CE591 Introduction PowerPoint (PDF)

CE591 ADVANCED STRUCTURAL STEEL DESIGN MWF 2:30 PM HAMP 2123 Judy Liu

Introduction • Syllabus, etc. • Topics

• Review – Load and Resistance Factor

Design (LRFD) • AISC 2010 Specification • Unified Specification, LRFD and Allowable

Stress Design (ASD)

Syllabus

Office Hours Mon, Wed, Fri 3:30 – 4:20 PM (or by appt)

Lectures / Reading Homework posted on site

https://engineering.purdue.edu/~jliu/course591.html

Syllabus

Required AISC Steel Construction Manual, 14th edition (more information later)

For reference only Steel Structures, Design and Behavior, 5th ed. On Reserve in Engineering Library; or see Molly in HAMP4141 to sign out

Unified Design of Steel Structures, 2nd ed. See Molly in HAMP4141 to sign out

Syllabus, cont’d Homework: … turned in at the beginning of the lecture on the date due. Late assignments will not be accepted …. The lowest homework grade will be dropped.

Exams and Grading: There will be two mid-term exams and a non-comprehensive final. All exams are open book (i.e., AISC Manual only). There will be no make-up exams unless arrangements have been made …

Ethics: Academic dishonesty will not be tolerated. http://www.purdue.edu/odos/osrr/academicintegritybrochure.php

Syllabus, cont’d Emergencies: Please review material related campus emergencies; please also familiarize yourself with exits, emergency assembly area for this building, etc.

# for Lectures/ Reading

Note: Evening exams scheduled for midterms

SteelDay October 4

Guest Lecture October 11

http://www.aisc.org/steelday http://www.purdue.edu/vpsa/CSEL/

Lectures / Reading • Posted weekly • Suggested

reading • Lecture objectives • Also posted: PDFs of PPT files

Homework

Until you get your manual, remember that the AISC Specifications are available for FREE download from the AISC website (freePubs). Note: with FREE student membership, you can get even more publications for free, as well as other benefits!

http://www.aisc.org/content.aspx?id=2884

CE591 Topics • Flexural Members with Slender Webs

(Plate Girders) • Composite Beams, Columns and BeamColumns • Lateral Bracing • Connections • Gusset Plates • Beam-to-column & beam-to-girder connections

Plate Girders

http://www.capitol-steel.com/BigGirder3.jpg

http://www.stssteel.com/img/thruway_bridge.jpg

Plate Girders

Marriott Marquis Hotel, Washington, D.C. Modern Steel Construction, July 2013

Steel Plate Shear Walls, Composite Columns

U.S. Federal Courthouse Seattle, WA Images courtesy of John Hooper, MKA

Composite Columns, Beam-Columns

Pacific Century Place Marunouchi, Tokyo

http://markb-photo.que.jp/pages/0005.html

Taipei 101

http://skyscraperpage.com/cities/?buildingID=18

www.structuremag.org

Composite Beams

Forney Hall of Chemical Engineering, Purdue

Connections – Gusset Plates

A. Astaneh-Asl, 1998

Connections – Gusset Plates

Wang Hall, Purdue

Connections – Gusset Plates

Lamar Corp. Headquarters Images courtesy of Elisabeth Wong, SDI Structures

Beam-to-Column & Beam-to-Girder Connections Wang Hall, Purdue

Beam-to-Column & Beam-to-Girder Connections

CSEL, Purdue

Beam-to-Column Connections

Forney Hall, Purdue

Design • Allowable Strength Design (ASD)

My fy fb   Fb  I F .S . • Load and Resistance Factor Design (LRFD)

Rn    Qni i

LRFD Frequency

f(R) f(Q)

Frequency

Qm

Rm

bs ln (R/Q)

[ln (R/Q)]m

Fails if Q≥R R-Q≤0 P(R/Q) ≤1 P(ln(R/Q) ≤ 0 ln (R/Q)

Limit States • Strength • Yield

BEHAVIOR Safety and load-carrying capability

• Fracture • Buckling

• Serviceability • Deflection, vibration

OCCUPANCY function

AISC [2-10], based on ASCE 7

Load Combinations • STRENGTH • 1.4 D • 1.2 D + 1.6 L + 0.5 (Lr or S or R) • 0.9 D +/- (1.0 W or 1.0 E)

…etc.

• SERVICEABILITY • D+L, or L only

• W (with some load combinations per ASCE)

Resistance Factors,  • Depend on limit state • Tension Member

• Yield

 = 0.9

• Fracture

 = 0.75

• Compression  = 0.9 • Flexural Yield  = 0.9 • Shear Yield

 = 1.0 (for rolled I-shaped members)

Unified Specification

- Modern Steel Construction, March 2005





The “dichotomy between LRFD and ASD had to be eliminated” Improved Commentary and added User Notes

AISC 2010 Specification • Some of the changes • Structural Integrity of Connections – added • Design for Stability – major revisions • Compression, Flexure, Shear – minor changes

(some for consistency with other standards) • Composite Members – reorganization, new topics, expansion based on test results • Connections – some changes based on test results http://www.aisc.org/UploadedContent/2010NASCCSessions/E3/

W40 x 149?

www.jfisteel.com

http://www.tradeindia.com/fp1100423/Heavy-Composite-Steel-Plate-Girder.html