In this case, the structural engineer must determine the embedded depth of the rebar and the appropriate product to anchor the rebar to the existing concrete. Standard splice lengths do not apply when the rebar needs to be drilled into the concrete. Once the pour is completed and the concrete has begun to harden (within a few hours of the pour), the wiring material has no further purpose. So eliminating the anchorage value, the lap length 58d 29d 40d. The lack of specific requirements for the wiring material or specification of the wire wrapping method may seem surprising at first, but the wire's sole purpose is to hold the rebar temporarily in place. Lap splice length in a footing Lap length for concrete of 1:2:4 Nominal mix: The Lapping length in tension (MS bar mild steel bar) including anchorage value is 58d. The code requirements for the wiring material and fastening method are brief and note only that the wiring method employed should "secure" the rebar in place. Wiring Requirements for Lap Splicing Rebar Other types of splices that are code-compliant include mechanical splices and welded splices. The following are the IBC/ACI splice length requirements for the most common type of lap splice, the contact splice. All splice locations must be specified in the structural plans before approval. Therefore, either the IBC code sections governing concrete or ACI 318-14, current as of 2016, provide reliable information about lap splice code requirements.Ī structural engineer will take into account the standard requirements as well as exceptions for critical stress points, different splice length requirements when connecting rebar of different diameters, and requirements for staggering splices to prevent congestion at overlap points, which can result in inadequate concrete flow into the splice area. ACI code section 318-14, which governs rebar splicing, has been incorporated without meaningful modification into the corresponding concrete section of the 20 IBC. IBC code requirements are almost identical to the American Concrete Institute (ACI) codes. Although it's imperative to check your local code for detailed compliance requirements, most codes are based on the IBC ( International Building Code). In almost every construction situation, overlap lengths are subject to local building codes. Note, however, that overlap requirements vary with both rebar size and the specific structural application. Specified yield stress of the reinforcement or the anchor bolt, psi (mPa). From a structural point of view, the most critical aspect of a lap splice is the overlap length. The minimum length of lap splices for reinforcing bars in tension or compression, lld, shall be calculated by Equation 2 1-2, but shall not be less than 15 inches (381 mm). Find a library where document is available.The lap splice, as the name suggests, is created by overlapping two lengths of rebar, then wiring them together.Based on the results from the tested beams, average bond strengths and critical splice lengths for FRP bars with different diameters are developed. The ultimate strength analysis method can be used to predict the maximum stress in the spliced FRP bars. Tests indicated that the FRP stress limit is directly proportional to the splice length therefore, the critical splice length can be predicted from FRP bar mechanical properties and a few splice test results. An evaluation of the existing recommendations for the spliced FRP bars (ACI 440.1R-03, CAN/CSA-S806-02, ISIS-M03-01, and CAN/CSA-S6-00) also is presented. The effects of the bar diameter and splice length on the bond strength are investigated. The beams were reinforced with spliced carbon or glass FRP bars. The test results from 12 large-scale concrete beams are presented. The bars are intended as reinforcement of flexural concrete members. This study investigates the bond behavior of confined spliced fiber reinforced polymer (FRP) bars. Tensile Lap Splicing of Fiber-Reinforced Polymer Reinforcing Bars in Concrete
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