![]() ![]() Adequate ductility can be achieved by using a minimum splice length, as defined by ACI 318-95 for beams without transverse reinforcement, plus a minimum quantity of transverse reinforcement over the tension development/lap splice length with an area equal to 50% of the area of the bars being developed/spliced. The result of the analyses used to develop the new design criteria indicate that increasing lap splice length, without providing transverse reinforcement, does not provide an adequate level of ductility in high-strength concrete members. Dayton Concrete Accessories Tension Lap Splice Lengths. Concrete in the compression region is crushed on one side from midspan after reaching the peak load. ![]() Inclined cracks developed in the concrete which defined compression struts running between the. For these beams, rebar yielding occurs at the loaded end of the lap splice and causes stress redistribution. Experimental results supported the proposed behavioral models. Based on recent research on the lap splice strength of reinforcing bars in high-strength concrete, modifications to current design criteria are formulated that will allow removal of the limit on the square root of the compressive strength, ensure adequate ductility and bond, and improve the overall safety of the tension development and lap splice criteria in ACI 318-95 for concrete with strengths above 10,000 psi. What is the difference between lap length and development length in steel. Beams with sufficient lap splice length fail in a ductile manner (yield failure). Safety concerns and a lack of test data are responsible for the current upper limit of 100 psi on the square root of the concrete compressive strength for use in calculating tension development and lap splice lengths. Keywords: bond (concrete to reinforcement) building codes deformed reinforcement high-strength concrete reinforcing steels splicing structural engineering. The two upper splices (A and B) are bolted steel sleeves. Title: Proposed Modifications to ACI 318-95 Tension Development and Lap Splice for High-Strength ConcreteĪuthor(s): Atorod Azizinamini, David Darwin, Rolf Eligehausen, Rob Pavel, and S. lap length of reinforcement bars daily civil, definition and Enter the length. tion shall develop in tension or compression, as re-Mechanical splices of reinforcing bars Proprietary couplers for tension and compression splices ready and able when ordinary lap splices aren’t suitable Figure 1. ![]()
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