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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!not-for-mail
- From: mike.mendis@madness.network23.com (Mike Mendis)
- Newsgroups: comp.dcom.sys.cisco
- Subject: On newsgroups
- Date: 12 Jan 1993 05:33:35 -0600
- Organization: Terminal Madness BBS - Newport, RI - 401-848-9069
- Lines: 82
- Sender: daemon@cs.utexas.edu
- Message-ID: <1706.28.uupcb@madness.network23.com>
- Reply-To: mike.mendis@madness.network23.com (Mike Mendis)
- NNTP-Posting-Host: cs.utexas.edu
-
-
-
- I have a project for school in which I need to construct a
- bridge out of toothpicks. (The requirements are below) What
- information I am looking for, is anything regarding bridges or
- actual examples of similar projects. (Which is allowed) I need
- to have the bridge constructed by January 25, 1993. Any
- information would be very useful. If you are sending me a
- graphics image, the filetypes which I currently can use are:
-
- .MAC (MACINTOSH) .TGA (TRUEVISION TARGA)
- .IMG/.GEM (VENTURA) .CUT (HALO)
- .PCX (ZSOFT IMAGE FILE) .BMP (BITMAP)
- .GIF (COMPUSERVE) .MSP (MS PAINT)
- .TIF (TAG IMAGE FILE) .LBM (AMIGA)
- .WPG (WORD PERFECT) .PIC (PC PAINT/PICTOR
- .RLE (COMPUSERVE) .DRW (DESIGNER)
- .CAD (GRAPHICS WINDOWS CAD).EPS (POSTSCRIPT)
- .WMF (WINDOWS METAFILE) .GRF (MISCROGRAFX GRAPH)
- RIX DELUXE PAINT
-
- If there is not a format listed in which you use can you also end
- over either a program to view it or a converter to a format which
- I have listed. The system in which I will be using is a 386 IBM
- compatible with 4 mb of ram, 200 mb hard disk, under an environment of
- Windows 3.1.
-
-
- The project
- -----------
-
- PURPOSE
- the purpose of this activity is to design and build a bridge
- which can be tested for structural strength and then analyzed for
- the forced involved.
-
- MATERIAL
- 1-2 boxes flat or round toothpicks, white glue, meter stick,
- balance, 5 gal bucket, strong cord, 8" piece of 1/4" dowel, water
- (or sand), bathroom scale.
-
- PROCEDURE
- 1. Research bridge designs from literature or actual
- structures. Take note of bracing points and the reinforcements.
- How is the bridge designed to take into account gravitational,
- and load forces and materials?
- 2. Design a bridge which will make from toothpicks and white
- glue. The total weight of the finished bridge cannot exceed 40
- gm. You may build and design as long as the roadbed is flat (in
- a horizontal plan) and unobstructed to allow a matchbook car to
- travel its length. It must be free standing and allow for a 2 cm
- X 30 cm board to pass under the bridge while it rests on a flat
- surface. Allow for adequate drying of the glue. Draw a sketch
- of the bridge to save for further analysis.
- 3. To test the bridge's strength, place 2 flat-topped tables
- 25 cm apart. Place your bridge between the tables and set the
- dowel across the middle of the roadway. Attach 2 loops of strong
- cord on the handle of the 5 gl bucket and place the loops over
- the 2 ends of the dowel. Pour water of sand into the bucket
- slowly until the bridge produces and audible crack sound. Stop
- adding weight and weigh the dowel, bucket, and contents on the
- scale. You may continue adding weight until the bridge breaks
- completely and then take a second reading.
-
- SUMMING UP
- Study the remains of your bridge and mark on your sketch the
- points where the bridge splintered or broke. Draw arrows to note
- the direction of forced acting on the bridge during the testing.
- List ways you could alter the bridge to make it more structurally
- sound. Redraw the sketch of your bridge which includes the
- improvements.
-
- Can you please E-mail the reponses because the computer system I am using
- does not support this newsgroup. I am using a method using the univeristy
- of texas for exporting mail in message groups newsgroups.
-
-
-
-
- ---
- . WinQwk 2.0 #0 . Unregistered Evaluation Copy
-
-