Example 1 - Staircase Design.pdf

Q1

(a)

Discuss the principle of structural design for transverse spanning staircase. (3 marks)

(b)

Propose a suitable structural system for the staircase shown in Figure Q1(a). The columns position was fixed and no additional column is allowed. (3 marks)

(c)

Figure Q1(b) shows the longitudinal spanning staircase and its cross section. Given the following data: Going = 250 mm Riser = 175 mm Waist = 130 mm Characteristics strength of concrete = 30 N/mm2 Characteristics strength of steel = 250 N/mm2 Concrete cover = 20 mm Finishing = 1.0 kN/m2 Imposed load = 4.5 kN/m2 Assuming diameter of main reinforcement = 12 mm (i)

Sketch Three (3) possibilities of loads arrangement on the staircase. (6 marks)

(ii)

Analyse the staircase by assuming that it is subjected to maximum load (1.4Gk + 1.6Qk) for the staircase and landing. (5 marks)

(iii)

Design the main reinforcements. (5 marks)

(iv)

Check the deflection for landing. (4 marks)

(v)

Provide the detailing. (4 marks)

Figure Q1(a)

Figure Q1(b)