Header Assembly for Revit Structure…..next step prepare an extension that does complete design!

Below you will see the header assembly I created for revit structure. You can do following things with it…

1. Customize  opening width

2. Customize opening height

3. customize number of jack studs

4. customize number of king studs

5. customize header depth

6. customize header width (will change automatically with wall thickness)

7. Jacks and King studs depth will change automatically with wall thickness

8. You can insert at any level and customize its offset from level

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Design of Fire Rated Wood Beams Exposed three sides based on “Lie Method”

There are several methods have been developed since early 70’s when T. T. Lie developed a simplistic method to design heavy timber beams exposed on three sides for fire resistance at NRCC [1].

I have performed several design examples for calculating endurance time for beams exposed to three sides for various sizes based on the equations provided in technical literature provided by AF&PA [2] and below are my calculated results*. The sizes which has endurance time of 1 hour or more are highlighted in green.

 

Fire_Resistance_Exposed_Wood_Beams

Design Results for Fire Resistance of Wood Beams Exposed on Three Sides

References:

1. “Calculating Fire Resistance of Exposed Wood Members” By AF&PA – Technical Report 10.

2. “Design for Code Acceptance” by AF&PA.

*”These results shall not be used directly for any design without performing a design and analysis by a structural engineer and confirmed by a professional engineer. This blog is for educational purposes only and are based upon calculations done based on formulas provided in technical literature by AFPA [2]”

100% 75% <=50%
b d t
1.5 9.25 14.62 16.45 19.01
3 9.25 28.01 31.51 36.41
4.5 9.25 40.16 45.18 52.21
1.5 11.25 14.73 16.57 19.15
3 11.25 28.45 32.00 36.98
4.5 11.25 41.15 46.29 53.49
1.75 9.5 16.96 19.08 22.05
3.5 9.5 32.28 36.32 41.97
5.25 9.5 45.97 51.72 59.76
7 9.5 58.02 65.27 75.42
1.75 11.875 17.12 19.27 22.26
3.5 11.875 32.94 37.06 42.82
5.25 11.875 47.44 53.38 61.68
7 11.875 60.64 68.22 78.83
1.75 14 17.22 19.38 22.39
3.5 14 33.34 37.50 43.34
5.25 14 48.34 54.38 62.84
7 14 62.23 70.01 80.90
1.75 16 17.29 19.46 22.48
3.5 16 33.62 37.82 43.70
5.25 16 48.96 55.09 63.65
7 16 63.34 71.26 82.34
1.75 18 17.35 19.52 22.55
3.5 18 33.83 38.06 43.98
5.25 18 49.45 55.63 64.29
7 18 64.21 72.23 83.47

Material Properties in Revit Structure!!!

Many times when we download Revit Libraries from online resources we do not find the right material that we need. In order to have the right material properties selected you can follow below procedures.

1. Open the .rfa (Family) file

2. Go to Manage >> Material tab from menu bar

3. Click on Material will open below window >> Add New Material (See very bottom left)

4. By clicking this icon it will ask you to duplicate material >> Click OK >>

5. Now…Look at right side of new window >>you will need to set up Material properties such as Graphic >> As shown below…

6. In Graphics Tab >> chose the material color (RGB code) or chose color from pallet. You can also select surface pattern.

7. Now we will select rendering of material…in this example its for wood material (Make sure to keep the same for entire library)…Please note that the RGB code for rendering may be different than your regular graphics RGB Code.

8. Now we will create identity of material….which is in our case>>>wood so it will not have manufacturer specific identity which may be the case in order to create manufacturer specific material properties.

8. Now we will add Physical properties, now this is very important in case of Revit Structure because if we want to incorporate in to any structural analysis software these properties may be transferred to the analysis program and hence modeling need to be done only once.

9. Hit Apply>>>OK. You are all set with your new material. Select elements of the revit family and apply this material.