Instruction Manual 012-12111A ® *012-12111* PASCO Structures System Cast Beam Structures Set ME-7009
The cover page shows the ME-7009 Cast Beam Structures Set models of a Tension Fixture (left) and a Test Fixture (right). The tension fixture uses a hanging mass to pre-stress a cast beam member, and the test fixture can be used after the cast beam member has dried and the mold has been removed. A hanging mass applies a load to the cast beam, and a displacement sensor measures the amount of deflection. The Tension Fixture and Test Fixture can be constructed concurrently with the items in this set.
Table of Contents Included Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Required Materials, Related and Recommended Equipment . . . . . . . . . . . . . . . . . . . . . 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Making a Pre-tensioned Cast Beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cast Beam Structures Set iv ®
Instruction Manual 012-12111A ® *012-12111* PASCO Structures System Cast Beam Structures Set ME-7009 1 2 12 3 15 11 4 1 14 13 10 5 9 6 17 8 16 18 7 20 19 22 23 21 Included Items Qty Included Items Qty 1. Axle (2 each of 3 lengths) 6 13. Spacer 12 2. #5 Beam (24 cm long) 8 14. Collet 24 3. #4 Beam (17 cm long) 18 15. Pulley 12 4. #3 Beam (11.5 cm long) 18 16. Angle Connector 24 5. #2 Beam (8 cm long) 8 17. Straight Connector 24 6. #1 Beam (5.5 cm long) 8 18.
C a s t B e a m S tr u c t u r e s S e t ME-7009 The ME-7009 Cast Beam Structures Set consists of items from the following parts of the PASCO Structures System.
Cast Beam Structures Set ME-7009 Reinforced Concrete Reinforced concrete has reinforcement bars (“rebar”), grids, plates or fibers incorporated to increase the tensile strength of the concrete. Since steel is a material that has high strength in tension, it is commonly placed in concrete to add strength and to help the concrete resist tension. Reinforced concrete is sometimes described as precast concrete.
C a s t B e a m S tr u c t u r e s S e t ME-7009 Example Tension Fixture #3 Slotted Masses #5 Sliding Connector #3 Cord Tensioning Clip Rebar Member Mold Sliding Connector #2 #1 Angle Connector Half Round #3 Medium Axle #3 Flat Round Cord #5 Sliding Connector #4 Pulley #3 Straight Connector #5 #1 Angle Connector Weights Tension Fixture • Make sure that the two Sliding Connectors on the #5 beams are slightly loose so that they can slide freely along the beams.
Cast Beam Structures Set ME-7009 After Drying, Remove the Mold • Let the mixture dry in the mold for 24 hours. • After the concrete dries, relieve the tension on the beam and then remove the cast beam member from the tension fixture. • Carefully remove the mold from the cast beam. (The mold can be cleaned and used again.) Assemble a Test Fixture Cast Beam member with sand/plaster mixture A successful test fixture provides three things: • Support for the cast beam member.
C a s t B e a m S tr u c t u r e s S e t ME-7009 Other Examples of Test Fixtures Two Point Test Fixture The image shows the details of the top of a variation of the previous test fixture. The load on the Cast Beam is applied by two I-beam Members. A dial indicator can be placed on the middle of the Cast Beam to measure its deflection as the load changes.
Cast Beam Structures Set ME-7009 Bridge Test Fixture The image shows a bridge structure with a Cast Beam member. The load is applied by a hanging mass suspended from a cross member, and the tension through the Cast Beam is measured with a 100 N Load Cell (PS-2201). #4 #3 #2 #3 #4 Cast Beam #2 #4 Load Cell Hanging Mass Typical Test Results Stress/Strain Test Fixture The PASCO Stress/Strain Apparatus (AP-8213) can be used to test the strength of the Rebar Member by itself.
C a s t B e a m S tr u c t u r e s S e t ME-7009 Other Tension Fixtures Wheel and Axle Another way to apply a pre-tensioning load to a Cast Beam member as it dries is to use a Drive Wheel and Axle rather than a hanging mass over a pulley. In the image below, the load is measured with a 100 N Load Cell (PS-2201) and the load limit is 100 N. Cast Beam and Mold • Tie the cord to a collet on the axle and use the Drive Wheel and Tire to wind the cord around the axle..
Cast Beam Structures Set ME-7009 Triple Pulley and Axle Use a hanging mass and three pulleys. The three pulleys multiply the applied load on the drying Cast Beam more than a single pulley or a double pulley can. The ‘block-and-tackle’ arrangement of three pulleys has an Ideal Mechanical Advantage (IMA) of 3-to-1. The applied load is measured by a 100 N Load Cell and the load limit is 100 N. Sliding Connector Put the Collet in the ‘jaw’ of the Sliding Connector.
C a s t B e a m S tr u c t u r e s S e t ME-7009 Technical Support For assistance with any PASCO product, contact PASCO at: Address: PASCO scientific 10101 Foothills Blvd. Roseville, CA 95747-7100 Phone: 916-786-3800 (worldwide) 800-772-8700 (U.S.) Fax: (916) 786-7565 Web: www.pasco.com Email: support@pasco.com For the latest revision of this Instruction Manual, visit: www.pasco.com/go?ME-7009 Limited Warranty For a description of the product warranty, see the PASCO catalog.