Dynamic Assessment of Axial Load in Tie-Rods by Means of Acoustic Measurements

Tie-rods are structural elements of crucial importance in ancient buildings to ensure structural integrity and safety, so the assessment of their effectiveness via an estimation of the axial load is of great importance. Dynamic techniques are often employed using accelerometers to measure the frequency response of the tie-rods. In this work, the frequency response of tie-rods is obtained with acoustic recording, thus introducing general-purpose microphones to potentially replace more expensive and complex sensors in this application. Two microphones were tested, one of known technical characteristics, and a second for which they were unknown. A procedure was designed to overcome the technical limitations of the latter, and two experimental campaigns were conducted to test the proposed method.

[1]  Stefano Manzoni,et al.  Estimation of axial load in tie-rods using experimental and operational modal analysis , 2017 .

[2]  A. Polyanin.  Handbook of Linear Partial Differential Equations for Engineers and Scientists , 2001 .

[3]  Nicola Cavalagli,et al.  Laser doppler and radar interferometer for contactless measurements on unaccessible tie-rods on monumental buildings: Santa Maria della Consolazione Temple in Todi , 2017 .

[4]  Luca Collini,et al.  Vibration Analysis for Monitoring of Ancient Tie-Rods , 2017 .

[5]  Ugo Tonietti,et al.  Experimental Methods for Estimating In Situ Tensile Force in Tie-Rods , 2001 .

[6]  Carlo Rainieri,et al.  Development and validation of an automated operational modal analysis algorithm for vibration-based monitoring and tensile load estimation , 2015 .

[7]  R. Garziera,et al.  A VIBRATION-BASED METHOD FOR THE EVALUATION OF AXIAL LOAD IN TIERODS: TWO MAIN CASE STUDIES , 2017 .

[8]  Anders Brandt,et al.  Noise and Vibration Analysis: Signal Analysis and Experimental Procedures , 2011 .

[9]  M. Géradin,et al.  Mechanical Vibrations: Theory and Application to Structural Dynamics , 1994 .

[10]  Matteo Mazzotti,et al.  Nondestructive characterization of tie-rods by means of dynamic testing, added masses and genetic algorithms , 2013 .

[11]  Carmelo Gentile,et al.  Deflection measurement on vibrating stay cables by non-contact microwave interferometer , 2010 .

[12]  Carmelo Gentile,et al.  Dynamic assessment of the axial force in the tie-rods of the Milan Cathedral , 2017 .

[13]  Luca Collini,et al.  Dynamical Assessment of the Work Conditions of Reinforcement Tie-Rods in Historical Masonry Structures , 2019 .

[14]  C. Modena,et al.  Axial Force Estimation in Historical Metal Tie-Rods: Methods, Influencing Parameters, and Laboratory Tests , 2019, International Journal of Architectural Heritage.

[15]  Christian Soize,et al.  Structural Acoustics and Vibration: Mechanical Models, Variational Formulations and Discretization , 1997 .

[16]  D. Dardano,et al.  Un metodo per la determinazione del tiro nelle catene mediante identificazione dinamica , 2005 .

[17]  Francisco Javier,et al.  The "parallel" and the comparative method in Jean Rondelet Traité théorique et pratique de l'art de bâtir , 2015 .

[18]  Sergio Lagomarsino,et al.  The dynamical identification of the tensile force in ancient tie-rods , 2005 .

[19]  Giovanni Rebecchi,et al.  Bending tests to estimate the axial force in tie-rods , 2012 .

[20]  Marco Amabili,et al.  Estimation of tensile force in tie-rods using a frequency-based identification method , 2010 .