Q1: In a combined footing if shear stress does not exceed 5 kg/cm², the nominal stirrups provided are

ANS:B - 8 legged

it's challenging to directly determine the number of nominal stirrups provided. However, if we assume a typical design scenario where a combined footing is subjected to moderate loads and has standard dimensions, we can provide a general explanation. In typical engineering practice, the number of stirrups provided in a combined footing is often decided based on practical considerations and design codes. For moderate loads and standard dimensions, it's common to provide a relatively small number of stirrups to ensure adequate shear reinforcement while also minimizing construction costs and complexity. Providing a small number of stirrups while still meeting the shear stress requirements ensures that the footing can adequately resist shear forces without excessive reinforcement. In many cases, engineers may choose to provide 8-legged stirrups for combined footings as a reasonable compromise between structural integrity and construction practicality. However, it's essential to note that the actual number of stirrups required for a combined footing depends on the specific design calculations considering factors such as applied loads, dimensions, and concrete strength. Therefore, the number of 8-legged stirrups provided may vary based on the specific design requirements and engineering judgment. Without specific design information, it's challenging to provide a precise explanation for why 8-legged stirrups might be chosen. However, this choice aligns with common engineering practice and serves as a practical compromise between structural performance and construction considerations in many design scenarios.