Structural Steel Design by Jay Ryan Santos

8/11/2019 Structural Steel Design by Jay Ryan Santos

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Structural Steel DesignBy: Engr. Jay Ryan R. Santos

Civil-Structural Engineer


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I. Introduction to Steel DesignII. Tension MembersIII. Columns (Compression Design)IV. Beams (Flexure Design)V. Combined Bending and Axial loadVI. TorsionVII. Frames- Braced, Unbraced and RigidVIII. Bolts

IX. WeldingX. ConnectionsXI. Composite Steel-Concrete ConstructionXII. Steel Design for High Seismic

Course Syllabus


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References: AISC 14thEdition

AISC 360-10

NSCP 6thEdition (2010)

Steel Structures (Design andBehaviour) 5thEdition by

Salmon and Johnson

Course Syllabus


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Why Steel?

Advantages:

1) Lightweight per structure compare to RC

2) Easy to Fabricate and Install

3) High Salvage Value

Introduction to Structural SteelDesign


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Why Steel?

Disadvantages:

1) Fire susceptible

2) High Maintenance (Painting, Rust Proofing, etc..)

3) Vibration Susceptible (thin members supportingheavy and cyclical loadings)



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Fig. 1: Steel Pipe Rack


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Introduction to Structural Steel

Design

Fig. 2: Modular Steel Structures


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Design

Fig. 3: Available Steel Grades and Properties (Salmon and Johnson,Steel Structures 4thEd)


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Types of Structural Steel:

Rolled Shapes


Design


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Types of Structural Steel:

Cold-Formed


Design


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Unstiffened and Stiffened Elements


Design

UnstiffenedElements

StiffenedElement


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Compact and Non- Compact Sections


Design


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DesignSlender and Nonslender Elements


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Allowable Strength Design (ASD) as per AISC 360-10

and NSCP 2010.

Ra Rn/



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Load and Resistance Factor Design (LRFD) as per AISC

360-10 and NSCP 2010.

Ru Rn



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Loads, Load Factors and Load Combinations:

D = dead loadL = live load

Lr= roof live load

S = snow load

R = nominal load due to initial rainwater or ice exclusiveof the pounding contribution.

W = wind load

E= earthquake load



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LRFD Load Combination: AISC 360-10

1. 1.4D

2. 1.2D+1.6L+0.5(Lr OR S or R)

3. 1.2D+1.6(Lr or S or R) + (0.5L or 0.5W)

4. 1.2D+1.0W+0.5L+0.5(Lr or S or R)

5. 1.2D+1.0E+0.5L+0.2S

6. 0.9D+1.0W

7. 0.9D+1.0E



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ASD Load Combination: AISC 360-10

1. D

2. D+L

3. D+(Lr or S or R)

4. D+0.75L+0.75(Lr or S or R)

5. D+(0.6W or 0.7E)

6. 0.6D+0.6W

7. 0.6D+0.7E

Structural Steel Design by Jay Ryan Santos

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