f$\text{'}$c$$is $25$MPa

Location$$Bondi

Purpose$$Residential

Member$$Beam outside the building

Fire resistance period for structural adequacy $($minutes$)60$

Based on the information given in below, determine the following minimum design requirements as per AS$3600$ for a simply supported beam:

a$)$ Exposure classification.

b$)$ Minimum concrete compressive strength.

c$)$ Minimum concrete cover.

d$)$ Minimum width of the beam and the minimum spacing of longitudinal reinforcement to meet the fire resistance requirements.