CALTRANS - Standard and Criteria for Reinforcement Coupler
CALTRANS –
Standard and Criteria for Reinforcement Coupler
CALIFORNIA
DEPARTMENT OF TRANSPORTATION AUTHORIZATION ACCEPTANCE CRITERIA FOR MECHANICAL COUPLERS
ON ASTM A706 and ASTM A615 REINFORCING STEEL
CALTRANS |
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Type of Test Required |
Why ! (Purpose of the test) |
What is the Criteria ? |
Static
tensile strength test |
Tensile strength of the Rebar joint (Rebar to Coupler Splice) joint |
>1.25Fy |
Slip Test |
Used to make sure that the plastic movement
(slip) between the reinforcement bars with in the Mechanical Splice, when
Loaded in tension |
<=0.010 inch after applying 0.5fy
loading |
Uniform Cyclic Load Test (Seismic Elastic) |
Used to make sure how a mechanical splice
performs when subjected to alternating tension and compression
loads for a given number of cycles. Each cycle may exceed the specified yield strain
of the reinforcement bar and is intended to stimulate an earthquake loading. |
100 Cycles of stress variation from 50% to 90% of fy |
Fatigue Loading |
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Low Cycle Fatigue Test |
The purpose of this test is to evaluate the
performance of the splice reinforcement following significant inelastic
stress reversal fatigue cycle which would stimulate a seismic event, This includes a series of elastic stress
reversal cycle followed by increasing inelastic stress reversal cycle
out to 5 times the yield point strain of the reinforcement being
tested. In other words the purpose of fatigue testing of
mechanical splices for steel reinforcement bars is to determine the fatigue strength
of the mechanical splice. The fatigue performance of a mechanically spliced
bar will normally be lower than that of the un-spliced bar. |
10,000 Cycles of alternating tension and
compression load of 170 MPa. |
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