#Lap splice lengths code
The comparison of bond strengths calculated by existing equations and those of tested specimens indicated that the results agreed well.īond confinement ductility lap splice reinforced concrete beams strain gauge transverse reinforcement. Results of an experimental study aimed to evaluate tensile performance, lap-splice length of carbon fabric-reinforced cementitious matrix system (C-FRCM), and performance of concretes confined by C-FRCM are presented. The length of lap should be increased 20 for a three-bar bundle and 33 for a four-bar bundle. Splice lengths were increased to 24db for compression and to 36db for tension for Grade 60 column bars in the 1963 ACI code 1. The effect of this concentration was investigated based on test results. Stress flow discontinuity occurred at the loaded end and caused stress concentration. The strain in a rebar was maximum at the loaded end of the lap splice and progressively decreased toward the unloaded end because the rebar at this end could not sustain any load. Several strain gauges were attached to the longitudinal bars in the lap splice region to study the local behavior of deformed bars during loading. The test results showed that the flexural. Tension lap splice length st of welded deformed wire reinforcement in tension with cross wires within the lap splice length shall be the greater of 1.3d and 8 in., where d is calculated in accordance with 25.4.6. While the 2008 MSJC includes an equation to determine development and lap splice lengths, the 2009 IBC modifies. The other half of the beams were designed with a lap splice length slightly exceeding that recommended by ACI 318-19 they failed by rebar yielding and exhibited a ductile behavior. Cyclic lateral loading tests were performed for eight columns with different lengths and methods of lap splices. Half of these beams had shorter lap splices than that recommended by American Concrete Institute Building Code ACI 318-19 they failed by bond loss between steel and concrete at the lap splice region before rebar yielding.
Twelve full-scale reinforced concrete beams with two tension lap splices were constructed and tested under a four-point loading test.
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