What is the term for the distance between the center of rigidity and the center of mass?

The term for the distance between the center of rigidity and the center of mass is referred to as eccentricity. In the context of structural engineering and dynamics, eccentricity plays a crucial role in understanding how structures respond to lateral forces, such as wind or seismic activity. When the center of mass and the center of rigidity are not aligned, it creates an imbalance that can lead to rotational effects or torque on the structure, potentially leading to instability.

Understanding eccentricity is essential for engineers as it helps in the design of stable structures by ensuring that the center of mass and center of rigidity are as close as possible, or by accounting for the effects of any applied forces that could result in dynamic movement. This concept is particularly important in the analysis of buildings and other structures that must withstand various loads and forces throughout their lifespan.