Microseismicity Induced Structural Health Deterioration: The Case of Koyna Seismic Region, India

Abstract eng:
We present a novel technique to take advantage of the advance of instrumental seismology in collecting continuous ground motion recordings and replace the probabilistic ground motion estimates in determining the fatigue based damage to a structure or its elements due to small earthquakes. We apply our rainflow cycle counting to convert the earthquake acceleration time series into equivalent pulses of ground acceleration which could be later summed in a scalar way. We then use the Miner (1945) law of cumulative fatigue damage to estimate the damage to a reference structure. C=∑^k_i=1 ni/Ni We apply our technique to three sites at Koyna Warna seismic zone (Gupta et. al., 1972) for eight earthquakes occurring in a period of two months. We estimate that a weak element loses a life equivalent to a fatigue index of 3.2% in two months whereas a strong element loses 0.05% in the same period.

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