You are part of the structural engineering design team on

Reference no: EM13371972

You are part of the structural engineering design team on the design of a new five story office building. The structural plan view is shown below in Figure A, and the building elevation is shown below if Figure B.

1899_structural engineering design.png

As part of the structural design team you are tasked to design the top floor of the structure including the roof beam and slab design and the interior columns supporting the roof loads.

The following design factors are to be considered in the design:

The roof live load is 30 psf

The concrete used in the beam and slab design has a P_e of 4000 psi
The concrete used in the column design has a f'_c of 6000 psi
The weight of the concrete used for all components is 150 pcf
The maximum depth of the combined slab and beam thicknesses cannot exceed 12 inches
The interior column should be square whose widths do not exceed 20 inches
The slab and floor system should be designed as a continuous system
The columns should be integrated into the beams on all floors and designed as fixed-fixed members
All shear reinforcement should be #4 double leg stirrups
All column ties should be #4 ties

Specific design tasks are as follows:

1) Design the roof slab as a one-way slab system.

Use the worst case design scenario to determine the reinforcing for the entire roof
Design for flexure using only flexural and transverse steel
Check your design against deflection limitations for both instantaneous and five year loading

2) Design the two repeating interior beam sections (e.g. 8:1-2 and 8:2-3) and the two repeating exterior beam sections (e.g. A:1-2 and A:2-3).

The loading should include the-roof live load, the self-weight of the slab, and the self-weight of the beam
The beam should be designed as a doubly reinforced member
Design for flexure and shear
Check your design against deflection limitations for both instantaneous and five year loading
Check the development length of all flexural and compression steel reinforcing

3) Design the two repeating interior column cross sections as tied columns.

Design the columns as concentrically loaded columns using the roof live load, the self-weight of the slab, and the self-weight of the beams and the loading.
Design the axial reinforcement
Design the necessary tie spacing

4) Produce drawings necessary to convey all designs.

Include member cross sections, plan views, and any other drawings necessary
Include dimensions of members
Call out all reinforcement sizes and spacing

5) Produce design calculations of all work.

Calculations do not need to be typed, but should be adequately labeled showing what is being designed, and should be neatly written in a logical progression
All design loads should be shown
All equations used must be cited
Use of Excel is permitted, but hand calculations should be shown to verify Excel design

Reference no: EM13371972

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