Monitoring of a rehabilitated building in soft soil in Mexico and structural response to the September 2017 earthquakes: Part 1: structural health monitoring system

Abstract

The seismic response of an instrumented 22-story rehabilitated building is presented. The building analyzed is as part of a complex (called CCUT) with three low-rise structures and a common basement founded on soft soil that was built in 1964. Since it was under construction until date, the building tower has experienced differential settlements and tilting. To mitigate such problems, the building has been subjected to several rehabilitations over the years. During the 1985 and 2017 high-intensity earthquakes in Mexico City, the tower suffered some damage. The aim of this article is to discuss the structural health monitoring system implemented for the tower and to describe the structure’s performance since the last rehabilitation in 2009. A monitoring methodology designed and implemented as a structural warning system based on five structural health indicators, two on seismic severity and three on structural performance, to automatically process seismic records, is presented. The results of the seismic response of the CCUT tower between 2011 and 2018 indicate that the structure had suffered moderate damage. Analysis of data, corroborated by building inspection, confirmed that the structure exhibited good performance during the 19 September 2017 Puebla-Morelos earthquake. The importance of the information obtained from the structural warning system is highlighted as a promissory tool for establishing a robust decision framework for occupants’ safety.

Spatial Analysis of Vibration Frequency Distribution of Jatibarang Dam Semarang Using Raspberryshake 4D

“…The results of data processing 2 at the research point with can be seen in table 4 is also the result of the dominant frequency value (f 0 ) that has been obtained and processed using the H / V curve The results of the dominant frequency obtained based on measurements 1 and 2 on the research track based on the classification according to Kanai (1983) and Wahyudin (2019) explain that the dominant frequency value on the research track is a low value and indicates that the earthquake vulnerability in the area around the research is still safe. And the frequency value obtained at the research point is not a single value caused by ground vibrations influenced by quasi resonance from the management building around the dam and the dominant frequency around the location (Vila, 2021).…”

Determining the Dynamic Characteristics of a Multi-Story RC Building Located in Chile: A Comparison of the Results between the Nonparametric Spectral Analysis Method and the Parametric Stochastic Subspace Identification Method

“…In this procedure, a simplified mathematical model is used, and the values of the structural parameters necessary to produce an optimal correlation between the measured and calculated responses are estimated. For the latter, the theory of structural analysis and dynamics is used to model the structure and obtain its properties [21,26,30]. Within this category are methods such as the prediction error method (PEM) and stochastic subspace identification (SSI) technique for linear systems.…”

“…Currently, state-of-the-art modal analyses of already built structures indicate that there is more than one method with which the dynamic properties of buildings can be identified. These methods can be grouped into two main categories: parametric identification, which establishes a simplified mathematical model with which the measured and calculated responses can be compared, and nonparametric identification, which identifies the system by means of transformations, functions, and mathematical processes [20,21]. Some interesting works determining the dynamic response of heritage and modern structures with irregularities using system identification techniques can be consulted in the references [22][23][24][25].…”

An Innovative Sensor Integrated with GNSS and Accelerometer for Bridge Health Monitoring

“…Ponzo achieved eigenfrequencies and the equivalent viscous damping factor using an accelerometer [17] and demonstrated that force-balanced accelerometers detected the fundamental frequency of the investigated bridge, which was less than 1 Hz [18]. However, accelerometers are likely to be affected by environmental factors, such as temperature and humidity, and are sensitive to the installation location and orientation [19,20].…”