Seismic Response Analysis of a Retrofitted Concrete Building in Mexico City

2019 ◽  
Author(s):  
Ulises Ruiz Barba ◽  
Juan Murcia-Delso ◽  
Oriol Arnau ◽  
David Muria-Vila ◽  
Sergio M. Alcocer
Keyword(s):  
Reinforced Concrete ◽  
Mexico City ◽  
Analytical Model ◽  
Soft Soil ◽  
Ambient Vibration ◽  
Response Analysis ◽  
Vibration Properties ◽  
Moderate Earthquake ◽  
Ambient Vibration Testing ◽  
Concrete Building

<p>This paper presents results of an ongoing study on the seismic performance of a retrofitted concrete building located in the soft soil area of Mexico City. The original structure consisted of reinforced concrete frames in two directions. The building was repaired and retrofitted after having been damaged during a moderate earthquake in 1979. The retrofit strategy consisted mainly of installing external steel braces in one direction of the building, and reinforced concrete infill walls in the other direction. The retrofitted structure showed minor damage after the 1985 and 2017 earthquakes. The goal of this investigation is to assess the structural response of the building and the effectiveness of the retrofit strategy by combining post-earthquake damage inspections, analytical modeling and ambient vibration testing. This paper focuses on the development and calibration of a three-dimensional analytical model of the building, and on the analysis of the vibration properties of the retrofitted structure. The analytical model has been calibrated using data from ambient vibration tests conducted after the 2017 event. The study of the vibration properties of the building has shown the strong influence of soil-structure interaction in the response of this building.</p>

scholarly journals Numerical Modeling of Masonry Infilled Reinforced Concrete Building during Construction Stages Using ABAQUS Software

Buildings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 181 ◽  
Author(s):  
Boudjamaa Roudane ◽  
Süleyman Adanur ◽  
Ahmet Can Altunışık
Keyword(s):  
Reinforced Concrete ◽  
Natural Frequencies ◽  
Ambient Vibration ◽  
Mode Shapes ◽  
Analysis Model ◽  
Reinforced Concrete Building ◽  
Finite Element Software ◽  
Comparison Results ◽  
Concrete Building ◽  
Abaqus Software

The effects of seismic actions on reinforced concrete (RC) structures are strongly influenced by the dynamic behavior of their materials. It is crucial to find a simple definition of the natural frequencies of reinforced concrete buildings, particularly in relation to both principal and secondary elements constructing the reinforced concrete building type. This paper firstly presents a comparison with the ambient vibration surveys. An analysis model of different stages of construction of the reinforced concrete masonry wall was compared using the finite element software. In the second step, structural responses of the model were investigated by means of static analysis. Three main types were examined: Bare frame for one, two and three storeys; brick-walled; and coated cases. Modal analysis is carried out by ABAQUS software starting from the deformed building, to provide the natural frequencies and mode shapes. For the natural frequencies, a good agreement is obtained between analytical and experimental results. Furthermore, the comparison results between different cases show that the application of the plaster work increases the lateral stiffness and has significant effects on the dynamic response of the buildings.

The Mexico Earthquake of September 19, 1985—Performance of Low-Rise Buildings in Mexico City

1989 ◽  
Vol 5 (1) ◽  
pp. 121-143 ◽  
Author(s):  
E. Miranda ◽  
V. V. Bertero
Keyword(s):  
Reinforced Concrete ◽  
Mexico City ◽  
Soft Soil ◽  
Time History ◽  
Federal District ◽  
Excellent Performance ◽  
Soil Zone ◽  
Space Frames ◽  
Dynamic Analyses ◽  
Mexico Earthquake

This paper summarizes the results of analytical studies conducted to understand the observed performance of low-rise buildings located in the soft-soil zone of Mexico City during the 1985 Michoacan earthquake. Two low-rise reinforced concrete moment resistant space frames were designed in accordance with the 1976 Code for the Federal District of Mexico. They were subjected to a series of static and time history dynamic analyses. The results indicate that the designed buildings have significantly larger lateral strengths than required by the Code and that these overstrengths were the main reason for the excellent performance of most of the low-rise buildings in Mexico City during the 1985 Michoacan earthquake.

Probabilistic seismic response analysis of a 3-D reinforced concrete building

2013 ◽  
Vol 44 ◽  
pp. 11-27 ◽  
Author(s):  
Marco Faggella ◽  
André R. Barbosa ◽  
Joel P. Conte ◽  
Enrico Spacone ◽  
José I. Restrepo
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Reinforced Concrete Building ◽  
Concrete Building

Performance of Medium-to-High Rise Reinforced Concrete Frame Buildings with Masonry Infill in the 2015 Gorkha, Nepal, Earthquake

2017 ◽  
Vol 33 (1_suppl) ◽  
pp. 197-218 ◽  
Author(s):  
Andre R. Barbosa ◽  
Larry A. Fahnestock ◽  
Damon R. Fick ◽  
Dipendra Gautam ◽  
Rajendra Soti ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Ambient Vibration ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
High Rise ◽  
Nepal Earthquake ◽  
Ambient Vibration Testing ◽  
Frame Buildings ◽  
The Impact

Following the 25 April 2015 Mw 7.8 Gorkha, Nepal, earthquake and subsequent aftershocks, field surveys were conducted on medium-to-high rise reinforced concrete (RC) frame buildings with masonry infill located in the Kathmandu Valley. Rapid visual assessment, ambient vibration testing, and ground-based lidar (GBL) showed that these buildings suffered damage ranging from light to severe, where damage occurred in both structural and nonstructural elements, but was most prevalent in nonstructural masonry infills. Finite-element structural analyses of selected buildings corroborate field observations of only modest structural damage. The lack of severe structural damage in this relatively limited class of engineered medium-to-high rise RC infill frame buildings illustrates the impact of modern seismic design standards and stands in stark contrast to the severe damage and collapse observed in low-rise nonengineered RC infill frame buildings. Nonetheless, the nonstructural damage hindered many of these buildings from being occupied for many months following the earthquake and subsequent aftershocks.

scholarly journals Operational modal analysis of mechanical systems using transmissibility functions in the presence of harmonics

2019 ◽  
Vol 13 (3) ◽  
pp. 1-14
Author(s):  
Van Dong Do ◽  
Thien Phu Le ◽  
Alexis Beakou
Keyword(s):  
White Noise ◽  
Modal Analysis ◽  
Gaussian White Noise ◽  
Harmonic Component ◽  
Operational Modal Analysis ◽  
Ambient Vibration ◽  
Response Analysis ◽  
Vibration Testing ◽  
Engineering Structures ◽  
Ambient Vibration Testing

Ambient vibration testing is a preferred technique for heath monitoring of civil engineering structures because of several advantages such as simple equipment, low cost, continuous use and real boundary conditions. However, the excitation not controlled and not measured, is always assumed as Gaussian white noise in the processing of ambient responses called operational modal analysis. In presence of harmonics due to rotating parts of machines or equipment inside the structures, e.g., fans or air-conditioners…, the white noise assumption is not verified and the response analysis becomes difficult and it can even lead to biased results. Recently, transmissibility function has been proposed for the operational modal analysis. Known as independent of excitation nature in the neighborhood of a system's pole, the transmissibility function is thus applicable in presence of harmonics. This study proposes therefore to apply the transmissibility functions for modal identification of ambient vibration testing and investigates its performance in presence of harmonics. Numerical examples and an experimental test are used for illustration and validation. Keywords: operational modal analysis; transmissibility function; harmonic component; ambient vibration testing.

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