Structural Health Monitoring of Torre Central By the Wave Method

Abstract eng:
This paper presents preliminary structural health monitoring analysis of Torre Central, a 9-story reinforced concrete (RC) shear wall building in Santiago de Chile, by the wave method using recorded accelerations during 51 earthquakes over a period of two years (2009-2011). The set includes the M8.8 Maule earthquake of February 27, 2010. The building was 110 km from the rupture and was lightly damaged from this earthquake. The method is based on identifying the velocity of vertically propagating waves through the structure, which is related to the structural stiffness, and monitoring its changes. In this paper, the velocity is identified by fitting a 2-layer shear beam model in the observed response by matching, in the least squares sense, pulses in impulse responses. Only the EW response is analyzed. Two types of analysis are presented. The Maule earthquake response was analyzed in moving windows of lengths 10 s, 15 s and 20 s. The results show permanent drop in wave velocity ~20%. Additionally, all 51 events were analyzed in single time windows. Plots of the identified wave velocities vs. interstory drift show decreasing wave velocity with increasing drift and permanent change of ~11% in wave velocity at small strain level (peak drift ~10-6). The changes in wave velocity are in general agreement with published results on changes in the frequencies of vibration.

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