In the field of structural engineering, design codes are essential for ensuring the safety and stability of structures. These codes provide specific guidelines, including the maximum allowable stresses that materials can withstand. The question refers to IS: 800-1962, which is an older but significant Indian Standard code for general construction in steel.

IS: 800-1962 and Steel Design Principles

The IS: 800-1962 code was the prevailing standard for the design of steel structures in India for many years. It outlined methods for calculating loads, designing members, and, importantly, specified the permissible stresses for various types of steel and loading conditions. The concept of permissible stress is fundamental; it represents the stress value below which a material is expected to behave elastically and safely, incorporating a factor of safety against yielding or ultimate failure.

For structural elements like steel slab plates, which are often subjected to bending, the code provided specific values for permissible bending stress. These values are critical for engineers to ensure that the plates do not deform excessively or fail when subjected to design loads, such as the weight of floors, equipment, or wind forces.

Permissible Bending Stress for Steel Slab Plates

According to IS: 800-1962, for commonly used mild steel (Fe 250 grade, which was prevalent at the time), the permissible bending stress in tension or compression for structural members like beams and steel slab plates was clearly defined. This specific stress limit helps in sizing the steel elements correctly to prevent failure and ensure serviceability throughout the structure's lifespan.

The prescribed value for the permissible bending stress in steel slab plates under IS: 800-1962 was:

• The permissible bending stress for steel slab plates was specified as \(1890 \text{ kg/cm}^2\).

This value was derived considering the yield strength of the steel and applying an appropriate factor of safety, a common practice in working stress design methods. While modern codes like IS: 800-2007 use limit state design, understanding the values from older codes like IS: 800-1962 is important for historical context and specific examination questions.

Context of Permissible Stress Values

It is useful to compare this value with other typical permissible stresses under the same IS: 800-1962 code to appreciate its context:

The value of \(1890 \text{ kg/cm}^2\) for permissible bending stress was a key design parameter under the IS: 800-1962 code, specifically applicable to steel slab plates and other flexural members, ensuring safe and efficient steel construction during its time.