#Rebar lap splice requirements full
#Rebar lap splice requirements code

Type 1 splices may not be used within the plastic hinge zone nor within a beam-column joint of intermediate or special reinforced masonry shear walls or special moment frames. The IBC stipulates that mechanical splices be classified as Type 1 or 2 according to Section 21.2.6.1 of ACI 318 (ref. The 2003 IBC modifies the MSJC requirements for welded and mechanical splices as follows. 7 (M#19 and M#22) reinforcing bars and 1.5 for No.

#Rebar lap splice requirements full

The bar ends are required to terminate in flat surfaces within 1 ½ degrees of a right angle to the axis of the bars and be fitted within 3 degrees of full bearing after assembly.įor use in Equation 5, the reinforcement size factor, γ, is taken equal to 1.0 for No. End-bearing splices rely on the transmission of compressive stress by bearing of square cut ends held in concentric contact by a suitable device. Reinforcing bars can also be spliced using end-bearing splices, but only in members containing closed ties, closed stirrups or spirals for bars subject to compression only. Mechanical splices are required to have the bars connected to develop in tension or compression, as required, at least 125% of the specified yield strength of the bar. In practice, however, welding tends to be an expensive splicing option.įinally, mechanical splicing of reinforcement typically employs proprietary couplers specifically designed for this application. All welding is required to conform to AWS D 1.4 (ref. Welded splices require the bars to be butted or shortly lapped and welded to develop in tension at least 125% of the specified yield strength of the bar. (203 mm).Īs an alternative to lap splicing, reinforcing bars can be spliced by welding. When noncontact lap splices are used, the bars must be spaced no farther apart than one-fifth the required length of lap nor more than 8 in. 9 (M#29) are required to be spliced using mechanical connectors.

Because the detailing requirements for these two codes can be significantly different, designers using the 2003 IBC are encouraged to compare these requirements to the corresponding 2006 IBC requirements.įor use in Equation 2, the reinforcement size factor, γ, is taken equal to 1.0 for No. For this reason, the following sections present the requirements for both the 2003 IBC and 2006 IBC for both allowable stress and strength design.

#Rebar lap splice requirements code

As a result, the minimum lap and development lengths can vary considerably from one code to the next as well as from one design method to another. In addition, these detailing requirements have been frequently revised in recent years. The required length of lap or development is determined according to the design procedure used and type of detail employed. Reinforcing bars may be spliced by lapping the reinforcement, by proprietary mechanical splices or by welding. The development of the reinforcing bars relies on mechanical interlock of the bar deformations, hook, and/or anchor along with sufficient masonry cover to prevent splitting of the masonry. Reinforcement can be developed by embedment length, hook, or mechanical anchoring device. Splicing of reinforcement serves a similar purpose to adequately transfer stresses from one reinforcing bar to another. Minimum development lengths are necessary to adequately transfer stresses between reinforcement and the grout or mortar in which it is embedded.