What is bearing stiffener?

Bearing stiffeners are required in a plate girder when a concentrated load, applied to either the top or bottom flange, exceeds the local yielding, crippling, or sidesway buckling capacity of the web.

What are the different types of stiffeners?

There are two principal types of stiffener:

  • Longitudinal web stiffeners, which are aligned in the span direction.
  • Transverse stiffeners, which are aligned normal to the span direction of the beam.

What is a transverse stiffener?

As previously discussed, transverse stiffeners for shear (i.e., web stiffeners) are used to increase shear capacity in a beam web. Using the criteria of this section, a designer selects the spacing, a, of the stiffeners to develop the required shear strength in the beam.

What are Web stiffeners used for?

Web stiffeners are nothing more than wood blocks. They’re either made out of lumber, wood structural panels or APA Rated Rim Board. Their purpose is to reinforce the webs of I-joists at different locations.

Why are stiffeners used?

Stiffeners are used to prevent web buckling at supports or concentrated loads. properties in steel connections. Stiffeners are used to strengthen a steel beam or a column. Stiffeners are usually plates.

How do you calculate stiffeners?


  1. Section modulus = Zxx = mm.
  2. 725 x 9.81 x 0.7.
  3. UDL acting on beam (Channel) W = 4978.58 N-m.
  4. Max. Bending moment =
  5. permissible bending stress = Z req =
  6. Section usign as vertical stiffener =
  7. Distance between stiffeners = W =
  8. The resultant moment of Inertia is calculated usign below formula.

Why do we use stiffeners?

What’s a stiffener?

noun. a person or thing that stiffens. any substance, as starch or buckram, that serves to stiffen fabric.

Do I need web stiffeners?

Web stiffeners are required at all supports on 22- and 24-inch joists. Web stiffeners are required under concentrated loads applied to the tops of joists between supports, or along cantilevers beyond the support, when the concentrated load exceeds 1500 pounds.

Why stiffeners are used in base plate?

Columns are elements of steel structures often subjected not only to axial force, but also to bending moment, which are transferred into foundations. When the force transferred into foundation grows significantly, the single base plate becomes insufficient, so vertical stiffeners of base plate are required.

What is a stiffener drink?

A stiffener is an alcoholic drink which revives you; the word first appears in a 1928 novel by Dorothy L. Sayers. That concludes our list of great synonymous for drunkenness and other drink-related words.

What is stiffener in PCB?

It’s important to understand that the PCB stiffener is not an integrated part of the electrical circuit board design — it exists to offer mechanical support. A stiffener is called for when you need: Greater thickness in your flex circuit in certain areas. To constrain bend areas to specific predefined locations.

How are web stiffeners used in structural engineering?

As previously discussed, transverse stiffeners for shear (i.e. web stiffeners) are used to increase shear capacity in a beam web. This is accomplished by providing out of plane stiffness with transverse web stiffeners. Figure shows transverse stiffeners (aka web stiffeners) in a bridge application.

Can a web stiffener be attached to both sides of a plate?

Stiffeners can be attached on one side of the plate (single sided), or on both sides (double sided). Usually bearing stiffeners are double sided, while intermediate web stiffeners are single sided.

How are transverse stiffeners used to strengthen the web?

Most of these can be strengthened with the use of transverse stiffener pairs (perpendicular to the web). Per section J10.8, “…compressive forces… design in accordance with the requirements of Sctions E6.2 and J4.4.

Is there a limit on the slenderness of a web stiffener?

It does seem, however, that there should be some limit on slenderness to prevent any possible buckling due to out of plane buckling. You should take the time to read the paragraph in SCM G2.2 that deals with the details associated with stiffener design. Note that it is common to stop the stiffeners short of the tension flange.