Question: This project entails designing a cross section at mid span of a simply - supported beam ( given span length and loads ) and preparing
This project entails designing a cross section at mid span of a simplysupported beam given span length and loads and preparing a report of your calculations, a drawing, and narrative. You will develop a spreadsheet that calculates Mu at mid span of the beam and of Mn for the cross section that you design. Below are items that need to be included in the spreadsheet. This includes checks for bending moment strength, minimum beam width, minimum area of steel, and ductility tensioncontrolled Indicate units next to each input or calculated value. When checking whether a requirement is satisfied, the spreadsheet should return OK or NG next to the checked item.
Your spreadsheet should have cells for inputting the parameters below. The instructor will give you values for the items with an asterisk when you turn in your group members' names.
Span length, L
Superimposed dead load distributed ySDI
Live load distributed wha
Superimposed dead load concentrated PSDL
Live load concentrated PLL
Concrete compressive strength, fe
Aggregate diameter
Density of reinforced concrete, for load calculations
Density of reinforced concrete for material property Eq calculations
Yield strength of bars, fx
Beam width, b
Beam height, h
Stirrup diameter, d s
Required cover to stirrup
Required cover to longitudinal steel
Required clear distance between longitudinal bars in a layer
No of steel reinforcing bars in tension
Size of tensile reinforcing bars
Diameter of tensile reinforcing bars
In your spreadsheet, include calculations for:
Selfweight of beam, per foot, wSWX
Selfweight moment at mid span, Msww
Superimposed dead load moment at mid span, MSDL
Live load moment at midspan, MLLI
Show your formula for calculating Mu including load factors used
Ultimate moment, Mu
Distance from extreme compressive fiber to centroid of tensile steel, d this shall provide adequate cover to the stirrup and longitudinal steel
Minimum beam width that will provide adequate clear distance between the longitudinal bars, b min
Check that b min is satisfied
Area of tensile reinforcement, As
Minimum area of steel requirement per ACI, Asmin
Check that As meets the minimum area of steel requirement
b
Use of C T to calculate depth of uniform compression block, a
Depth to neutral axis, c
Strain in tensile steel, e s and check for yielding
Strain in tensile steel, e s and check that section is tensioncontrolled
Phi, f
Bending moment design strength, fMa.
Check that
Modulus of elasticity of concrete, Es
Moment due to unfactored service loads, Ma
For the service moment, Ma check whether the beam is cracked
For the service moment that you calculated, determine the moment of inertia that you would use to calculate mid span deflection of the beam
Mid span deflection of the beam under service loads
Longterm deflection of the beam, assuming that the selfweight and superimposed
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