a$.$ Using drawings, show the difference $($advantages and disadvantages$)$ between the waffle slab system and precast and composite floor systems, give examples for using different systems, and how we can know which system is the most suitable for our building. b$.$ If you have a UC $356*406*677$ column, find the design buckling resistances $[$in kN$]$ of strong and weak axis according to Eurocode $($from Table $3\mathrm{.}2)$ for the following lengths. $(3,4$and $6$ meters$)$ c$.$ Define the following definitions: Time Period T Response Spectrum Fa and Fv factors Seismic hazard Z factor Occupancy importance Ie Probability exceedance. Ductility of buildings. Cruciform column section High strength steel Composite slab section d$.$ Design a square tied column with bars into two faces, to support the following service loads: Assume: F $*$ c$\text{'}=4$ksi; Fy $=60$ksi Assume: bar diameter $=25$mm Assume any missing data