The ACI Code ACI for modifications of some of the detailing;. (vi) The China Code GB in some respects of detailing. Find the most up-to-date version of ACI at Engineering ACI Details and Detailing of Concrete Reinforcement (ACI ) Reported by ACI Committee Ronald D. Flach Chairman Michael.
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Guide for the use of s A model for the evolut Goettsche Paul Gordon Edward S. It is divided into three parts: It then establishes certain standards of practice afi both the structural and placing drawings.
Part B—Responsibilites of the detailer Chapter 3—Placing drawings, p. All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, avi, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.
This added degree of sophistication has resulted in more complex structures being designed and built with structural members that have long spans, shallow depths, and contain a high percentage of reinforcing steel.
In the past, during the course of developing placing drawings, the detailer often suggested solutions in areas where the details were incomplete and where the reinforcing steel appeared to have constructability problems.
Unfortunately, many problems do not surface during the detailing phase but rather occur during construction. This standard presents values in 135-80 and SI units. Hard metric values are usually not exact equivalents; therefore, 31-80 system is to be used independently of the other.
Combining inch-pound and hard metric values can result in nonconformance with the acci. Soft metric values are exact equivalents, so combining inch-pound and soft metric values conforms to the standard.
The structural drawings and the project specifications form a part of the contract aaci. Structural drawings must contain an adequate set of notes and all other essential information in a form that can be quickly and correctly interpreted. These drawings must convey definite instructions and show rein- forcing bars and welded-wire fabric. Structural and placing drawings may be combined. Anchorage length of reinforcing steel and location and length of lap splices; and 2. Type and location of mechanical and welded splices of reinforcing steel.
Other media providing improved reproducibility or durability, such as microfilm, electronic files, ink, tracing cloth, ai polyester film, can also be used.
All sheets in any one set of drawings should be the same 351-80. There are two well-recognized sets of standard sizes. Border lines are inside sci dimensions. Requirements for placing drawings are in Part B, addressed to the detailer. Drawings that can be enlarged or reduced in reproduction should show a graphic scale, as well as a descriptive one, to aid the user. Structural drawings and project specifications shall also show concrete dimensions, anchorage length of reinforcing steel and location and length of lap splices, type and location of mechanical and welded splices of reinforcing steel, concrete cover for the reinforcing steel, required joints, and any other information needed for the preparation 315-880 the placing drawings.
In addition to these requirements, structural drawings of beams, girders, and columns must also show the information presented below. Show sections for beam-column 31-580, where necessary.
In continuous beams, the number and spacing of top bars to be placed in T-beam flanges slabs for crack control shall be shown, if so required by the design. Method of splicing shall always be defined clearly, showing arrangement of splices, type lap, mechanical or weldedlength if lap spliceand stagger.
Orientation of afi steel in two-way symmetrical columns shall be shown when reinforcing steel is not two-way symmetrical. Drawings must show the dimensions of concrete protection for all reinforcing steel.? Where separate placing drawings are prepared, structural dimensions may be omitted, following the same practice as for buildings see Section 3. The list of bars must show the 315-0 of pieces, size, length, mark of bars, and bending details of all bent bars. The list of welded wire fabric must show the mark, style, width, length, and number of pieces.
Reinforcing steel for larger structures is sometimes detailed, fabricated, and delivered by units, for example, footings, abutments, piers, and girders.
The reinforcing steel list may be subdivided similarly. If the structure is sufficiently large, a separate drawing and reinforcing steel list is usually made for each unit. Reinforcing steel for foundations, piers, abutments, wing walls, and slabs are usually shown on a plan, section, or elevation view on the drawings.
Cross sections must be provided for clarification where necessary. The reinforcing steel list is a complete summary of materials required. All bars should appear at least once in a plan or elevation view and in a sectional view, or both. For reference data on reinforcing bars and welded wire fabric from industry sources, refer to the Supporting Reference Data section.
This section includes specific information on applicable ASTM specifications, coated reinforcing bars, common styles and design data for welded wire fabric, and reinforcing bar supports. Reinforcing steel for structures designed under the provisions of ACIACIand other similar documents can generally incorporate the direction given in this standard unless otherwise prohibited by the provisions of the respective related documents.
Ack limitations of equipment and production efficiency have led to the establishment of certain fabrication tolerances that can be met with standard shop equipment. These standard tolerances are shown in Fig. Where more restrictive tolerances are required than those shown in the referenced figures, they shall be indicated in the contract documents.
See Table 1 and Fig. For cast-in-place bridges, required clear space is the larger of 1. Other tables in the supporting afi data section similarly give the same information for beams designed under the provisions of the AASHTO bridge specifications.
These types include open stirrups and closed stirrups or stirrup-ties Fig. Stirrups are most often fabricated from reinforcing bars, but may also be fabricated from welded-wire fabric. There are various permissible methods of anchorage, sci the most 3315-80 is to use one of the standard stirrup-tie types as shown in Fig. In designing the anchorage, allowance must be made to ensure that the ends of the stirrup hook are fully encased in concrete, as when hooks turn outward into shallow slabs.
Where the design requires closed stirrup-ties for shear, the closure may consist of overlapped, standard 90 degree end hooks of one- or two-piece stirrups, or properly spliced pairs of U-stirrups. Where the design requires closed ties for torsion, the closure may consist of overlapped, standard degree hooks of one- or two-piece ties enclosing a longitudinal bar. At least one longitudinal bar shall be located inside each corner of the stirrups or ties, the diameter of this bar to be equal to at least the diameter of the stirrup No.
Ties provided to resist radial forces resulting from bar or tendon curvature shall be anchored adequately. Splice arrangements shall be shown.
For butt-spliced systems, an allowance must be included for an increase in diameter at mechanical splices and for access to welding.
Special end preparation required for bars must be shown or specified. Where the reinforcing steel area required above is different from that in the column below, the structural drawings must clearly show the extension required if any of all reinforcing bars above and below the floor level see also Section 2. The slope of the inclined portion providing the offset shall not exceed one in six.
ACI detailing manual in SearchWorks catalog
Where column verticals are offset bent, additional ties are required and shall be placed not more than 6 in. For practical purposes, three closely spaced ties are usually used, one of which may be part of the regularly spaced ties, plus two extra ties. General arrangements of vertical bars and all tie requirements shall be established by the structural drawings.
Reinforcing steel at least equal in area to that in the column above must be extended from the column below to lap bars above by the required lap length or butt splices must be provided. Vertical bars from the column below, terminated for any reason, are cut off within 3 in. According to ACI M315-08 clear spacing between spiral turns shall not exceed 3 in.
Minimum diameters to which standard spirals acci be formed and minimum diameters that are considered collapsible are shown below for various sizes of spiral bars. Plain or deformed bars or wire can be used to manufacture spirals. Spiral bar diameter, in. A bundle is defined as a group of parallel bars bundled in contact to act as 315-8 unit. Not more than four bars can be grouped into one bundle. Butt splices or separate splice bars should be ack.
Bundled bars must be tied, wired, or otherwise fastened to ensure that they remain in position. All bundles of column verticals must be held by additional ties above and below the end-bearing mechanical splices and any short splice bars added for tension should be tied as part of the bundle within the limitation of the number of bars in a bundle.
Bundled bars shall be enclosed within ties. Ties smaller than No. Design and detail information on bundled bars as column verticals is provided in a table in the supporting reference data section. A previous calculation approach, from ACI M also remains acceptable.
Sufficient information shall be presented on the structural drawings and in the project specifications to allow detailing of bars at splices and embedment locations without referencing back to the code. Tables in the supporting reference data section give values of tension development lengths and tension lap splice lengths of straight bars.
Values of tension acci and tension lap splice lengths in the tables are based on the provisions in ACI The tables use the terminology Cases 1 and 2.
Cases 1 and 2, which depend on the type of structural element, concrete cover, and the center-to-center spacing of the bars, are also defined in the tables.
Separate tables are included for uncoated and epoxy-coated bars. There are no special development requirements in ACI M for zinc-coated galvanized bars and they should be treated as uncoated bars.
For lightweight aggregate concrete, the values in the tables zci have to be modified by the applicable factor ACI This information can be shown by dimensioning cut-off locations and including tables of applicable lap splice lengths. In beams or girders, splices should preferably be made where the stress in the bar Spirals are used primarily for columns, piers, and drilled caissons, but are also used in piles. Continuously wound, reinforcing steel in the form of a circular helix not meeting ACI M definition of a spiral may be used in these structures as tie reinforcement.
Such reinforcing steel, sometimes referred to as continuous ties, is usually specified with a large pitch. Standard arrangements of ties for various numbers of vertical bars are shown in Fig. The arrangements of one-piece ties shown in Fig. Preassembly is preferred only for the common designs employing one-story-length vertical bars all lap spliced at or near one point above the floor line.
With staggered butt splices on large vertical bars in twostory lengths, practical erection limitations usually require that column ties be assembled on free-standing vertical bars.