| Step | Calculation | Result | |------|-------------|--------| | 1. Factored load | ( w_d = 1.5 \times 20 = 30 \text kN/m ) ( P_d = 1.5 \times 30 = 45 \text kN ) | — | | 2. Maximum moment | ( M_d = \fracw_d L^28 + \fracP_d L4 = \frac30 \times 6^28 + \frac45 \times 64 = 135 + 67.5 = 202.5 \text kN·m ) | — | | 3. Choose section | IS 2062 I‑250 (Ag= 12 900 mm², Iz= 2.5 × 10⁶ mm⁴) | — | | 4. Plastic moment | ( M_p = 0.66 f_y A_g Z = 0.66 \times 250 \times 12 900 \times 0.9 \approx 1 920 \text kN·m ) | (compact) | | 5. Design strength | ( \phi M_n = 0.9 \times M_p = 1 728 \text kN·m ) | — | | 6. ULS check | ( M_d = 202.5 \text kN·m \le 1 728 \text kN·m ) | | | 7. Deflection (SLS) | ( \Delta = \frac5 w L^4384 E I = \frac5 \times 20 \times 6^4384 \times 200 000 \times 2.5 × 10^6 \approx 7.5 \text mm ) | Limit L/250 = 24 mm → OK |
Preventing excessive sagging or displacement that could crack finishes or alarm occupants.
For large-span structures, standard rolled sections are insufficient. The text covers:
The text by S.K. Duggal is a comprehensive educational resource focused on the design of steel structures according to the latest Indian Standard provisions, specifically IS: 800-2007 . It serves as a primary textbook for undergraduate and postgraduate civil engineering students, as well as a reference for practicing consultants. Core Philosophy: Limit State Method limit state design of steel structures by sk duggal pdf
Keep a copy of IS 800:2007 (plain code) and SP 6(1) (steel tables) alongside Duggal. The book references tables, but having the code helps cross-verify.
Remember that you cannot fully utilize Duggal's textbook without a copy of IS 800:2007 and the Steel Tables (SP 6) . The Bureau of Indian Standards (BIS) frequently provides legal, complimentary access to standard codes for educational purposes on their official portals.
Note: While independent document-sharing sites occasionally host user-uploaded files, downloading copyrighted textbook PDFs from unauthorized sources often violates copyright regulations and risks exposing devices to malware. Choose section | IS 2062 I‑250 (A g = 12 900 mm², I z = 2
Practical design insights into gantry girders, roof trusses, and plate girders. S.K. Duggal vs. Traditional Steel Design Books
The overturning, sliding, or uplift of the structure as a whole.
Some of the key features of "Limit State Design of Steel Structures" by SK Duggal include: ULS check | ( M_d = 202
A: The 3rd edition (2019) is more extensive (995 pages vs. 860 pages) and reflects the latest codal provisions. It features a fully reorganized and restructured set of initial chapters for improved clarity, updated content on column bases and plate girders, an expanded section on roof trusses (now split into two chapters to cover tubular sections), and includes colored diagrams for better visualization.
Unlike WSM, which applies a uniform factor of safety to the material's yield strength, LSM looks at the structure’s performance at the ultimate threshold of its service life. It evaluates two primary limit states: