ENCE 303 · Microsyllabus · Year III / Part I
Design of Steel Structures
Design of Steel Structures Microsyllabus – ENCE 303
The Design of Steel Structures microsyllabus (ENCE 303) is a core subject for third-year civil engineering students at the Institute of Engineering (IOE), Tribhuvan University. This page provides the complete, unit-wise Design of Steel Structures ENCE 303 microsyllabus including teaching schedules, depth codes, learning objectives, references, and model questions.
The Design of Steel Structures course covers the fundamental concepts and practical methods for designing structural steel elements and systems. Topics range from connections (welded, bolted, riveted) and tension/compression members to flexure members, plate girders, and roof trusses — all based on IS-800 Limit State Design provisions.
This Design of Steel Structures microsyllabus follows the Limit State Method (LSM) as the primary design philosophy while also introducing Working Stress Method (WSM) and Ultimate Load Method. Students will gain skills in analysis, design, and drawing of structural steel components used in real-world civil engineering projects.
Teaching Schedule
Lecture · Tutorial · Practical Hours
| L (Lecture) | T (Tutorial) | P (Practical) | Total |
|---|---|---|---|
| 3 | 1 | 0 | 4 |
Examination Scheme
Theory & Practical Assessment
| Theory Assessment | Theory Final Duration (Hrs) | Theory Final Marks | Practical Assessment | Practical Final Duration | Practical Final Marks | Total Marks |
|---|---|---|---|---|---|---|
| 40 | 3 | 60 | 0 | 0 | 0 | 100 |
Depth Codes
Legend – Teaching Depth Indicators
E Explanation
M Modal
D Definition
DM Demonstration
DV Derivation
DW Drawing
P Proof
I Illustration
NUM Numerical
MT Mid Term Test
S State
ACT Activity-based
MP Mini Project
EXP Experiment
REV Review / Recap
PS Problem Solving
QA Question Answer
Q Quiz
ST Surprise Test
Design of Steel Structures – Unit-wise Microsyllabus
1
Introduction to Design of Steel Structures
4L · 1T · 0P | Week 1| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 1.1 Steel Structure: Scope, advantages, disadvantages, types | Definition of a Steel Structure; comparison with RCC and other structures; examples: buildings, towers, stadiums | D, E, I | 0.5, 0.5, 0 |
| 1.2 Structural Steel and Classification of Steel Structures | Types and grades of structural steel (IS-800 table); stress-strain relation; properties and classification of steel sections | D, E | 1, 0, 0 |
| 1.3 Design Process and Basis for Design | Steps in steel structure design; considerations; analysis and design of steel structures; concept of FEM | E | 1, 0, 0 |
| 1.4.1 Working Stress Method (WSM) | Explain WSM, its assumptions, applications (IS-800 codal provisions), and limitations | D, E | 0.5, 0.5, 0 + 1.4.2, 1.4.3 |
| 1.4.2 Limit State Design Method (LSM) | Explain LSM, types of limit states, differences; design strength and design loads per IS-800; classification of sections as per local buckling | D, E | |
| 1.4.3 Ultimate Load Method | Overview of the method | E | |
| 1.5 Prevailing Codes and Standards | Codes used in design; introduction to NBC for wind and steel | E | — |
| Evaluation: QA, Q | |||
2
Connections in Steel Structures
13L · 4T · 0P| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 2.1 Connection in Steel Structure: Importance and types | Introduction to steel connections, purpose, and classification of connections | D, E | 0.5, 0, 0 |
| 2.2 Welded Connections: Design of simple and eccentric welding | Welds and welded connections; terms; advantages/disadvantages; types (fillet, butt/groove weld); failure mechanisms; eccentric loading with numericals and real problems | D, E, DV, P, NUM, DW | 6, 2, 0 |
| 2.3 Bolted Connections: Design of simple and eccentric bolting | Bolts and bolted connections; advantages/disadvantages; specifications; failures; bearing type bolts; HSFG bolts and their design with numericals; bolts under eccentric loads | D, E, DV, P, NUM, DW | 6, 2, 0 |
| 2.4 Riveted Connections: Brief introduction | Introduction to rivets and riveted connections | — | 0.5, 0, 0 |
| Evaluation: QA, Q | |||
3
Tension Members
4L · 2T · 0P| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 3.1 Tension Members: Definition and types | Tension members and their types based on section and failure modes (yielding, rupture, block shear failure) | D, E | 0.5, 0, 0 |
| 3.2 Section Area of Tension Members | Calculation of gross and net areas, illustrated with examples | D, E, NUM | 0.5, 0.5, 0 |
| 3.3 Design of Tension Members (Simple and Built-up) | Design of simple and built-up tension members | D, E, DV, NUM, DW | 1, 2, 0 |
| 3.4 Design of Lug Angles and Tension Splices | Lug angle: definition, importance, types, and design specifications with example; explain tension splices | D, E, NUM, DW | 0.5, 1, 0 |
| Evaluation: QA, Q | |||
4
Flexure Members (Beams & Plate Girders)
10L · 4T · 0P| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 4.1 Steel Beams and Their Types | Steel beams: types, behavior, local buckling behavior | D, E | 3, 3, 0 |
| 4.2 Design of Simple and Built-up Beams | Design considering low and high shear, laterally unsupported beams, and floor beam systems | D, E, P, NUM, DW | |
| 4.3 Design of Continuous Beams | Concept of continuous beam; calculation of BM and SF (Theory Only) | E | 1, 0, 0 |
| 4.4 Design of Plate Girders | Definition, types, economical depth and thickness, components, importance, and requirements per IS-800 | D, E, P, NUM, DW | 1+1, 0+0.5, 0 |
| 4.4.2 Design for Bending, Shear, Deflection, and Lateral Stability | Basics of design in BM, shear, deflection, web buckling, and web crippling | D, E, DW | 1, 0, 0 |
| 4.4.3 Curtailment of Plates | Details of curtailment as per IS-800 | D, E, DW | 0.5, 0, 0 |
| 4.4.4 Design of Web and Flanged Splices | Basics of web and flange splice design and related numericals | D, E, P, NUM, DW | 2, 0, 0 |
| Evaluation: QA, Q, MP | |||
5
Compression Members (Columns & Column Bases)
10L · 4T · 0P| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 5.1 Types of Compression Members | Definition and types of compression members | D, E | 0.5, 0, 0 |
| 5.2 Buckling Behavior of Columns | Column behavior and buckling; Euler theory; slenderness ratio; effective length | D, E | 0.5, 0, 0 |
| 5.3 Design of Columns (Simple and Built-up) | Design strength of struts; design of simple and built-up columns | D, E, P, DW, NUM | 1, 0.5, 0 |
| 5.4 Design of Lateral Bracing | Types of bracings; single and double lacing; batten systems; tie plates; connection designs | D, E, P, NUM, DW | 3, 1.5, 0 |
| 5.5 Design of Eccentrically Loaded Columns | Concept and codal provisions for eccentrically loaded columns | D, E, DW | 1, 0, 0 |
| 5.6.1 Axially Loaded Column Bases | Design of axially loaded slab base; derivation of thickness | D, E, P, NUM, DW | 1, 0.5, 0 |
| 5.6.2 Eccentrically Loaded Column Bases | Concept and design; numericals on anchor bolts | D, E, P, NUM, DW | 2, 1, 0 |
| 5.7 Design of Column Splices | Concept and design of column splices (same-size and different-size column concepts) | D, E, P, NUM, DW | 0.5, 0.5, 0 |
| Evaluation: QA, Q, MP | |||
6
Design of Roof Trusses
4L · 1T · 0P| Topic / Sub-topic | Description | Depth Code | Hours (L, T, P) |
|---|---|---|---|
| 6.1 Types and Components of Roof Trusses | Types and components of trusses; terms related to roof trusses; connection between roof truss and masonry wall | D, E | 0.5, 0, 0 |
| 6.2 Loads on Roof Trusses | Dead Load (DL), Live Load (LL), and Wind Load (WL) on roofs | D, E | 0.5, 0, 0 |
| 6.3 Wind Load Calculations | Calculation of wind load as per IS-875 (Part 3) and NBC 104 | D, E, NUM | 1, 0.5, 0 |
| 6.4 Design of Roof Components | Design of I, C, and angle section purlins in pitched roofs | D, E, NUM, DW | 2, 0.5, 0 |
| Evaluation: QA, Q | |||
References
Recommended Books – Design of Steel Structures ENCE 303
- 1 Duggal, S. K. (2010). Limit state design of steel structures. Tata McGraw-Hill Education.
- 2 Ram, S. (2010). Design of steel structures. Pearson Education India.
- 3 Ramamrutham, S. (1986). Design of Steel Structures (6th ed.). Dhanpat Rai Pub Company.
- 4 Subramanian, N. (2011). Steel structures: Design and Practice. Oxford University Press, USA.
- 5 Bhavikatti, S. (2009). Design of steel structures (By Limit State Method as per IS: 800 2007). I. K. International Pvt Ltd.
- 6 Suwal, R. (2015). Design of Steel Structure (By Limit State Method) (Reprint 2017). Mark Line Publication, Kathmandu.
Model Question Paper – ENCE 303
Subject: Design of Steel Structures | Code: ENCE 303 | Note: Questions and marks are indicative only.
| Q.N. | Question | Marks | Chapter |
|---|---|---|---|
| 1. a) | An ISLC 300 @ 324.7 N/m (Fe 410 grade of steel) is to carry a factored tensile force of 900 kN. The channel section is to be welded at the site to a gusset plate 12 mm thick. Design a fillet weld, if the overlap is limited to 350 mm. | 6 | 2 |
| 1. b) | Design a connection of a bracket using M20 bolts of product grade C and property class 4.6, if a 12 mm thick bracket is connected by an angle 100×100×10 mm. The factored load of 200 kN acted at an eccentricity of 300 mm from the flange of the column. Design bolts lying in a plane perpendicular to the load. (Refer Fig. 1) | 9 | 2 |
| 2. a) | A column ISHB 350 @ 661.0 N/m carries an axial compressive factored load of 1000 kN. Design a suitable column base. The base rests on an M20 grade concrete pedestal. | 5 | 4 |
| 2. b) | Design a built-up column 10 m long to carry a factored axial compressive load of 1080 kN. The column is restrained in position but not in direction at both ends. Design the column with a connecting system as a single lacing with a bolted connection. Use two channels back to back. Assume steel of grade Fe 410, E250 C, and bolts of grade 4.6. | 10 | 4 |
| 3. a) | Write down the steps followed in the calculation of wind load as per IS-875 (Part 3). | 4 | 6 |
| 3. b) | What are the advantages of a Steel Structure? | 1 | 1 |
| 3. c) | A simply supported beam of span 6 m supports a reinforced concrete slab. The compressive flange of the beam is restrained due to its connection with the slab. The beam is subjected to a dead load of 35 kN/m and an imposed load of 30.0 kN/m. Design the beam. Assume the beam is sufficiently stiff against bearing. | 10 | 5 |
| 4. a) | A diagonal member of a roof truss carries a maximum pull of 300 kN. Design the section and its connection with a 16 mm thick gusset plate. The steel is grade Fe 410 and bolts of grade 4.6 are to be used. | 6 | 3 |
| 4. b) | Explain about the load-carrying capacity of a single angle in compression. Derive the relation for the most economical section of a plate girder. | 5 | 4 |
| 4. c) | How are the steel sections classified according to their moment resistance capacity? | 2 | 1 & 5 |
| 4. d) | Explain with figures about web-buckling and web-crippling. | 2 | 5 |
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