V

b) Folded groove and curved groove i

a) Folds and bends c) Bolted angle stiffener

Figure 1.3: Typical forms of stifferiers for cold formed members and sheeting

a) Single edge fold stiffeners b) Double edge fold stiffeners

/t a) Intermediate flange stiffeners b) Intermediate web stiffeners

Figure 1.5: Typical intermediate longitudinal stiffeners 1.7.3 Cross-section dimensions

(1) Overall dimensions of cold formed thin gauge members and sheeting, including overall width b, overall height A, internal bend radius r and other external dimensions denoted by symbols without subscripts, such as ay c or d, are measured to the face of the material, unless stated otherwise.

(2) Unless stated otherwise, the other cross-sectional dimensions of cold formed thin gauge members and sheeting, denoted by symbols with subscripts, such as /iw or are measured either to the midline of the material, the system line of the element or the midpoint of the corner.

(3) In the case of sloping elements, such as webs of trapezoidal profiled sheets, the slant height s is measured parallel to the slope.

(4) The developed height of a web is measured along its midline, including any web stiffeners.

Figure 1.4: Typical edge stiffeners

Figure 1.4: Typical edge stiffeners

(5) The developed width of a flange is measured along its midline, including any intermediate stiffeners.

1.7.4 Convention for member axes

(1) In the Structural Eurocodes the general convention for member axes is: x - x along the member;

y - y axis of the cross-section; z - z axis of the cross-section.

(2) For cold formed steel members the following axis convention is used in this Part 1.3 of ENV 1993: for monosymmetric cross-sections:

- y - y the axis of symmetry of the cross-section;

- z - z the other principal axis of the cross-section; otherwise:

- u - u axis perpendicular to the height (if this does not coincide with y - y or z - z );

- v - v axis parallel to the height (if this does not coincide with y - y or z - z ).

NOTE: This differs from the axis convention used in ENV 1993-1-1 in order to give rules for torsional-flexural buckling that can be applied consistently to all cross-sections.

(3) The use of u - u and v - v axes is illustrated in figure 1.6.

\ 1 \ i

Was this article helpful?

0 0

Post a comment