IS-800:2007 |Steel Structure| Important key points for Every Civil Engineer ||By- Akash Pandey||

#Akashpandey #uniquecivil

IS-800:2007 Introduction:-
1. IS:800 was based on allowable stress design methodology.
2. The methodology of design of steel structures has undergone major changes during the last two decades due to research all over the world.
3. Revision of many other steel-related codes in India is also dependent on the revision of IS:800.
4. Revision of IS:800 was essential to include design stipulation as is prevalent all over the world and to ensure the availability of efficient sections.

Material:-
All the structural steel used in general construction is mild steel and high tensile structural steel The fabrication of steel is coming under the purview of this shall before fabrication conforms to Is 2062.

Properties:-
1. Unit mass of steel – 7850 kg/m^3
2. Modulus of elasticity (E) - 2 x 〖10〗^5 N/mm^2
3. Poisson ratio (μ) – 0.3
4. Modulus of rigidity (G) – 0.769 x 10^5 N/mm^2 (MPa)
5. Coefficient of thermal expansion (α_𝑡) - 12 x 10^(−6) / Celsius

Welded Connection Types:- Bolted Connection Types:-
1. Butt Weld 1. Unfinished or Black bolt
2. Fillet Weld 2. Finished or Turned Bolt
3. High strength Bolt
Design Philosophy:-
A. Working Stress Method (WSM)
Allowable or Permissible stress = (Yield Stress)/(Factor of safety)

B. Ultimate Load Design (ULD)
(Working Load + Load Factor) less than or equal to Ultimate load

C. Limit State Method (LSM)
1. Limit state of Strength
2. Limit state of Serviceability
3. Limit state of collapse

Limit State Method:-
a. Limit state of strength
1. Loss of stability of structure including foundation and supports.
2. Loss of equilibrium of the structure as a whole or in parts.
3. Failure by excessive deformation, yielding.
4. Fracture due to fatigue.

b. Limit state of Serviceability -
1. Deformation and deflection.
2. Vibration in the structure.
3. Repairable damage due to fatigue (include oscillation).
4. Corrosion and durability.
5. Ponding of structures.
6. Fire-resistant.

Difference Between WSM And LSM
A. Working Stress Method=
1. It is based on elastic theory. Concrete and steel are assumed to act together elastically and follow Hook’s law.
2. The stresses in the structural members are considered for normal working loads
without considering the condition existing at the time of failure.
3. Design criteria
load-carrying capacity is greater than the working load

B. Limit state Method
1. It takes into account actual nonlinear elastoplastic stress-strain behavior of concrete and steel.
2. The design is based on ultimate loads at failure. Different partial safety factors are used to limit state collapse and serviceability under different load combinations.
3. Design Criteria
( Load carrying capacity of material / partial safety factor for material ) is greater then Load combination £(load x corresponding partial safety factor for the load)

Effective Slenderness Ratio
The ratio of the effective length of the member to the radius of gyration of the c/s about the axis under consideration.

Shear Lag effect:- In-plane shear deformation effect by which concentrated forces tangential to the surface of the plate gets distributed over the entire section perpendicular to the load over a finite length of the plate along the direction of load.

Buckling Load:- The load at which an element a member or a structure as a whole, either collapses in service or buckles in load test and develops excessive lateral deformation or instability.

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