A client in Aberdeen plans to utilise an open area of 50m by 70m to construct a multi-storey building for his business development with a service area of 17,500m2. The distance between any two columns is requested to be from 5.0m and 8.0m. The height of each storey is 3.5m. The characteristic variable action on the building floor and the roof qk =2.0 (kN/m2) and 0.75(kN/m2), respectively. It is assumed that designs of stair and foundation have been excluded in your design.
The client would like you to provide two solutions for this new building with the same structural grid for comparison. One is steel-concrete composite floor which is supported by composite beam and steel column. Another is in-situ-casting concrete floor supported by concrete beam and column.
All the steel beams and steel columns are in S275 and UKB and UKC sections, respectively. Steel deck sheet for steel-concrete composite floor adopts the ComFlor from Tata Steel. The materials and further design information of the reinforced concrete slab, beam and column follow below:
• Concrete grade 35 (fck=35 N/mm2)
• Maximum aggregate size =20 mm
• Main steel reinforcement - high yield steel (fyk=500 N/mm2)
• Transverse links - high yield steel (fwyk=500 N/mm2)
• Diameter of main longitudinal steel (ds) = 25mm
• Diameter of transverse link (dl) = 10mm
• Design tensile strength (fctm) = 3.5 N/mm2
• Assume 15% moment redistribution (i.e. d = 0.85).
• Architectural requirements limit the maximum overall beam depth to 800mm
• Concrete cover to the main reinforcement (XO, XC1) = 25mm
• Unit weight of concrete = 25 kN/m3
As a structural engineer, you have been asked to carry out the structural analysis, design and detailing of this multi-storey building with the main tasks listed below:
Q1. Introduction to the problem, conceptual design of the structures and estimation of member sizes for two solutions, respectively.
Q2. Carry out load calculations, including wind load, and perform stability design of your two solutions.
Q3. Carry out structural analysis using LUSAS software to determine the effects of actions on one typical frame consisting of beams and columns
Q4. Perform manual analysis to verify the above LUSAS results.
Q5. Design continuous concrete beam.
Q6. Design concrete column
Q7. Design steel-concrete composite slab
Q8. Design steel-concrete composite beam.
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