Structural Engineering & Statics
where the load goes
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One support too many — page 2

Essays 25 to 26 of 26 on this thread, in the same order.
the storey that cannot driftk = 0.774N꜀ᵣ = 16.46 EI/L²the storey that cank = 1.317N꜀ᵣ = 5.69 EI/L²the same column, 2.9 times the load — the restraint is the whole of the difference Stability

Held, and not held

One horizontal restraint at the head of a storey, carrying no vertical load whatever, moves the critical load of the columns beneath it by a factor of 2.89. Effective length is a property of the frame, not of the member.

 P = 6000 kNfrom 10 storeys abovea = 3 mstrength wants 1.94 mstiffness wants 2.55 mslope 4500 kN1500 kN13500 kNm under the column12 m Structural form

The column that stops

A load path that runs straight to the ground costs almost nothing. Interrupting one costs depth in proportion to the square root of the load times the distance it is moved — and the interruption's own deflection becomes the settlement of everything standing on it.

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