The correct answer is: A. 5%
A battened column is a column that is strengthened by the addition of battens, which are horizontal or diagonal members that are attached to the column. Battens help to distribute the load more evenly across the column, which increases its effective length.
The effective length of a column is the length of the column that is actually resisting the load. The effective length is always less than the actual length of the column, due to the effects of buckling. Buckling is a type of failure that occurs when a column is subjected to a load that is greater than its critical load. The critical load is the maximum load that a column can support without buckling.
The effective length of a battened column is increased by the addition of battens. This is because battens help to prevent the column from buckling. The increase in effective length is typically in the range of 5% to 10%.
The following are the possible answers to the question:
- A. 5%
- B. 10%
- C. 15%
- D. 20%
The correct answer is A. 5%. This is because the effective length of a battened column is increased by the addition of battens. The increase in effective length is typically in the range of 5% to 10%.