Introduction to Steel Connections

In this section, the speaker introduces different types of steel connections, including bolted, welded, and riveted connections.

Types of Steel Connections

• Steel connections can be bolted, welded, or a combination of both.

• In the past, rivets were used for joining steel elements.

• Rivets were heated and hammered to connect steel elements.

Bolted Steel Connections

This section focuses on bolted steel connections and discusses the two types of high strength bolts used - bearing type and slip critical type.

High Strength Bolts

• Bolted steel connections are commonly used for their weight-bearing capacity and importance in life safety.

• Two types of high strength bolts are used:

• Bearing type: Holds back gravity loads and is tightened to a snug fit.

• Slip critical type: Super tightened to create tension between the connected elements.

Welding and Bolting in Steel Connections

This section explains the process of combining welding and bolting in steel connections. It also discusses the use of slotted holes and washers in certain cases.

Combination of Welding and Bolting

• In many cases, welding is done in the shop while bolting is done in the field for steel connections.

• A third element, such as an angle or plate, is often used between two steel elements.

• One element is typically welded in the shop while the other is bolted in the field.

Slotted Holes and Washers

• The hole diameter for bolting is usually 1/16 inch larger than the bolt itself to allow for tolerance.

• Slotted holes may be used when larger tolerances are required.

• Washers may be required to prevent tearing, even with non-slotted holes.

Types of Welds in Steel Connections

This section discusses different types of welds used in steel connections, including fillet welds and groove welds.

Types of Welds

• Fillet weld: A single or double-sided weld that joins two elements at an angle.

• Double fillet weld: A type of fillet weld done on both sides of the joint.

• V-groove weld: A groove weld with a V-shaped joint.

• Puddle weld: A small circular weld used for connecting thin elements.

Flange and Web in Steel Members

This section explains the terms "flange" and "web" in relation to steel members and discusses shear connections versus moment connections.

Flange and Web

• The flanges are the top and bottom horizontal parts of a steel member, while the web is the vertical part between them.

• In a typical steel member, the blank refers to the web.

Shear Connections vs Moment Connections

• Shear connection handles gravity loads, while moment connection handles bending as well.

• Shear connections are easier to assemble but cannot handle lateral forces like wind or earthquakes.

• Moment connections are more rigid laterally but require more complex assembly.

Moment Resisting Frames

This section introduces moment resisting frames and discusses their significance in shear and moment connections.

Moment Resisting Frames

• Moment resisting frames provide rigidity against bending forces in addition to shear resistance.

• They involve engaging flanges through welding on both sides for increased strength.

Conclusion

The transcript provides an overview of different types of steel connections, including bolted, welded, and riveted connections. It explains the use of high strength bolts, slotted holes, and washers in steel connections. The transcript also discusses various types of welds used in steel connections and explains the terms "flange" and "web" in relation to steel members. Additionally, it covers shear connections versus moment connections and introduces moment resisting frames.

New Section Understanding Different Types of Connections in Structural Engineering

In this section, the speaker explains the different types of connections in structural engineering and how they affect the resistance to forces.

Moment Connection vs. Pin Connection

• A moment connection occurs when a beam is connected to a column with welding or bolting through the flange.

• In a moment connection, the shoulder of the beam can resist bending forces.

• A pin connection occurs when a beam is held straight out without touching a wall or grabbing onto a handle.

• In a pin connection, the shoulder of the beam can relax as it only needs to resist downward forces.

Shear Connection vs. Seated Beam Connection

• A shear connection involves engaging the web of the beam but not necessarily both flanges.

• Shear connections are often used for gravity loads but may not be able to handle significant bending moments.

• A seated beam connection is an exception where both flanges are engaged at the top and bottom.

• The seated beam connection provides additional resistance against bending forces.

Timestamps were not provided for each bullet point in this section.