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Mid-America Earthquake Center Seminar Series |
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Headquartered at the University of Illinois at Urbana-Champaign |
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| A National Science Foundation Earthquake Engineering Research Center |
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Mid-America Earthquake Center Seminar Series |
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Headquartered at the University of Illinois at Urbana-Champaign |
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SEISMIC ENERGY
DISSIPATION IN DEGRADING SYSTEMS THROUGH LOW-CYCLE
FATIGUE |
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Professor
Haluk Sucuoglu |
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Energy dissipation
characteristics of structural members which exhibit both
strength and stiffness degradation under imposed
displacement reversals are investigated. In the
experimental part, seventeen reinforced concrete beam
specimens were tested under constant and variable
amplitude inelastic displacement cycles. The
constant-amplitude tests were employed to determine the
low-cycle fatigue behavior of specimens where the
imposed displacement amplitude was the major variable.
A two-parameter fatigue model was developed in order to express the variation of dissipated energy with the number of displacement cycles. Then, this model was used to predict the energy dissipation of test specimens subjected to variable-amplitude displacement cycles simulating severe seismic excitations. It has been demonstrated that the energy dissipation capacity in a forthcoming displacement cycle is dependent on the energy dissipated along the completed displacement path. Moreover, it is observed that although the total energy dissipation is dependent on the length of the displacement path consisting of a number of displacement cycles at various amplitudes, it is independent from the order of cycle amplitudes. |
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Sponsored by the MAE Center Student Leadership Council |
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