Question

The following figure shows the arrangement of formwork for casting a cantilever RC beam. \includegraphics[width=0.5\linewidth]{65image.png} The correct sequence of removing the Shores/Props is

• A. \( S1 \rightarrow S2 \rightarrow S3 \rightarrow S4 \rightarrow S5 \)
• B. \( S5 \rightarrow S4 \rightarrow S3 \rightarrow S2 \rightarrow S1 \)
• C. \( S3 \rightarrow S2 \rightarrow S4 \rightarrow S1 \rightarrow S5 \)
• D. \( S3 \rightarrow S4 \rightarrow S2 \rightarrow S5 \rightarrow S1 \)

Hint:

For cantilever beams, always remove formwork from the free end towards the fixed end to ensure structural safety.

Answer 1

The Correct Option is B

Step 1: In the case of a cantilever beam, the removal of props must follow the sequence that minimizes the impact on the structural stability. Step 2: The correct approach is to remove the props starting from the free end of the cantilever (farthest from the support) and progressing toward the fixed end. This ensures that the structure is not subjected to undue stress concentrations. Step 3: According to the figure, the farthest prop is \( S5 \), and the nearest to the fixed support is \( S1 \). Hence, the props should be removed in the order: \[ S5 \rightarrow S4 \rightarrow S3 \rightarrow S2 \rightarrow S1 \] Conclusion: The correct sequence of removing the shores/props is option (B).