Calculate the weight of the soil, Civil Engineering

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Calculate the weight of the soil.

Go to the first screen.

1. Establish the geometry of the member that you want to design.

2. Each member has to be designed separately.

3. All members are simply supported.

4. Joists A, B, and C have a cantilever.

a. To input a cantilever input the cantilever as the first span and the main portion of the joist as the second span.

b. The length of the joist including the cantilever is shown on the roof plan.

c.  The length of the joist is shown on the foundation plan. The length will be the distance from the outside wall to the inner column.

d.  Eliminate the support by choosing left or right as the cantilever. Left or right depends on how you draw your joist.

5.  Select a beam to design not a roof joist.

6.  Select the type of wood member that you want to use.

7.  Change any of the default deflection criteria to the value in the assignment.

8.  Select full lateral support for the top flange.

Go to the load screen.

1. Input dead, live loads and soil as full area loads. If you have specified the member to be roof Joist, the support width has specified on the first sheet.

2. If the member has been specified as a beam you will have to input a support width.

3. Input the spandrel load as Point (dead) load. Load and location.

4. For joist C input the additional point live load.

Run the beam. You will be asked if you want to save it. Say Yes.

If you get a message "Can't find a section" you should change your member or change the support width. A  glulam beam should work for all members.

Once you have designed your first joist, it is easier if you just modify your input to do the next joist.

Roof beams

For the design of the roof beams, for simplicity assume that the load is a distributed load. You can input the loads as area loads (kPa), same magnitude as the joist loads, and specify the tributary width or you can do the calculation yourself and input the loads as line loads.

Headers.

Treat the loads as distributed loads. Use the formula that I gave you to calculate the tributary width.

Mezzanine floor

Joist D.

1. This member can be designed as a floor joist.

2. Input the span. Leave the deflection criteria as default. Select a joist spacing.

3. Define the loads. There is a dead load, live load and partition allowance. The partition allowance is a dead load as defined in the OBC.

Beams D & E.

  1. Define the span. For the member you can use built up, solid lumber or glulam
  2. Input the floor loads as area loads. Input the tributary width. Add the dead weight of the wall that sits directly on the beam.

Beam F.

  1. Define span. Use a glulam beam.
  2. For the load, the beam supports a partial uniform load. The tributary width will be same as the spacing of the joist.
  3. The beam supports the reactions from beams D & E. You can get the magnitude of the reactions from the design of beams D & E.

Once you have run the beam and selected a size, you should save the member and print the final sheet to a PDF file if you have a PDF printer or to an XPS file.

These are image files and are one or two pages long.

You should submit these files.

Remember to include your name.

You go to

  • Settings,
  • Change
  • Company Information. Put your name as the company name. This will print out on all sheets.

 


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