If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

ANS:C - R² + T²

When designing steps in a staircase as beams, the width of the beam-like steps can be calculated based on the effective width required for load distribution. In this scenario:

• The rise (R) is the vertical height of each step.
• The tread (T) is the horizontal depth or width of each step.
• The steps are supported by a wall on one side and by a stringer beam on the other side.

The effective width required for load distribution is typically considered as the sum of the rise and the tread. This is because the load is distributed over both the vertical (rise) and horizontal (tread) components of each step. Therefore, the width of the beam-like steps is R+T. Hence, the correct answer is: R+T