This paper is reproduced from the proceedings of a seminar on "Seismic Problems in Structural Engineering" arranged by the Departments of Civil Engineering and Extension Studies of the University of Canterbury, and held in Christchurch from May 13 
to 16, 1968. Another paper from that seminar, also published 
in this issue of the Bulletin, discusses requirements for ductility in reinforced concrete structures. The present 
paper makes a comparison of prestressed concrete with reinforced concrete, and discusses the factors to be considered 
in the design of prestressed structures for earthquake resistance.