 1852 F 2280 F 3125 Group A? F 3125 Group B? F 3043, F 3111? ?

BOLTS • F 1852 – A 325 “TC” bolts • F 2280 –A 490 “TC” bolts • F 3125 Group A – new grouping for A 325 (hex) and F 1852 (TC) • F 3125 Group B – new grouping for A 490 (hex) and F 2280 (TC)

BOLTS • F 3043, F 3111 – new designations for “Very High Strength” TC (F 3043) and hex (F 3111) bolts. – 200 ksi bolts – Specific limitations (must remain dry, must remain free from corrosive materials) – Limited availability – Not domestic – In the 15 th edition manual, these bolts are referred to as GROUP C bolts

BOLTS Some bolts have been working out again, and gotten a little stronger.

BOLTS • Group A, slip-critical bolts between 1 -1/8” and 11/2”, have a higher slip resistance capacity than in the 14 th edition. – The minimum pretension value required in table J. 1 has been increased specifically for these bolts.

A 1085, A 500 B, A 500 C Why A 1085 steel for HSS – Higher Fy, Fu – Better tolerances – Built-in CVN testing per material spec – Better seismic performance (R-value)

A 1085, A 500 B, A 500 C Problems with A 1085 (Brian’s perspective) – This is only stocked at service centers in the Western US – This can be mill ordered, but must be mill ordered in a bundle. • A braced frame would need to b a consistent size up the building. – Only produced by Atlas Tube – If domestic is required, the rolls must be shipped from Canada to Chicago and then manufactured in Chicago.

A 1085, A 500 B, A 500 C A 1085 – Detailer Beware – There is value in this new HSS spec, but it has been sold to engineers without being fully explained. Engineers have changed their design software to A 1085, but do not necessarily have enough of the same size HSS to justify a mill order. – Because the higher strength A 1085 has been designed, when not available the substitute must be A 500 C and not A 500 B. – Perhaps this is why many providers now send A 500 C always, and why A 500 C is now the preferred specification in the 15 th edition manual.

IBC STRUCTURAL INTEGRITY • How many have seen this? ? ? • First showed up in IBC 2009 • If your drawings state IBC 2009, technically you should be aware of this. • Not just IBC – this first appeared in the New York Building Code (9/11 response) then made its way to the IBC and many other state building codes

IBC STRUCTURAL INTEGRITY

IBC STRUCTURAL INTEGRITY • Sometimes it’s not so easy to decide…

IBC STRUCTURAL INTEGRITY

IBC STRUCTURAL INTEGRITY • THERE IS HELP – AISC 15 th Edition allows you to use bearing bolts in short slots in this condition with shear tabs. • If a “normal” shear tab will work for shear, it can be assumed that this will also work for the axial load using bearing bolts. – SDS/2 v 2020 provides structural integrity checks when requested. – AISC 5% load – perhaps some relief there?