Ambient and Forced Vibration Testing of a Reinforced Concrete Building before and after Its Seismic Retrofitting

AbstractThis paper investigates the effects of seismic retrofitting on the modal characteristics of a 6-story RC building located in Istanbul, Turkey. Ambient vibration surveys were carried out before, during, and after the retrofitting work, which took place between June and December 2010. The building was retrofitted via jacketing of columns, addition of structural walls, and construction of a mat foundation. These studies were complemented with data from forced vibration tests performed with an eccentric-mass shaker after the retrofitting work was completed. During retrofitting, partitions were demolished; as a result, the first modal frequency of the building decreased by 11%, based on the results of the ambient vibration survey. The ambient vibration survey also showed that the modal frequencies after the seismic retrofitting increased by almost 96%. During the forced vibration tests, the building was excited around its modal frequencies using an eccentric-mass shaker. It was found that the modal dam...

[1]  Adam J Crewe,et al.  Shaking table tests of 1:4 reduced‐scale models of masonry infilled reinforced concrete frame buildings , 2001 .

[2]  Rune Brincker,et al.  Modal identification of output-only systems using frequency domain decomposition , 2001 .

[3]  E. Şafak Adaptive Modeling, Identification, and Control of Dynamic Structural Systems: II. Applications , 1989 .

[4]  M. Erdik REPORT ON 1999 KOCAELI AND DÜZCE (TURKEY) EARTHQUAKES , 2001 .

[5]  E. Taciroglu,et al.  Parameter identification of framed structures using an improved finite element model‐updating method—Part I: formulation and verification , 2007 .

[6]  Erdal Şafak Identification of Linear Structures Using Discrete‐Time Filters , 1991 .

[7]  Maria Q. Feng,et al.  Long-Term Monitoring and Identification of Bridge Structural Parameters , 2009 .

[8]  John B. Mander,et al.  Seismic Energy Based Fatigue Damage Analysis of Bridge Columns: Part 1 - Evaluation of Seismic Capacity , 1994 .

[9]  Jonathan P. Stewart,et al.  LOS ANGELES INVENTORY OF NONDUCTILE CONCRETE BUILDINGS FOR ANALYSIS OF SEISMIC COLLAPSE RISK HAZARDS , 2008 .

[10]  Maria Q. Feng,et al.  Structural Reliability Estimation with Vibration-Based Identified Parameters , 2010 .

[11]  Chung Bang Yun,et al.  Identification of Linear Structural Dynamic Systems , 1982 .

[12]  Charles R. Farrar,et al.  Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review , 1996 .

[13]  P. Welch The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms , 1967 .

[14]  P. Benson Shing,et al.  Experimental Evaluation of Masonry-Infilled RC Frames , 1996 .

[15]  Gerardo M. Verderame,et al.  Analytical investigation of elastic period of infilled RC MRF buildings , 2011 .

[16]  James L. Beck,et al.  Structural identification using linear models and earthquake records , 1980 .

[17]  Clotaire Michel,et al.  Dynamic parameters of structures extracted from ambient vibration measurements : An aid for the seismic vulnerability assessment of existing buildings in moderate seismic hazard regions , 2007, 0710.1210.

[18]  Roger Ghanem,et al.  A novel approach for the structural identification and monitoring of a full-scale 17-story building based on ambient vibration measurements , 2008 .

[19]  Thomas H. Heaton,et al.  The Observed Wander of the Natural Frequencies in a Structure , 2006 .

[20]  M. Celebi Comparison of damping in buildings under low-amplitude and strong motions , 1996 .

[21]  Yu-Chi Ho,et al.  Identification of Linear Dynamic Systems , 1964, Inf. Control..

[22]  John L. Gross,et al.  Implications for Earthquake Risk Reduction in the United States From the Kocaeli, Turkey, Earthquake of August 17, 1999 | NIST , 2000 .

[23]  Roger Ghanem,et al.  Structural System Identification. II: Experimental Verification , 1995 .

[24]  Clotaire Michel,et al.  Comparison between seismic vulnerability models and experimental dynamic properties of existing buildings in France , 2010 .

[25]  John W. Wallace,et al.  Parameter identification of framed structures using an improved finite element model‐updating method—Part II: application to experimental data , 2007 .

[26]  Richard W. Longman,et al.  Identification of linear structural systems using earthquake‐induced vibration data , 1999 .

[27]  Filipe Magalhães,et al.  Damping Estimation Using Free Decays and Ambient Vibration Tests , 2010 .

[28]  Khalid M. Mosalam,et al.  Shake‐table experiment on reinforced concrete structure containing masonry infill wall , 2006 .

[29]  Yukio Tamura,et al.  Damping Evaluation Using Full-Scale Data of Buildings in Japan , 2003 .

[30]  Carlos Sousa Oliveira,et al.  Fundamental periods of vibration of RC buildings in Portugal from in-situ experimental and numerical techniques , 2010 .

[31]  B A Cunha,et al.  The atypical pneumonias: clinical diagnosis and importance , 2006, Clinical Microbiology and Infection.

[32]  Panagiotis G. Asteris,et al.  Lateral Stiffness of Brick Masonry Infilled Plane Frames , 2003 .

[33]  Erdal S¸afak,et al.  Detection and Identification of Soil-Structure Interaction in Buildings from Vibration Recordings , 1995 .

[34]  Carlos E. Ventura,et al.  Damping estimation by frequency domain decomposition , 2001 .

[35]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[36]  Davorka Herak,et al.  Continuous monitoring of dynamic parameters of the DGFSM building (Zagreb, Croatia) , 2010 .

[37]  Mehmet Metin Kose,et al.  Parameters affecting the fundamental period of RC buildings with infill walls , 2009 .

[38]  Khan Mahmud Amanat,et al.  A rationale for determining the natural period of RC building frames having infill , 2006 .

[39]  Erdal Safak,et al.  Adaptive Modeling, Identification, and control of dynamic structural Systems. I: Theory , 1989 .

[40]  Ali Kocak,et al.  Estimation of the Fundamental Vibration Period of Existing RC Buildings in Turkey Utilizing Ambient Vibration Records , 2008 .

[41]  David J. Ewins,et al.  Modal Testing: Theory, Practice, And Application , 2000 .

[42]  G. Fraraccio,et al.  Identification and Damage Detection in Structures Subjected to Base Excitation , 2008 .