Structural Engineering & Statics
where the load goes
Concept

Beam column — where it appears

A member carrying axial compression and bending at once, so that the deflection produced by the moment becomes a lever arm for the axial force. Its capacity is an interaction rather than the smaller of two separate checks, and the amplifier 1/(1 - N/N_cr) is what connects them.

Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.

02000040000600008000010000012000014000016000000.20.40.60.81joint rotational stiffness, kN·m/radend moment ÷ wL²/126.04%30%62.16%rigid boundarysemi-rigidfixed ended

The redistribution nobody chose

A beam designed as simply supported, on connections that are not pins, has end moments the analysis never predicted and a mid-span moment smaller than it was sized for. Usually that is safe. It is never intentional, and there is one direction in which it is not safe at all.

connections · joint classification 259 kN95299 kN83221 kN112wind 3 N/mmtop moves 100 mmleewardwindwardaxial load from the guys 801 kN · deflection exaggerated 0.5×

Held by something that goes soft

A guy is a cable, so it has no stiffness of its own — what resists a mast's movement is the guy's geometry changing, and how much of that there is depends on the tension already in it. Wind pushes the mast towards the leeward guy, which is the one losing tension.

structures · guyed mast

Named alongside it

The objects these essays reach for when they reach for this one.

ServiceabilityAnchorBucklingCableClassificationConnectionDeflectionElastic supportGeometric stiffnessGuyed mastJoint stiffnessMoment redistribution

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