THE VELOCITY OF DISPLACEMENT

摘要

During the twentieth century, consideration in design of drift response has moved with speed from a minor serviceability criterion to a central proportioning issue. It is suggested that the time is ripe for uncoupling the drift computation from calculated and often unrealistic lateral design forces and relating it directly to a design displacement spectrum. It is also argued that the "cracked-section" concept for determining stiffness of reinforced concrete structures may be realistic for gravity loading but is not for earthquake effects.