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6th Edition

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Publisher: Cengage Learning

ISBN: 9781337094740

Chapter 9, Problem 9.5.1P

Textbook Problem

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A fully composite floor system consists of

a. Use LRFD.

b. Use ASD.

c. Select stud anchors and show the layout on a sketch similar to Figure 9.13.

To determine

**(a)**

Use LFRD method to select the

**Given:**

Thickness of slab, t = 4.5 inches, spacing = 6.5 ft, span length, L = 36 feet, yield stress = 50 Ksi

Construction load = 20 psf, and live load = 175 psf.

The value of

**Concept Used:**

**Calculation:**

Using LRFD method, we have

To select the suitable W 16 shape as follows:

Calculate the loads on the beam as follows:

After curing we have,

Where,

between two adjacent beams.

The dead load on the beam after the concrete has cured is:

Where,

Neglecting the beam weight and check for it later.

Calculate the live load on the beam using the following equation:

Where,

Calculate the factored uniformly distributed load after curing has completed by the following formula:

Where,

Substitute the values, we get

Calculate the bending moment on the beam;

Where,

Let’s try a 16-inch deep beam.

Select a shape with the limiting self-weight given by the following formula:

Where, t is the thickness of the concrete slab, d is the depth of the steel beam, a is the distance of the neutral axis from the top,

Estimating weight per unit foot of the steel beam as:

Let’s try for W 16 X 31 and note the properties and dimensions from the Manual.

Calculate the strength of the section as following below:

Where, the compressive force is C, the compressive force of concrete is

Calculate the compressive force in steel as follows:

Where, the area of steel section is

Get the value of

Calculate the compressive force in concrete as following:

Where, b is the width of the concrete slab, t is the thickness of the concrete beam and

The effective flange width is as follows:

Substitute the values in the above equation, we get

Therefore, the compressive force is as follows:

Therefore, the plastic neutral axis lies in the slab.

Calculate the tensile force (T) and compressive force (C) and the position of plastic neutral axis from the top of concrete slab by following formula:

Compute the flexural strength as:

Where,

neutral axis.

Compute the value of Y as following below:

Substitute the values, we get

Calculate the design strength of the section as follows:

Where,

To determine

**(b)**

Use ASD method to select the

To determine

**(c)**

Selecting the stud anchors for the given section.

Steel Design (Activate Learning with these NEW titles from Engineering!)

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Ch. 9 - A W1840 floor beam supports a 4-inch-thick...Ch. 9 - A W2157 floor beam supports a 5-inch-thick...Ch. 9 - A W2455 floor beam supports a 41 2 -inch-thick...Ch. 9 - Compute the nominal flexural strength of the...Ch. 9 - Compute the nominal flexural strength of the...Ch. 9 - Compute the nominal flexural strength of the...Ch. 9 - A W1422 acts compositely with a 4-inch-thick floor...Ch. 9 - A composite floor system consists of W1897 beams...Ch. 9 - A fully composite floor system consists of W1216...Ch. 9 - A fully composite floor system consists of W1650...

Ch. 9 - A fully composite floor system consists of...Ch. 9 - A fully composite floor system consists of...Ch. 9 - How many 3 4 inch3inch stud anchors are required...Ch. 9 - How many 7 8 inch31 2 inch stud anchors are...Ch. 9 - Design stud anchors for the beam in Problem 9.3-1....Ch. 9 - A fully composite floor system consists of...Ch. 9 - A floor system has the following characteristics: ...Ch. 9 - A floor system has the following characteristics: ...Ch. 9 - Note For Problems 9.6-1 through 9.6-5, use the...Ch. 9 - Note For Problems 9.6-1 through 9.6-5, use the...Ch. 9 - Note For Problems 9.6-1 through 9.6-5, use the...Ch. 9 - Note For Problems 9.6-1 through 9.6-5, use the...Ch. 9 - Note For Problems 9.6-1 through 9.6-5, use the...Ch. 9 - A fully composite floor system consists of W1835...Ch. 9 - A composite floor system uses formed steel deck of...Ch. 9 - Determine the nominal strength of the following...Ch. 9 - A composite floor system consists of W1840 steel...Ch. 9 - Use the composite beam tables to solve Problem...Ch. 9 - A simply supported, uniformly loaded composite...Ch. 9 - A beam must be designed to the following...Ch. 9 - Same as Problem 9.8-3, but use ASD.Ch. 9 - The beams in a composite floor system support a...Ch. 9 - Same as Problem 9.8-5, but use ASD.Ch. 9 - Use the composite beam tables to solve Problem...Ch. 9 - A composite floor system consists of steel beams...Ch. 9 - Use the composite beam tables and select a W-shape...Ch. 9 - Use the composite beam tables and select a W-shape...Ch. 9 - An HSS973 8 filled with concrete is used as a...Ch. 9 - The composite compression member shown in Figure...

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