The 2009 RCSC MARKETING PUBLICATIONS REDESIGN TITLE CHANGE. Specification for Structural Joints Using High-Strength Bolts. Why use RCSC Specification?

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1 14 th Edition Steel Construction Manual Introduction to the new AISC Publications Specification for Structural Joints using High-Strength Bolts (AISC ) Code of Standard Practice (AISC ) Specification for Structural Steel Buildings (AISC ) Ohio Structural Engineers Association (SEAoO) Cincinnati, OH February 9, 2011 Jie Zuo AISC Staff Engineer Part 16.1 (AISC ) Specification for Structural Steel Buildings Part 16.2 (AISC ) Specification for Structural Joints using High-Strength Bolts Part 16.3 (AISC ) Code of Standard Practice Louis F. Geschwindner Seminar 2010 Specification and 14 th Edition Manual Full day seminar = 0.80 CEU / 8 PDH Purchase the Manual for $100 (a $350 value!) Design Examples illustrate provisions of the Manual and the Specification Cleveland, OH on February 23, 2012 Columbus, OH on April 5, 2012 For more information The 2009 RCSC Specification for Structural Joints Using High-Strength Bolts AISC TITLE CHANGE 2004: Specification for Structural Joints Using ASTM A325 or A490 Bolts 2009: Specification for Structural Joints Using High-Strength Bolts Why use RCSC Specification? Design, installation, and inspection of bolted joints There are sections in RCSC Specification that are not reproduced in the AISC Specification 1

2 TC bolts HIGHLIGHTS Coatings for A490 bolts Hot-Dip Galvanizing Thermal cutting of holes Snug tight definition New ASTM Provisions TC Bolts ASTM F1852 A325 strength level TC bolt ASTM F2280 A490 strength level TC bolt Treated the same as A325 and A490 bolts except they are Tension Controlled (TC) bolts Coatings for A490 Bolts ASTM F1136 Does not have hydrogen trapping conditions Zinc/Aluminum coating Dacromet is a common product used Hot-Dip Galvanizing for threaded parts ASTM F2329 replaces A153 A153 is still applicable for structural shapes Mechanical Galvanizing is still based upon ASTM B695 Thermal cutting of holes Bolt Shear Strength Consistent with what was done in the 2010 AISC Spec, bolt shear strength values have been increased. RCSC still uses strength and serviceability separation for slip resistance. Laser, plasma, flame, etc. Must meet surface roughness limits 2

3 FOR END-LOADED CONNECTIONS ANSI/ AISC TABLE J3.2 Nominal Stress of Fasteners and Threaded Parts [b] End loaded connections with fastener pattern > 38 in., F nv = 83.3% of tabulated value Pre-Installation Verification and Installation Requirements have been clarified Short-bolt usage of a DTI now permitted Difference between pre-installation values and installation values clarified 3

4 Snug-Tight Definition (OLD) Plies in firm contact Full effort of an ironworker with an ordinary spud wrench Snug-Tight Definition (NEW) the condition that exists when all of the plies in a connection have been pulled into firm contact by the bolts in the joint and all of the bolts in the joint have been tightened sufficiently to prevent the removal of the nuts without the use of a wrench. Not many changes SUMMARY New material specifications Revised bolt shear strength values Clarification of provisions The 2010 AISC Code of Standard Practice AISC HIGHLIGHTS Scope Tolerances Structural Steel Drawing Information Pre-Detailing Conference Erection Drawings EOR Structural Narrative AESS Welds Option 3 Small Changes Big Change Appendix A: BIM Scope (Section 1.1) Buildings and Bridges (same as always) Other Structures added Consistent with AISC (Specification for Structural Steel Buildings) 4

5 Tolerances (Section 1.9) Tolerances remain in Sections 6 and 7 Section 1.9 Added as invoking language Addresses tolerances not explicitly covered in the Code Tolerances not covered are not to be assumed as zero Structural Steel (Section 2.1) What is considered Structural Steel? Base plates vs. Bearing plates If attached to structural frame = Structural If loose items do not attach to structural frame = NOT Structural (loose lintels, etc.) Drawing Information (Section 3.1) Improved list of items that should be provided in the contract documents Works with information added on column differential shortening and anticipated deflections in the Commentary to Section 7.13 Pre-Detailing Conference (Section 4.1) Goal: To open lines of communication and develop a common understanding about the project Erection Drawings (Section 4.7) New section Similar requirements as for shop drawings Oriented toward ensuring the Erector has information when it is needed EOR Structure Narrative (Section ) Example narratives added to Commentary Describes special erection conditions or other considerations that are required by the design concept Highlights special considerations in the erection of cantilevered members 5

6 AESS Welds (Section ) Visual inspection of welds performed from the installed vantage point If you can t see it from where its installed, it doesn t matter Option 3 Delegated Connection Design Work Option 1 The complete connection design shall be shown in the structural design drawings The SER designs the connections Option 1 The intent of this approach is that complete design information necessary for detailing the connection is shown in the structural design drawings The steel detailer will then be able to transfer this information to the shop and erection drawings Option 2 The connection shall be designated to be selected or completed by an experienced steel detailer The SER provides the schematics and the steel detailer completes the details Option 2 It is not the intent that this method be used when the practice of engineering is required 6

7 Option 3 The connection shall be designated to be designed by a licensed professional engineer working for the fabricator The SER provides design criteria and a licensed professional engineer working for the fabricator designs the connections Mix-n-Match One of these options must be specified for each connection type Acceptable to use multiple methods on same project Communication Required Communication Required Communication Required Restrictions on types of connections Connection design loads and associated criteria must be defined Forces, moments, ASD or LRFD loads, and similar information is the key What substantiating connection information is required? (if any) Substantiating Connection Information Information submitted by the fabricator when option (2) or option (3) is designated for connections (if requested by the SER) Early on, the fabricator and SER need to discuss and agree on representative samples of the required substantiating connection information 7

8 Review and Approval The connection design engineer must review and confirm in writing, as part of the substantiating connection information, that the shop and erection drawings properly incorporate the connection designs Teamwork The SER is inviting the fabricator and the licensed professional engineer in responsible charge of the connection design to be a part of the SER s design team. This review does not replace the approval process of the shop and erection drawings by the SER, it is an addition to it Final Authority The SER is identified as the final authority in the case of a dispute between the SER and the licensed professional engineer in responsible charge of the connection design when option (3) is specified This is simple and straightforward, and it is how it must be because only the SER has the full knowledge of the structure SUMMARY Simple and straightforward approach to a practice that already exists, is in wide use, and currently is widely varying in how it is used Language allows all parties to control their own risks, and no party is asked to assume the responsibility for the negligence of another party The 2010 Specification for Structural Steel Buildings ANSI/ AISC The 2010 AISC Specification AISC AISC AISC AISC

9 ANSI/ AISC HIGHLIGHTS K2. HSS-TO-HSS TRUSS CONNECTIONS 2005 Chapter N. Quality Control and Quality Assurance - Minimum requirements for QC, QA, and NDT Chapter J. Design of Connections - Bolt shear strength values increased - Chapter K. Design of HSS and Box Members Connections - Reorganized in a tabular format with figures K2. HSS-TO-HSS TRUSS CONNECTIONS TABLE K1.1 Available Strengths of Plate-to-Round HSS Connections ANSI/ AISC SUMMARY Minimal changes Most changes are simplifications Some changes add new capabilities Some changes increase economy ANSI/ AISC The 2010 AISC Specification, 2010 Code of Standard Practice, and 2009 RCSC Specification are free for download at 9

10 The 14 th Ed. Steel Construction Manual is now available in the AISC online bookstore! A second option for the location of the branding A second title. option for the location of the branding title. AISC Regional Engineers For more information or to contact your regional engineer, log on to AISC Upper Midwest Regional Engineer Monica Shripka, PE, LEED AP Senior Regional Engineer Southeast Region shripka@aisc.org 4444 N. Damen, 4W Chicago, IL Thank You American Institute of Steel Construction One East Wacker Drive, Suite 700 Chicago, IL zuo@aisc.org A second option for the location of the branding A second title. option for the location of the branding title. There s always a solution in steel