ACI CODE 318-99 PDF

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts. Publication: Technical Documents. However, a newer version of this document exists. This document was replaced by EB ACI Materials Journal. CI Magazine.

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Pro data file. Refer to D. Suitable Member Properties for more details. Beams are designed for flexure, shear and torsion. Each member is divided into equally spaced sections along its length and the design is performed at each of these locations.

The user can specify the number of segments to be considered between 4 and 25 for each span. Sections are also taken at face of supports and at locations of the maximum positive and negative bending moments. The main longitudinal reinforcement is calculated for both sagging and hogging moments on the basis of the section profile and parameters defined in the Design Brief. Compression reinforcement is provided where required.

The design of a beam is based on an envelope of the design forces and thus at each of the defined sections, the program determines the required area of steel for both the maximum hogging moment and maximum sagging moment values from the analysis.

The beam is then divided into sub-beams, those that can use the same reinforcement cage and having. For each sub-beam, the sections that have the largest sagging and hogging moments are identified and the most efficient reinforcement pattern is calculated for the range of bars specified in the Design Brief.

The program does not have a limit on the number of bars in any one layer as long as the spacing requirements specified in the code are satisfied. The program can handle a maximum of 4 layers of reinforcement, two each for the top and bottom layers. The program then performs a check at each of the defined sections to determine the number of bars, if any, that can be curtailed.

The reinforcement bars will not be curtailed at these sections in the following cases:. Stirrups are designed to resist the major axis shear force envelope, Fz, and optionally the torsional moments induced in the beam. The minor axis shear forces and torsional moments are not considered in the design. The bar size for shear stirrups and the minimum number of shear legs to be provided are specified in the Design Brief.

Therefore the required spacing for minimum stirrups can be defined. The program then checks each section to determine the shear stress v and concrete shear capacity vc.

Adjacent sections of the same type are grouped into zones. For non minimum stirrup zones, the shear stirrups are designed for the maximum shear force within that zone. If torsion is to be considered, the program checks whether the threshold torsion has been exceeded at each section and if so determines the corresponding reinforcement required and then adds this to the requirements for shear.

The number of shear legs and the shear link size is specified in the Design Brief. Therefore the required spacing for minimum links can be defined. The program then checks each section to determine the shear stress, v , and concrete shear capacity, v c.

From this, the section is classified as either minimum link or a high shear section. For non minimum link zones, the shear links are designed for the maximum shear force within that zone. If necessary, additional legs may be added to the shear links in order to restrain tension or compression reinforcement.

Anchorage and bond lengths are calculated in accordance with the requirements of chapter They can be displayed graphically on the main reinforcement diagram and are used for the schedule table. Design for Flexure The main longitudinal reinforcement is calculated for both sagging and hogging moments on the basis of the section profile and parameters defined in the Design Brief. The beam is then divided into sub-beams, those that can use the same reinforcement cage and having Same overall beam size Same cover requirements For each sub-beam, the sections that have the largest sagging and hogging moments are identified and the most efficient reinforcement pattern is calculated for the range of bars specified in the Design Brief.

Design for Shear and Torsion Stirrups are designed to resist the major axis shear force envelope, Fz, and optionally the torsional moments induced in the beam. Minimum shear links required,V, for shear forces between these values. Anchorage and Bond Lengths Anchorage and bond lengths are calculated in accordance with the requirements of chapter Chapter 3 - Materials 3.

If columns require different loadcases for sidesway, then they should be designed in separate design groups. Parent topic: D. American Concrete design per ACI -

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Pro data file. Refer to D. Suitable Member Properties for more details. Beams are designed for flexure, shear and torsion. Each member is divided into equally spaced sections along its length and the design is performed at each of these locations. The user can specify the number of segments to be considered between 4 and 25 for each span. Sections are also taken at face of supports and at locations of the maximum positive and negative bending moments.

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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts. Publication: Technical Documents. Keywords: building codes-structural concrete. Abstract: Note: A newer version of this document exists. ACI Materials Journal. CI Magazine. ACI Collection Online.

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