Concrete Blog

Thursday, January 16, 2003

 
ACI Manuals

Dr Bracci sent me the following email:

Class:

I understand that some of you purchased the ACI 318-02 at the MSC bookstore
for about $150. This is wrong - it should be about $60 or so. Please take
the book and your receipt back to the bookstore asap. Ask to see either
Mark or Jason. They will give you back the difference.

For those of you who do not have the ACI yet, I believe the bookstore is
out. They are in the process of ordering more, but this may take a few
weeks.

Dr. Sandt:
Please tell you class and remind them that the book is only discounted at
the MSC bookstore.

posted by Doc E at 2:38 PM

Friday, December 13, 2002

 
Final Office Hours

I will be in my office until 5:30 PM on Friday and will be in my office from 12-3PM on Sunday. I will be in my office Monday morning.

posted by Doc E at 10:38 AM

 
Exam 2 Solution

The solution set to exam 2 is online.

posted by Doc E at 10:36 AM

Sunday, November 10, 2002

 
Project Pickup

I will be in my office until 4PM.

posted by Doc E at 2:35 PM

Friday, November 08, 2002

 
Project - A2

I have your Project A1 in my office if you need to get a copy of your numbers.


posted by Doc E at 3:55 PM

Wednesday, November 06, 2002

 
Stirrup Design

So what do with three values for V_u, and how do we design once we have the shear diagram that is given?

You will need to design a shear "envelope", which will enclose the shear diagram. You will need to draw your shear diagram. Determine the shear at distance d from the support.

1. Pick the size of the stirrup, A_v for the design.
   
2. Determine the spacing needed for the shear at the location.
   
3. Select your spacing and the number of stirrups.
   
4. At the end of the stirrups determine the shear.
   
5. Go to 1 and repeat.
   

posted by Doc E at 9:10 AM

Monday, November 04, 2002

 
Gross section properties ?

What does this mean? The 35% and 70% is the moment of inertia of the beam for the gross (uncracked) beam. So

I_g = 1/12 bh³ + (n-1)A_s(d-y_bar)² + bh*(h/2 - y_bar)²


y_bar = (sum n_iy_iA_i ) / ( sum n_iA_i )

where, y_i is the location of the individual components, A_i is the cross-sectional area and n = E_i/E_c


The moment of inertia is going to be 0.35 I_g @ the center and 0.7 I_g @ the edge of the columns. The moment of inertia is used to calculate deflections and stresses in the beam.

posted by Doc E at 5:20 PM

 
Shear Examples

Some people asked for shear examples for the distributions and point loads. I have included two examples for shear shear example and shear spreadsheet.

posted by Doc E at 5:10 PM

Friday, November 01, 2002

 
Live Loading and Tributary Areas

There have been a few questions on where to find the live load information, try
lecture 3. You will find the information on tributary area and ASCE 7-95 table on live loads.

posted by Doc E at 2:24 PM

 
I ALWAYS WONDERED .....

I always wondered what my students did during my lecture. Ignorance was bliss!.





posted by Doc E at 2:08 PM