It is common that W-shape columns in a multistory building change sizes along th

Question

It is common that W-shape columns in a multistory building change sizes along the height because those in the lower stories need to carry higher forces. It is also common that columns be spliced every two to three stories because it is not practical to transport (on freeway) very long members from the fabricator’s shop to the construction site. Consider a situation that a W12×336 column in the lower portion is to be spliced to a W12×170 column above by using the connection detail shown in the AISC Manual Table 14-3, Case VIII-A.

(A) What are the nominal and actual depths of the W12×336 shape? Compare these to the nominal and actual depths of the W12×170 shape and comment on what you observe.

(B) Prepare a professional drawing and draw to scale to reproduce the figure like that shown in Table 14-3, Case VIII-A. Simply copy the weld symbols there at this stage

Explanation / Answer

(A)W12x336

Nominal depth = 36 in (first part in designation)

Actual depth = 35.6 in (as in AISC manual)

Weight per linear foot = 135 lb/ft (the second part in designation)

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