What is flange width

Skip to content Civil Engineering Learn Online. T beams and L beams The portion of the slab which acts integrally with the beam to resist loads is called as Flange of the T-beam or L-beam. Thickness of the Flange D f The thickness of flange of the T-beam is equal to the thickness or depth of the slab forming the flange of the beam.

Effective Width of the Flange Effective width of the compression flange of the flanged beam The effective width of the compression flange of the flanged beam can be calculated as follows Cl. Like this: Like Loading Anonymous 17 Jun Reply. Subject he bekar h yo salo Loading Leave a Reply Cancel reply. Loading Comments Email Name Website. In other words, the lesser value from the two methods of calculation should be used.

Isolated T-beams and L-beams. In some cases, isolated T-beams or L-beams are encountered. Fig 9. The fig. From the fig. The stringer beam of a staircase is another example of an isolated T-beam. A part view of such a staircase is shown in fig. Cl Where b is the actual width of the flange. Obviously, b f cannot be greater than b. So at this stage we are able to calculate the effective width b f of the flange for different types of T-beams and L-beams.

In the next section we will start the discussion on the analysis of these flanged sections. Labels: effective flange width , flanged beams , foot bridge , Isolated T-beams and L-beams , L-beams , point of contra flexure , T-beams. Unknown July 8, at PM. Unknown September 22, at PM.

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T-beams are formed when reinforced concrete floor slabs, roofs, and decks are cast monolithically with their supporting beams. Generally, formworks are placed for the bottom and sides of the beams and soffit of slabs. Bent up bars and stirrups of the beam are extended up into the slab. After that, all the elements are cast at once, from the lowest point of the beam to the top of the slab. The part of the slab around the beam, called flange, would work with the beam and resist longitudinal compression force.

Interior beams have flanges on both sides and are termed as T-beams, while edge beams have flanges on one side and are called L-beams. The part of the beam extending below the slab is called a stem or web. The design of the reinforced concrete T-beams is similar to that of a rectangular reinforced concrete beam except for flanges that need to be considered in the former type of beam.

The effective flange width b e of a T-beam needs to be determined in order to begin the design process. In Figure-1, the flange of the isolated T-beam is a little bit wider than the T-beam stem, and the entire flange is effective in resisting compression. However, in Figure-2, the flange width is large; hence, parts of the flanges situated at a distance from the stem do not take their full share in resisting compression, and the stresses keep varying.

The variation of stresses leads to tedious calculations; that is why a uniform stress distribution is considered over a smaller width of the effective flange, see Figure According to , the effective flange width of an internal T-beam should not exceed the smallest of:. According to , the effective flange width of an edge beam should not exceed the smallest of:.

If a T-shaped reinforced concrete beam is subjected to negative moments at supports, the beam is designed as a rectangular section because the concrete in tension is neglected. The width of the rectangular section is equal to the stem web width, see Figure However, when the T-beam is subjected to a positive moment, the flange is located in the compression zone hence the beam should be designed as a T-beam, see Figure A T-section beam design involves calculating the dimensions be, h f , h, and b w of the beam and the required reinforcement area As.