# Homework Help: Perpendicular Beam Deflection question

1. May 17, 2012

### Bman426

1. The problem statement, all variables and given/known data
Given a W21x68 beam with 1.388 kips per foot loading spanning 34 feet. The beam will carry the load but the maximum deflection is greater than wanted. We would like to put a W33x118 beam perpendicular to the centerline of the W21x68 (17 feet), to limit the deflection.

2. Relevant equations
Calculating the the final deflection of the beams?

3. The attempt at a solution
?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. May 17, 2012

### PhanthomJay

Is this a homework question or a work related question? What is the span length of the W33? Is the W21 resting at the mid span of the W33? The location affects the relative stiffnesses of the beams.

3. May 21, 2012

### Bman426

Sorry I didn't get back to post until now, I have been out of the area for a bit.

It is a work problem. The problem is one for a concrete bridge. This question comes from the formwork that is to be used to pour the new bridge. The contractor I am working with wants to limit the total deflection to 1/4 inch if possible. The W33 will span 40 feet and will have 8 of the W21x68 resting on it at 4' - 8" spacing.

4. May 21, 2012

### pongo38

This question is more appropriate for a forum such as http://www.eng-tips.com where similar problems are often discussed (I suggest)