![]() ![]() Where epoxy coated bars are used, lap length is also required to be increased by 50% but does not apply to the 12 in. Alternatively, equivalent means of stress transfer to accomplish the same 50% increase is permitted. ![]() The following sections present the requirements for both the 2009 IBC and 2012 IBC for both allowable stress and strength design.įurther, in regions of flexure where the design tensile stresses in the reinforcement, f s, exceed 80% of the allowable steel tensile stress, F s, the IBC requires that the required length of lap determined by Equation 1 must be increased by 50%. 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 (allowable stress design or strength design). 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. 7), covers these requirements based on the 20 editions of the IBC. TEK 12-6, Splices, Development and Standard Hooks for Concrete Masonry (ref. In addition, prestressing steel is discussed in Post-Tensioned Concrete Masonry Wall Construction, TEK 3-14 (ref. 5) includes basic material requirements, corrosion protection and placement tolerances for reinforcement used in concrete masonry construction.
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