Week 9 Challenge

1.

Assuming height of the column as 10m.

Slope of the roof is 1 in 10 , then tan^-1(1/10)= 5.71

tan(5.71)*10 = 0.999 = approx 1m

Load calculation

Dead load

Weight of roofing sheet = 5kg/m²

Weight of purlins + tertiary members = 25 kg/m²

Total dead load = 25 + 5 = 30 kg/m2 = 0.3 KN/m2

udl on rafter = total load*bay spacing = 0.3*5 = 1.5 kN/m2

Live load

Total live load = 75 kg/m2 = 0.75 kN/m2

udl on rafter = 0.75*5 = 3.75 kN/m2

Support condition pinned

Now ,

• Open staadpro
• Create the model structure of file and open it.
• Define and assign nodes and beams as per the given data.
• Assign properties of the structure such as tappered section and beta angles for columns
• Create and design the support to the columns and internal hinge
• Add loading such as load case details as per given dead load and live load
• Add add load combination as 1DL + 1LL
• In loading we assign selfweight and member load as per given data
• Go to analysis and perform analysis
• And go to design use AISC:ASD code in options
• Add design parameters and apply on the structure
• In commands use steel takeoff and check codes apply on structure
• Check utility ratio less than 1 or not
• Do some trial error properties after we get proper section whose utility ratio is less than 1
• Check the bending moment diagram and shear force diagram and axial force diagram
• Check whether the section is passed or failed in design.

^2.

^{Given ,}

^{FIGURE 1 :}

^{Supports are fixed and pinned}

^{Width of frame - 20m}

^{Height of end column - 10m}

^{Height of mid column - 11 m}

^{Loading udl = 20 kN/m}

^{Point load = 10kN}

^{Procedure :}

^{Create frame model in staad}

^{Assign properties to beams and columns}

^{Assign the loading to section of member}

^{Run analysis}

^{check the bending moment diagram.}

^{FIGURE 2 :}

FIGURE 3 :

3.

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