College & Team Information
College or University: Student Chapter:
Address:
Phone: Fax: E-mail:
Website address: Faculty Advisor:
Person In Charge of Project:
       
Team Member Class Team Member Class
Hours spent on project: Cost of Material ($ Amount)
Student: Faculty: Donated: Purchased:
1. Abstract - (Max 500 word narrative)
The beam members of the bridge that was designed and built are comprised of Parallam(r), a wood product that is heavier than conventional wooden members. This material is more economical because it withstands higher loads than wooden members. These members were assembled to form a truss-style bridge that reduces weight by employing thin steel rods, which brace the base of the structure. The use of these rods dramatically increases the bridge's rigidity while minimizing its weight. Steel's low weight and high tensile strength are properties which precipitated the use of these components in concert with the wooden members.
 
2. Deflection Table
Deflection (millimeters - rounded to 2 decimal places)
Loading Inc. Bridge Beam L Beam R Average (L&R) Gross Deck Net Deck
5 kN
10 kN
15 kN
20 kN - 0 min.
20 kN - 15 min.
20 kN - 30 min.
20 kN - 45 min.
20 kN - 60 min.
1) Loading Increments.
2) Bridge - As measured at midspan of the longitudinal beam receiving greatest loading.
3) Beam L - As measured under the longitudinal beam to left of selected deck monitoring point.
4) Beam R - As measured under the longitudinal beam to right of selected deck monitoring point.
5) Average (L&R) - Average of 3 and 4.
6) Gross Deck - As measured under the loading point expected to experience maximum deflection.
7) Net Deck - Column 6 minus column 5.
Deck span (transverse distance between main longitudinal bridge support members measured from inside edge to inside edge) = mm / 100 = mm (max. allowable net deck deflection)
3. Materials List
Material Item Weight (kg)
Total Weight (Kg)
Weight Non-wood (Kg)
Percent Non-wood
4. Summary -Describe Bridge and behavior under load - (Max 500 words)
The bridge deflected unevenly while subjected to a concentrated load uniformly spread out over four-points. The measured difference in deflection between the left and right trusses was 1.46 mm at maximum loading. The rate of deflection of the deck was higher than that of the two trusses. While the bridge was loaded with to 20 kN in 5 kN increments, a nominal deck deflection of 2.92 mm was observed. The maximum allowable deformation of 2.0 mm had been exceeded.
 
5. Project Drawings and Photos
side view end view 3d view project photo team photo
Longitudinal Cross Section Tranverse Cross Section Trimetric View Project Photo Team Photo
Click on drawing or photo above for larger view.
6. Component Details
In ten (10) words or less per each component below, describe the bridge:
Stringers/Girders: A simple truss with a tension member spanning the bottom.  
Deck: Uses number two (2) Southern yellow pine (1X8).  
Floor Beams: Uses 1 3/4 in. wide Parallam (r) wood members.  
Suspension: N/A  
Unique: Four stainless steel rods provide rigidity as tension members.  
 
Describe preservative treatment for all wood members. Include type and concentrations. Also include a short statement of why this treatment was selected. Did the treatment requirement present any special problems? If yes, provide details
   
 
7. Special Considerations
The pressure treated Parallam truss and floor beam members are durable and environmentally friendly. Due to durability concerns, stainless steel rods and coated bolts have been used. For future designs, the stiffness characteristics of the decking material will be considered.
 


COPYRIGHT ©2009 - MSRCD
Programming by:Keith Mazer
All rights reserved.