![]() ![]() Development for All Flexural Reinforcement In addition, these requirements help minimize any loss of shear capacity or ductility resulting from flexural cracks that tend to open early whenever reinforcement is terminated in a tension zone. The following requirements of the ACI 318 Building Code for the development of reinforcement were proposed to help provide for shifts in the location of maximum moment and for peak stresses that exist in regions of tension in the remaining bars wherever adjacent bars are cut off or bent. The critical sections for development of reinforcement in flexural members are located at the points of maximum stress and where the reinforcement terminates or is bent. Hooks can be used to assist in the development of tension bars only. The calculated tension or compression force in each reinforcing bar at any section must be developed on each side of that section by a development length Ld, or by end anchorage, or both. The ACI 318 Building Code requirements therefore reflect the significance of average bond resistance over a length of bar or wire sufficient to develop its strength (development length). Despite assumptions made in the past to the contrary, bond stress between concrete and reinforcing bars is not uniform over a given length, not directly related to the perimeter of the bars, not equal in tension and compression, and may be affected by lateral confinement. Merely move the mouse pointer to the desired cell to view the contents of that particular "comment box".Steel reinforcement must be bonded to the concrete sufficiently so that the steel will yield before it is freed from the concrete. (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. This program follows the procedures and guidelines of the ACI 318-11 Building Code, Chapters 12 and 21.Ģ. 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. There is also a worksheet which contains reinforcing bar data tables. 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. "REBARS" is a spreadsheet program written in MS-Excel for the purpose of determining reinforcing bar development and splice lengths. "REBARS" - REINFORCING BAR DEVELOPMENT AND SPLICE LENGTHS ![]()
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