Aci rebar lap splice length code#

Provisions in Chapter 12 of the Code attempt to account for the many variables affecting the tension development length, L d *, of a straight bar. The concept of development length of reinforcing bars was introduced in the 1971 ACI Building Code. The ACI Code cites Structural Welding Code Reinforcing Steel (ANSI/AWS D1.4-98) as the standard for welding reinforcing bars. Further information on mechanical splices is presented in the CRSI publication, Reinforcement Anchorages and Splices, 4th Ed., Commentary Section R3.5.2 of the Code discusses welded splices. Regarding Item (i), provisions in other parts of the Code include performance requirements for mechanical and welded splices. The basic premise is the anchorage length or embedment length must be equal to or greater than the required tension development length of the bar. A reinforcing bar must be embedded or anchored a sufficient distance or length in concrete so the bar will be capable of developing its design strength. Anchorage length can also be called embedment length. Two items, 1.2.1(h) and 1.2.1(i), are concerned with anchorage and splicing of reinforcement: (h) Anchorage length of reinforcement and location and length of lap splices (i) Type and location of mechanical and welded splices of reinforcement This report focuses on Item (h), i.e., on determining tension development lengths and tension lap splice lengths of reinforcing bars. Lap Length for Compression Bars: The lap length for compression lap splice is measured according to ACI 12.16.1 ENGINEERING DATA REPORT NUMBER 51 Tension Development and Lap Splice Lengths of Reinforcing Bars under ACI A SERVICE OF THE CONCRETE REINFORCING STEEL INSTITUTE Introduction Section in the 2002 ACI Building Code lists 13 items that must be shown on design drawings or in project specifications. Here, ld denotes development length, that is calculated according to ACI 12.2 ( excluding the modification factor).The least lap length is 12 inches.ģ. According to ACI 318, the tension lap splices are available in two classes Class A and Class B ( Table R12.5.2, ACI 318) for which the lap length should be as follows: Under this circumstance, the lap splice demonstrates different interaction based on the concrete strength, grade of steel reinforcement, location, bar size ,and spacing. As a result, a continuous line of reinforcement is created. In a tension lap, the force is transmitted from the reinforcement bars to the concrete with the bond and in turn forces back to the reinforcement. Lap length in Tension: The lap splice length in tension reinforcement is measured according to ACI 12.15.

Reinforcement Lap: Reinforcement lap follows a lapping length not below 500mm.Ģ. Square Mesh Laps: The square mesh lap follows an overlapping length not below 225mm. Also Read: Guidelines for measuring steel reinforcement & its quantity in slab, beams, columns & footing These overlap are created in T or L intersections at a width of the trench mesh. The least length to be overlapped is 500mm.

Trench Mesh Laps: The trench mesh lap is found in concrete reinforcement. Lap lengths for several splices - The lap splices are categorized as follow :Ĭontact Splices: Under this type, the reinforcement bars remain in contact and wired collectively. Typically, 12m means the stock length that is rigid to allow smooth transportation to the site as well as handling.ġ. The lap length is measured for those concrete sections whose length remains in excess of 12m. Measurement of Lap Length or Overlapping Length: This length overlapped with two bars in concrete sections is known as lap length or overlapping length and separate calculations are done for overlapping length for beams, columns and slab sections.

Aci rebar lap splice length