Ductility of prestressed concrete frames under seismic loading
Thesis DisciplineCivil Engineering
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
This thesis is concerned with the behaviour of prestressed concrete framed structures under earthquake loading.
An experimental programme investigated the performance of four full-size, precast, prestressed concrete beam-column assemblies under high intensity cyclic load, and in particular studied the energy dissipation and ductility characteristics of the members.
Theoretical methods for predicting the moment-curvature characteristics of prestressed concrete members are developed and compared with experimental results. A monotonic loading analysis is utilised to show the effect of a number of practical section variables on ductility for seismic design. A further analysis to determine moment-curvature curves for cyclic loading of a general prestressed concrete section showed good correlation with experiment, including the behaviour subsequent to crushing of the cover concrete. An idealization of the moment-curvature characteristics is also presented for use in seismic response analyses.
A study is made of the relative earthquake responses of comparable prestressed concrete and reinforced concrete single-degree-of-freedom structures. On the basis of the greater response displacements indicated for prestressed concrete structures, a small increase in the seismic load factor for ultimate strength design of prestressed concrete structures over that for reinforced concrete structures is recommended.