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2 An axial load P is supported by a short W8 3 40 column
Chapter 1, Problem 1.22(choose chapter or problem)
An axial load P is supported by a short \(\text { W8 } \times 40\) column of crosssectional area \(A=11.7 \mathrm{in}^{2}\) and is distributed to a concrete foundation by a square plate as shown. Knowing that the average normal stress in the column must not exceed 30 ksi and that the bearing stress on the concrete foundation must not exceed 3.0 ksi, determine the side a of the plate that will provide the most economical and safe design.
Questions & Answers
QUESTION:
An axial load P is supported by a short \(\text { W8 } \times 40\) column of crosssectional area \(A=11.7 \mathrm{in}^{2}\) and is distributed to a concrete foundation by a square plate as shown. Knowing that the average normal stress in the column must not exceed 30 ksi and that the bearing stress on the concrete foundation must not exceed 3.0 ksi, determine the side a of the plate that will provide the most economical and safe design.
ANSWER:
Step 1 of 4
To calculate the safe and economic size of bearing plate we will first calculate the maximum possible load that can act on the column. From the estimated load, we will then calculate the minimum bearing area needed for the computed load.