Saudi Building Code Committee Presentation on Steel Structures Specifications Chapter 22

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Saudi Building Code CommitteePresentation
onSteel Structures SpecificationsChapter 22

• Overview, Issues, Challenges and Future Plans
• by
• The Working Group on Steel Structures
  Specifications
• in collaboration with
• Zamil Steel Buildings Company

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Members of The Working Group

• The initial tentative membership
• Saeid A. Alghamdi (Coordinator)
• CE-KFUPM
• Abul K. Azad
• CE-KFUPM
• Khalid F. Al-Sharif (Saudi ARAMCO)
• Samir Ashour (CE-King Abdulaziz
  University-Jeddah)
• Engineering Manager (Zamil Steel Company) to be
  added!
• The group holds frequent meetings to review
  progress of work and decides on issues relevant
  to Steel Specifications. The main venue of
  meetings is a the campus of KFUPM-Dhahran, unless
  work circumstances require otherwise.

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Scope of Work Charges of the Group

• Scope of Work Mainly to review the
  Specifications on Steel Structures
  Analysis/Design/Construction of the proposed
  draft of Saudi Building Code (SBC) with the
  intent of issuing of a useable first draft of the
  SBC that would
• Cover the wide-spectrum of the needs for Steel
  Structures e.g. Residential and Industrial
  Buildings.
• Be user-friendly with a minimum amount of
  cross-referencing to other documents.
• Charges of the Group
• initial review of Chapter 22 of the proposed SBC
  in view of the present practice and other similar
  design codes
• identification of major issues that require
  further investigations for possible
  amendments, modification, deletion, etc.
• agree on a user-friendly format for Steel
  Specifications and issue the first
  modified draft of Chapter 22
• develop an Arabic version of the Steel
  Specifications.

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Reviewed Documents

• The Steel Specifications in the proposed SBC
  refers to other several documents as
• AISC-LRFD (volumes I and II) and AISC-ASD
  specifications.
• Seismic Provisions for Structural Steel
  Buildings.
• American Iron and Steel Institute (AISI) LRFD
  Specifications for cold formed steel structural
  members.
• American Society of Testing Material (ASTM)
  mainly for material specifications.
• American Welding Society (AWS) mainly for
  connections design.
• Current Regional Codes
• Jordanian Design Code of Steel Structures
  (reviewed Arabic format user-friendly
  multiplicity of referenced design codes)
• Syrian Design Code for Steel Structures (not
  reviewed yet).

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Overview of Chapter 22(SBC Steel Specifications)

• The proposed Chapter is composed of 11 divisions
  as follows

No. Sections Title/Key Elements Constituents Findings/Remarks
I 2201-2205.11 General Standards for material, connectors, design methods, and construction. Use of ASTM standards and two alternative designs (LRFD and ASD ).
II206-2207 Use of AISC-LRFD Adoption of LRFD. Amendments This division is too short and requires re-organization/editing for clarity.
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
III 2208-2209 Use of AISC-ASD Adoption of ASD and Plastic Design (as equal preference). Amendments (refer to old edition of AISC-ASD). Too short and requires re-organization/editing for clarity using new editions of the design code.
IV 2210-2211 Seismic Provisions for Structural Steel Buildings LRFD/ASD Provisions (part I/II) Amendments (seismic zones load combinations). Section 2210 has numerous changes (amendments/addition/deletion)!
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
IV 2210-2211 (continued) Seismic Provisions for Structural Steel Buildings LRFD/ASD Provisions (part I/II) Amendments (seismic zones load combinations) Adoption (complete listing of the AISCLRFD and ASD Provisions!). Section 2210 has numerous changes (amendments/addition/deletion)! Validity of changes should for adequacy (load combinations h/t ratio) specifications of EBF).
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
V 2212-2214 Seismic Provisions (AISC-ASD) General remarks about load combinations (1621.3) ASD-provisions for buildings in Categories B, C, D and E. No preference to LRFD-provisions! Numerous typographical errors (e.g. Eqs. 13-1, 13-6, 13-7) and some terms not defined (e.g. Cc in Eq. 13.5 ).
VI 2215-2216 Cold-Formed Steel Members LRFD-provisions Adoption of AISI-LRFD Amendments Require careful expert-review of the code to compare with the present practice.
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
VII 2217-2218 Design Specifications Cold-Formed Structural Steel Members Adoption of AISI-LRFD with amendments Specifications will be studied after a review of original code sections in addition to expert review form the industry (Zamil Steel Experience).
VIII 2219-2220 Lateral Resistance for Steel Stud Wall Systems General definitions lateral (shear) force design requirements requirements for cold formed steel studs. Reviews of the code (including seismic provisions) to compare with the present practice.
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
IX 2221 Open Web Steel Joists Adoption of the Standard Specifications of Steel Joists (K-series LH-series DLH-series Joists Girders) Publisher Steel Iron Institute (South Carolina 29577, USA). This section is very short and should be amended after a review of the adopted code.
X 2222-2229.3 Design Standards for Steel Storage Racks General (definitions) Exceptions loads (maximum effects of movable loads) Design specifications. Required Reviews exceptions allowable stresses stability Wind and EQ-loads Special designs.
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Overview of Chapter 22 (contd)
No. Sections Title/Key Elements Constituents Findings/Remarks
XI 2230 Design Standards for Steel Cables Application in Buildings. Adoption of the ASCE Standards 17-95 (Structural Applications for Buildings). PublisherASCE Reston, Virginia 20191. This section is very short and should be amended after a review of the adopted code.
XII 2230-22XX Design Standards for Steel Connections General (categories) LRFD-provisions Analysis and design Not included in the proposed code! Should be added.
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SELECTION OF MAIN ISSUES TO BE RESOLVED
Issue Initial view of the group
The Parallel Use of LRFD and ASD The SBC should only emphasize (recommend) using the LRFD specifications (REASONS are numerous! e.g. the scientific basis of ASD methods is obscure and less accurate compared to the LRFD methods)
The Expanded Coverage of Seismic Provisions (ASD and LRFD) The coverage in the proposed SBC is blown out-of-proportion compared to the other 10 divisions! It should be curtailed as the seismic hazard should be limited to exposures of A to C ((seismic zones 2A and 2B).
The Use of ASTM Material Specifications Refer to some obsolete products (e.g.A27). The SASO material specifications should be referred to as well (e.g. material tables with properties and availability)
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SELECTION OF MAIN ISSUES TO BE RESOLVED (contd)
Issue Initial view of the group
The Exclusion of Certain Classes of Residential Buildings (one-and two-family dwellings, and single family housing) in IBC-2003). For instituting this limitation, the proposed code would NOT be user-friendly and it might worth-a-while to develop a UNIFIED code (e.g. SRBC) that would emulate the IRC-2003. Key issues i) residential versus industrial buildings ii) practicality of developing in parallel two design documents iii) modified definitions of residential buildings in the Kingdom compared to definitions elsewhere.
The Absence of Design Specifications for PEB and Open Web Steel Joists An additional division on Connections (bolted and welded) should be added. Specifications on open-web steel joists should be amplified.
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A Review of the IRC-2003
?Advantages Disadvantage
Unified format and self contained document exclusively for one-and two-family dwellings, and single family housing. Highly detailed (see sample design details). Almost all design details are in a ready to use tabulated format. Little is left for the Engineer/Designer to do other than a selection process. Exclusively limited to using cold-formed steel sections. It does not refer to the hot-rolled steel sections and the LRFD specifications for such sections. Emulation of the IRC-2003 will involve a lot of work to make it self contained (e.g. for R/C and Steel Structures designs).
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IRC-2003 Typical Roof Details
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IRC-2003 Typical Floor Framing Details
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IRC-2003 Typical Tabulated Design Selection
Tables
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Overview of Chapter 22STEEL-SBCAN INDUSTRIAL
PERSPECTIVE
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Outline of Expanded Scope of Proposed Steel
Buildings Code

• The proposed Saudi Building Code (SBC) for Steel
  Buildings should address more issues as follows
• Special requirements for Pre-Engineered Buildings
  (PEB) buildings to be addressed.
• Different buildings elements shall be covered
• Built-up members
• Hot-rolled members
• Cold formed members
• Cladding
• Decking.
• Low-rise buildings (e.g. Residential Buildings).

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Detailed Design Requirements for Built-Up Members

• Section geometry ratios and limitations (e.g.
  Af/Aw, H/B).
• Welded/Bolted Connection
• Single side vs. double side welding.
• Bolted connections.
• Stiffener Requirements.

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Hot-Rolled Members

• Various section geometry ratios and limitations
• I Sections
• C Sections
• Angles
• Square tubes
• Rectangular tubes
• Circular tubes
• T sections.

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Cold-Formed Members

• Need for more elaboration on design requirements
  of cold-formed members C, Z and other special
  shapes.
• Need for adding flexibility to the proposed SBC
  by reference to other codes may be added such as
• BS 5400.
• Euro-code 3.

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Cladding

• Diaphragm Action
• Shall be addressed in accordance with SDI code.

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Decking

• Composite decking needs to be addressed.
• SDI and Euro-code 3 may be referenced.

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Low-Rise Buildings Requirements

• Tapering.
• Buckling analysis.
• Welding requirements.

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Low-Rise Buildings Requirements(INDUSTRIAL
RESIDENTIAL)

• Roof live load.
• Deflection limitations.
• Crane load combinations.
• MBSM may be used to address the above issues.

Dear Dr. Saeid, Please find hereunder the reply
from Essam Amin of ZSI PRD Dept. Other notes
about PEB buildings to consider In the early
days, PEB buildings were only meant for use as
workshops, warehouses, car shades, and aircraft
hangars. Today, the use of such buildings extends
to shopping malls, showrooms, gymnasiums, office
buildings.etc. In other words, the application
of aesthetic finishes to metal building systems
has resulted in the use of these systems for more
than just simple humble buildings. PEB
buildings offer metal building systems in the
true sense of the word. This is because
components such as wall cladding, roof cladding,
main and secondary framing, and bracing are all
designed to work together. The latest code on PEB
buildings Metal Building Systems Manual (MBSM
2002 Edition)previously known as the Low Rise
Building Systems Manual.
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Chapter 22STEEL-SBCSummary of Working Group
PlanShort-term plans Long-term plans

• Proposed Timeline (based on continuous meetings
  of members of the group)
• Reviews, comparative studies, documentation,
  editing, modifications (additions, deletion,).
• Issues and challenges.
• Emulation of the Jordanian Steel Building Code
  (ASD vs. LRFD).
• First Draft, Review, Approval, Revised document.
• Final Approval and Documentation, Enforcements.

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Thank you. s.a.alghamdi