Impact load is

Impact load is

• A. A steady load over the year
• B. The weight of a fixed furniture
• C. The load due to thermal expansion
• D. A moving or sudden load applied to a building in a focused or short time interval

Answer: (D)

Impact load is the effect of a moving or sudden force that is applied to a building in a short time interval, creating an impulse. Because the load arrives quickly, the structure’s inertia amplifies the effect for a brief moment, producing high peak forces and potential dynamic responses that must be accounted for in design. This distinguishes it from steady or long-term loads, such as a constant weight that acts over a year, or the weight of fixed furniture, which are static loads. Thermal expansion, while it can induce stress, arises from temperature changes and tends to produce gradual, distributed effects rather than a sharp, impulsive event.

Impact load is the effect of a moving or sudden force that is applied to a building in a short time interval, creating an impulse. Because the load arrives quickly, the structure’s inertia amplifies the effect for a brief moment, producing high peak forces and potential dynamic responses that must be accounted for in design. This distinguishes it from steady or long-term loads, such as a constant weight that acts over a year, or the weight of fixed furniture, which are static loads. Thermal expansion, while it can induce stress, arises from temperature changes and tends to produce gradual, distributed effects rather than a sharp, impulsive event.