Steel Structure DESIGN24.04.2023 (1).pptx

scsasc

1. CIVIL ENGINEERING DIVISION RANCHI DEPARTMENTAL KNOWLEDGE SHARING

2. CIVIL ENGINEERING DIVISION IS THE CORE STRENGTH OF MECON

3. Outline: -Understand the requirement of assignment. -Model, analyze and design the members to fulfill assignment requirements. -Generate the General Arrangement of members (Analogues to CIVIL GA ). -Design connections, purlins, runners, louvers, etc. -Generate the Fabrication Drawings against the GA (Analogues to CIVIL reinforcement Drawing).

4. Understanding Design requirement and Modelling.

5. Assignment: -Approx. 22.5 m height -Plan area 7.5x7.0 -Two working floors -Head and Tail pulleys

6. Understanding the Requirement of assignment and modeling: The floor members arrangement should be such that all the facilities can be supported over the members. Generally we keep a maximum gap of 1.2 meter between two floor beam members in order to restrict the deflection of 6mm(generally used in floor) chq . plates (If chq. Plate is utilized as a replacement to RCC slab for floors). The members modelled are typically Bracings, Beams and columns while purlins, runners are not. Depending upon type of end connection the beam ends are released or restrained in required degree of freedom. Members Properties: Once modelling is complete we need to assign members either from pre-existing library comprising of most of the standard rolled section from Indian Standards, Jindals , Tata, etc or we can define our own built-up section depending upon the requirement . IS808 is code which shows many of the standard available sections. Support assignment: Supports are assigned based on whether end connections are to be design as fixed or pinned.

7. Floor modeling:

8. Floor modeling:

9. Elevations:

10. Loads: 1- Dead Load: Floor Load as per IS875, Gear Boxes, Motors, Monorails, Self Weight, etc. 2- Live Load: Floor Load as per IS875. 3- Monorail Load: Capacity of Monorail. 4- Wind Load: As per IS 875. 5- Earthquake Load: As per IS 1893. 6- Conveyor Gallery Load: Loads Due to Resting Conveyor gallery. 7- Belt Tension: The tension due to running and loaded conveyor belt, etc. Load Combinations: -All the Load combination as per IS Code to fulfill limit state of design and serviceability.

11. ANALYSIS AND DESIGN

12. ANALYSIS AND DESIGN: - Slenderness check is performed for both major and minor axis considering proper effective length and radius of gyration

13. DESIGN PARAMETERS:

14. SLENDERNESS OUTPUT: For floor beam: For Column:

15. TENSION MEMBERS: Design of member to withstand Yielding of gross section – cl.6.2 Rupture of net section – cl.6.3 Block shear – cl.6.4

16. YIELDING OF GROSS SECTION

17. RUPTURE OF NET SECTION

18. BLOCK SHEAR

19. DESIGN PARAMETER:

20. TENSION OUTPUT:

21. COMPRESSION MEMBER:

22. DESIGN PARAMETER:

23. COMPRESSION OUTPUT:

24. FLEXTURAL MEMBERS:

25. LATERALLY SUPPROTED BEAMS LOW SHEAR:

26. LATERALLY SUPPROTED BEAMS HIGH SHEAR:

27. LATERALLY UNSUPPROTED BEAMS:

28. DESIGN PARAMETER:

29. BENDING OUTPUT:

30. Combined Interaction Strength – cl.9.3.1:

31. Bending and tension– cl.9.3.2.1:

32. Bending and Compression– cl.9.3.2.2:

33. Combined Strength Output:

34. Serviceability Criteria:

35. Deflection Limits:

36. DJ Parameter for deflection : Deflection length without DJ Parameter Deflection length with DJ Parameter

37. LOAD ENVELOPES AND DEFLECTION OUTPUT: Load Combination 104 to 128- Factored Load cases for Strength check Load Combination 304 to 328- Factored Load cases for Serviceability check

38. OVERALL OUTPUT: Member property and classification-

39. OVERALL OUTPUT: Member design for individual forces

40. OVERALL OUTPUT: Member combined interaction and utilization ratios

41. DESIGN OF PURLINS AND RUNNER

42. RUNNER AND LOUVER:

43. PURLINS:

44. DESIGN OF PURLINS AND RUNNERS: Loads: -Dead load of Sheet, purlin member, -Live load due to dust, -Wind load, etc Analysis: -Analysis assuming simply supported member supporting the loads above. -Sag rods are used to reduce unsupported length of design members. -Generally critical in moment. -ISMC section are used. Design: - Design of Pulins are done as per IS 800 CL 8.9, more specifically as below. Moment capacity as per IS 800 Cl 8.2 in both minor and mazor axis. Shear capacity as per IS 800 Cl 8.4 Combined strength in moment as per IS 800 Section 9

45. DETAILS OF PURLINS AND RUNNERS:

46. DESIGN OF BASE PLATE: Design Loads: Design reactions are obtained from the STAAD Pro Analysis. Details required : Size of Base plate: Generally greater than size of longitudinal member and should be sufficient enough to generated Pmax < 0.45* fck . Thickness of Base plate: As per IS 800 section 7.4 Bolt Number and size: Designed to withstand total tension load and shear, arising due to vertical load, Horizontal load and Moments. Combined shear and tension as per IS 800 CL 10.3.6, Minimum of four bolts. Projected and Threaded Lengths: Projected Length should be such that the bolts can be tight in place after placing the Grout, base plate, washer plate and some allowance for more than one nut. On the other hand threaded lengt h is required length for tighting i.e. except grout and base plate.

47. MEMBER END FORCES : Design member end forces are obtained from the STAAD Pro Analysis Report for every member group i.e. for every type of members and governing forces are tabulated for design of end connection.

48. DETAILS OF BRACING END CONNECTION:

49. DETAILS OF BEAM SHEAR END CONNECTION: Design shear force and moment due to offset of member and weld connection are considered while designing these connections.

50. DETAILS OF BEAM MOMENT END CONNECTION:

51. DETAILS OF BEAM MOMENT END CONNECTION:

52. DETAILS OF BEAM MOMENT END CONNECTION: