![]() Merely move the mouse pointer to the desired cell to view the contents of that particular "comment box". (Note: presence of a “comment box” is denoted by a “red triangle” in the upper right-hand corner of a cell. This program contains numerous “comment boxes” which contain a wide variety of information including explanations of input or output items, equations used, data tables, etc. The "Rebar Data" worksheet contains tables of reinforcing bar data which include various bar properties, reinforcing bar areas based on spacing, tension development and splice lengths for straight bars, tension development lengths for 90 degree standard hooks, tension lap splice criteria, compression development and splice lengths for straight bars, maximum spacing for column ties, and various plain welded wire fabric properties.Ĥ. A complete table of reinforcing bar development and splice lengths is also created for #3 through #18 bars.ģ. The "Calc Development" worksheet, for a given reinforcing bar size, determines the straight development and splice lengths for a "top" bar and an "other" bar in tension, the straight development and splice lengths for the bar in compression, and the tension development length of the bar as a standard hook, all at one time. The minimum lap length Ls is expressed as a. This program follows the procedures and guidelines of the ACI 318-11 Building Code, Chapters 12 and 21.Ģ. Tension lap splices are classified in two classes, A and B, depending on the stress in the bars to be spliced. This program is a workbook consisting of three (3) worksheets, described as follows:Ĭalc Development - Reinforcing Bar Development and Splice Lengthsġ. This version is based on the ACI 318-11 Code. Compared to a lap splice of a pair of single bars, the lap length for an. There is also a worksheet which contains reinforcing bar data tables. ACI 318-087 permits only one bar within a bundle to be spliced at any section. The provisions for development and splice lengths are included for high seismic risk applications per ACI 318-11, Chapter 21. Also, the development length for standard hook bars is determined. Specifically, the development lengths and splice lengths for straight bars in tension as well as compression are determined. Regarding ACI 440 requirements for Class B bars the lap splice length ought to be 1.6ld. "REBARS" is a spreadsheet program written in MS-Excel for the purpose of determining reinforcing bar development and splice lengths. Tension development lengths and tension lap splice lengths are calculated per ACI 318-1 4, Sections 25.4.2 and 25.5, respectively, with bar sizes limited to 3. Load transfer occurs between the bars and the concrete by bond stresses. The minimum lap length for compression bars must be 12inches."REBARS" - REINFORCING BAR DEVELOPMENT AND SPLICE LENGTHS The lap length for compression lap splice is calculated as per ACI 12.16.1 as msquared48 (Structural) 17 Dec 11 15:46 Just tied sufficiently to maintain the alignment of the bars, to include the lap requirement, and keep the cage from falling apart during the pour. Where, ld= development length, which is calculated as per ACI 12.2 ( Without taking into consideration the modification factor).The minimum lap length is 12 inches 3. A lap splice is the length required to overlap bars to transfer load from one bar to the other. As per ACI 318, the tension lap splices are classified into two classes Class A and Class B ( Table R12.5.2, ACI 318) for which the lap length are as follows: ![]() Hence, the lap splice, in this case, shows varied interaction depending on the concrete strength, grade of steel reinforcement, location, bar size ,and spacing. This hence results in a continuous line of reinforcement. In a tension lap, the force is transferred from the reinforcement bars to the concrete by the bond which in turn force back to the reinforcement. The lap splice length in tension reinforcement is calculated as per ACI 12.15. Also Read: Methods of Splicing Reinforcement Bars 2.
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