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6th Edition

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Publisher: Cengage Learning

ISBN: 9781337094740

Chapter 8, Problem 8.6.4P

Textbook Problem

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Design a three-plate moment connection of the type shown in Problem 8.6-2 for the connection of a

**a**. Use LRFD.

**b**. Use ASD.

To determine

**(a)**

The design of a three-plate moment connection of a

**Given:**

Service dead-load moment = 42 ft-kips

Service live-load moment = 104 ft-kips

Service dead-load beam reaction = 8 kips

Service live-load beam reaction = 21 kips

Group A bearing type bolts

E70 electrodes

A992 steel- Beam and column

A36 steel- Plate material

**Calculation:**

Reaction:

Moment:

Web plate:

Neglect eccentricity.

Try 5/8-in. diameter bolts.

Assume that threads are in the plane of shear.

Shear capacity of one bolt is

Number of bolts required is

Try 4 bolts.

Determine plate thickness required for bearing. Assume that

Load resisted by each bolt =

Let

Try

Determine whether plate or beam web controls bearing. For the plate,

For the beam web,

Therefore, plate controls.

Check bearing strength assumption:

For the hole nearest the edge, minimum

Try

Therefore, use

For other bolts, minimum

Use

Therefore, use

Bearing controls over shear at each bolt location. Total strength is

Use four 5/8-in. diameter Group A bolts.

Determine plate thickness required for shear:

Shear yielding strength is

Let

Try

Check shear rupture strength:

Use hole diameter =

Check block shear:

Shear areas:

Tension area:

with an upper limit of

The nominal block shear strength is therefore 64.92 kips. The design block shear strength is

Use a

Connection of shear plate to column flange:

Use E70 electrodes

Minimum weld size, based on the plate thickness, is 1/8-in. try

Weld strength =

Base metal (plate) shear strength:

Yielding:

Rupture:

Total length required =

Use a continuous 1/8-in. fillet weld, both sides of plate.

Flange plate:

From

Try 7/8-in. diameter bolts.

Assume that threads are in the plane of shear.

Number of bolts required for shear is

Try 8 bolts (4 pair)

Determine plate thickness required for bearing:

Minimum

Use

Minimum

Use

For the hole nearest the edge,

Therefore, use

For other bolts,

To determine

**(b)**

The design of a three-plate moment connection of a

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Ch. 8 - Use an elastic analysis to determine the maximum...Ch. 8 - The bolt group shown in Figure P8.2-2 consists of...Ch. 8 - A plate is used as a bracket and is attached to a...Ch. 8 - The fasteners in the connection of Figure P8.2-4...Ch. 8 - A plate is used as a bracket and is attached to a...Ch. 8 - The load on the bracket plate consists of a...Ch. 8 - What diameter Group A bearing-type bolt is...Ch. 8 - Use Group A slip-critical bolts and select a bolt...Ch. 8 - Group A bolts are used in the connection in Figure...Ch. 8 - A plate is connected to the web of a channel as...

Ch. 8 - Solve Problem 8.2-2 by the ultimate strength...Ch. 8 - The bolt group shown in Figure P8.2-12 consists of...Ch. 8 - For the conditions of Problem 8.2-12, determine...Ch. 8 - Check the adequacy of the bolts. The given loads...Ch. 8 - A beam is connected to a column with 7 8...Ch. 8 - Check the adequacy of the bolts for the given...Ch. 8 - Check the adequacy of the bolts. The given load is...Ch. 8 - Check the adequacy of the bolts in the connection...Ch. 8 - The flange of a portion of a WT620 is used as a...Ch. 8 - A beam is connected to a column with 3 4...Ch. 8 - A bracket cut from a WT-shape is connected to a...Ch. 8 - For the following designs, use A36 steel for the...Ch. 8 - Same as Problem 8.3-9, but use ASD.Ch. 8 - Use an elastic analysis and determine the maximum...Ch. 8 - Use an elastic analysis and determine the maximum...Ch. 8 - Use an elastic analysis and determine the maximum...Ch. 8 - Use an elastic analysis and check the adequacy of...Ch. 8 - Use E70 electrodes and determine the required weld...Ch. 8 - Check the adequacy of the weld. The 20-kip load is...Ch. 8 - Use an elastic analysis and compute the extra load...Ch. 8 - Use an elastic analysis and compute the extra load...Ch. 8 - An L663 8 is attached to a 3 8 -in.-thick gusset...Ch. 8 - Solve Problem 8.4-1 by the ultimate strength...Ch. 8 - Solve Problem 8.4-4 by the ultimate strength...Ch. 8 - Solve Problem 8.4-7 by the ultimate strength...Ch. 8 - A connection is to be made with the weld shown in...Ch. 8 - Same as Problem 8.4-13, but use ASD.Ch. 8 - Use the elastic method and design a welded...Ch. 8 - Same as Problem 8.4-15, but use ASD.Ch. 8 - A single-angle tension member is connected to a...Ch. 8 - Same as Problem 8.4-17, but use ASD.Ch. 8 - a. Use LRFD and design a welded connection for the...Ch. 8 - Same as Problem 8.4-19, but use ASD.Ch. 8 - Determine the maximum load in the weld in kips per...Ch. 8 - Determine the maximum load in the weld in kips per...Ch. 8 - Use the maximum size E70 fillet weld and compute...Ch. 8 - A bracket plate of A36 steel is welded to a W1250...Ch. 8 - A WT741 bracket is connected to a W14159 column...Ch. 8 - A W1850 beam is connected to a W1499 column. To...Ch. 8 - A W1645 beam is connected to a W1045 column as...Ch. 8 - Same as Problem 8.6-2, but use ASD.Ch. 8 - Design a three-plate moment connection of the type...Ch. 8 - A service-load moment of 118 ft-kips, 30 dead load...Ch. 8 - Determine whether column stiffeners are required...Ch. 8 - a. A W1835 beam is to be connected to a W1453...Ch. 8 - Investigate the adequacy of the bolts in the given...Ch. 8 - Investigate the adequacy of the bolts in the given...Ch. 8 - Design a four-bolt unstiffened end-plate...Ch. 8 - Design a four-both unstiffened end-plate...

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