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TRS001 BASE STORY Slenderness check failure.
Slenderness control under the influence of axial force, tensile force and axial pressure force in steel truss design according to TBDY 2018, Design, Calculation and Construction Principles of Steel Structures (GKT and For truss members designed based on compression, or tension, the effective slenderness ratio control is made according to CYTHYE 2016 (GKT & YDKT), AISC 360-16 (ASD and & LRFD), or EN 1993-1-1 regulations It is done by taking into account the buckling conditions.
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In TBDY 2018 and ÇYTHYE 2016, it was stated that the slenderness ratio of pressure elements should not exceed the limit value of KL/i ≤ 200.
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codes.
According to AISC 341-16 and AISC 360-16, the effective slenderness ratio KL/r ≤ 200 for compression members should be satisfied.
According to AISC 341-16 and AISC 360-16, the effective slenderness ratio KL/r ≤ 300 for tension members should be satisfied.
ideCAD Structural automatically controls checks the slenderness ratio according to axial tension and pressure or compression conditions.
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Solutions:
If the upper heads of the trusses whose name and floor are given do not provide the slenderness ratio, a brace system can be created to shorten the lateral retention lengths of the upper head of the trusses. As the element size decreases, the slenderness value will decreaseLaterally unbraced length of the header truss element can be reduced by using steel braces.
If the lower headings footer element of the trusses whose name and floor are given do does not provide the slenderness ratio, a stability element can be defined to shorten the lateral retention lengths of the lower heading of the trusses. As the element size decreases, the slenderness value will decrease.Laterally unbraced length.
The truss member cross-section size can be increasedenlarged.
By changing the shear mesh typetruss pattern, an element that is under axial pressure compression in the support area can be switched to axial tension.
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iconsSymbols
K: Buckling coefficient effective length factor
L: Length laterally unbraced length of the element without lateral restraint
i: Radius of inertiamember
r: radius of gyration
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