Numerical on Design of Double Angle Strut 2 - Design of Compression Members and Column Bases

TL;DR

Design a strut of a truss using a double angle section to carry a load of 130 kilo newton, following specific steps and calculations.

Transcript

hello everyone in this video we are going to see another numerical on design of double angle start so let's see first the problem statement see the problem statement is design a strut of a truss using double angle section of steel to carry a factored load of 130 kilo newton use minimum 50 mm leg length of isa length of member is 4.8 m16 volts of 4.... Read More

Key Insights

• 🎨 The numerical problem demonstrates a step-by-step approach to design a strut using a double angle section.
• 🎨 The design process involves assumptions, section selection, classification, slenderness ratio calculation, and determination of design compressive stress and strength.
• #️⃣ The calculations require referencing the IS code, specifically page numbers and table numbers.

Questions & Answers

Q: What are the given data for the numerical on design of double angle start?

The given data includes the load (130 kilo newton), minimum leg length (50 mm), member length (4.8 m), and bolt specifications (M16 bolts with dz = 16 mm and d0 = 18 mm).

Q: How is the area required for the section calculated?

The area required is calculated by dividing the load by the assumed stress. In this case, it is calculated as 130,000 N / 66.2 N/mm^2 = 1,963.75 mm^2.

Q: How is the section classified?

The section is classified by comparing the values of b/t, d/t, and (b+d)/2t with specific criteria given in Table 2 on page 18 of the IS code. Based on these values, the section is identified as semi-compact.

Q: What is the formula for slenderness ratio?

The slenderness ratio (lambda) is calculated using the formula: lambda = (0.85 * L) / Rmin, where L is the member length and Rmin is the minimum radius of gyration for the chosen section.

Q: How is the design compressive stress determined?

The design compressive stress (fcd) is obtained from the IS code by interpolating the assumed value of lambda (or fcd) between the given values in Table 9c.

Q: How is the design compressive strength calculated?

The design compressive strength (pd) is calculated by multiplying the section's area (obtained from the steel table) by the design compressive stress (fcd).

Summary & Key Takeaways

• The video provides a step-by-step guide on how to design a strut using a double angle section for a specific load.

• The given data includes the load, required leg length, member length, and bolt specifications.

• Steps involved in the design process include assuming a lambda (or fcd) value, trying different sections, classifying the section, calculating the slenderness ratio, and determining the design compressive stress and strength.