The elements of design and construction connected with prestressed concrete are important in planning an earthquake resistant structure. This set of guidelines leading to good earthquake resistant structures is intended to help prevent injury and loss of human life, minimize damage to property and ensure continuity of service in the event of earthquakes of anticipated intensity. When faced with the structural drawing of the earthquake resistant prestressed concrete structures, the engineer should follow an elastic analysis as outlined in Chapter 26 of Building Code requirement for Reinforced Concrete, ACI 318-63, or other governing code or regulation. In place of the permissible one-third stress increase for all structures subjected to earthquake loads a 25 percent reduction of all moments, shears and loads may generally be used with stresses thus limited to normal values. With this approach the original code intent of the one third increase in allowable stresses is retained without any complications. An ultimate strength method, as outlined in the codes, may also by used. Examination of structures which failed in the Alaskan earthquake indicates that many failures have occurred at the construction joints. Construction joints in earthquake resistant structures should be avoided if at all possible, but where they are necessary concrete should be placed continuously to the joints. The location and details of all construction joints must be determined by the structural engineer responsible for the drawing the structure. Construction joints should always be perpendicular to the line of action of the prestressing tendons. The concept of ductility and the ability of structures to absorb energy during unusually severe earthquakes is of extreme importance in planning earthquake resistant structures. Despite the size of the calculated forces, well constructed buildings have performed amazingly well during past earthquakes. This reserve of earthquake resistance has been attributed to the ductility of the building or the plastic deformation of the structural components and foundations which absorb energy from the building motion.