Structural Steel Design with LRFD
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|Course Number:||ENGRG 6230|
|Course Name:||Structural Steel Design with LRFD (Online)|
|Course Description:||The purpose of this course is to introduce students to the design of steel structures by the load and resistance factor design (LRFD) method. The newest steel specification requires a strength method (like LRFD) to be used. The allowable stress method (ASD) has been renamed the allowable strength method, and is based on many of the principles of LRFD design. A general overview of the new ASD method will be given, but the focus of the class will be on designing structures with LRFD. Students will learn to design tension and compression members, beams and beam-columns, and connections. A low-rise steel office building will be designed throughout the semester as a group design project. P: CIVILENG 3100 - Structural Mechanics (or equivalent) is required. Familiarity with a structural analysis program (e.g., RISA-2D, STAAD, etc.) will be beneficial but not required.|
NOTE: The information below is representative of the course and is subject to change. The specific details of the course will be available in the Desire2Learn course instance for the course in which a student registers.
After taking this class, you should be able to:
*Explain the theory of load and resistance factor design and determine the probability of failure for structural elements.
*Design a steel structure including:
- Tension members
- Compression members
- Flexural members (including shear and biaxial bending)
- Bearing and slip-critical bolted connections
- Welded connections
- Eccentric connections
- Sidesway, P-d and P-Δ effects
- The use of a structural analysis program as a tool
Unit 1: Introduction
In this unit you will review some of the basic properties of steel. You will also be introduced to load and resistance factor design and some of the underlying theory in determining load and resistance factors based on probability of failure.
Unit 2: Tension Members
Common tension members are truss elements and cross-bracing members in a frame. In this unit you will learn how to calculate the design strength of a tension member. We will discuss the limit states of yielding, fracture and bolt bearing failure of the member itself, and shear failure of the bolts.
Unit 3: Compression Members
Compression members can be found in trusses and as columns in frames. There are several limit states to check: flexural (Euler) buckling, yielding, and local buckling of the cross section (e.g., flange or web buckling of a wide-flanged section).
Unit 4: Beams and Beam-Columns
Beams are structural members that support transverse loading with negligible axial force. Therefore, the strength of beams is determined principally based on shear and moment. The most common limit states for beams are plastic hinge failure, lateral torsional buckling, shear, and local buckling. We will also check deflection serviceability of beams. If a member supports both transverse and axial loads it can be called a “beam-column.” Such members must be designed based on the interaction of axial load and moment, as well as shear.
Unit 5: Introduction to Connection Design
It’s been said that connection design is an exercise in checking limit states. As you design connections in this unit you will need to make sure to check every limit state you can think of that would cause a connection to fail.
Two Exams: 30%
Final Exam: 20%
A = 90% - 100%
B = 80 - 89 %
C = 70 - 79 %
D = 60 - 69 %
F = < 60 %
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