Dynamic response of mansory arch bridges using "IN-SITU" expedite measurements (original) (raw)
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Dynamic Characterization of a Masonry Arch Bridge
The present work addresses the identification of the most relevant dynamic parameters of a stone masonry arch bridge for validation of the numerical model used in the structural analysis. In situ dynamic tests were performed to measure the structural response under ambient vibration in order to characterize the structural dynamic behaviour. Appropriate software was adopted for signal analysis and processing based in the Peak Picking technique and in the Frequency Domain Decomposition.
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2015
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Expeditious measurements for frequency estimation on masonry arch bridges
2021
Masonry arch bridges, Frequency estimation, Eigenfrequency, Ambient vibration. Masonry arch bridges are structures that have complex behavior, despite being essentially old structures, they are still functional and constitute an important number of European bridges that require inspection and monitoring. The aim of the present study is to apply an expeditious approach of ambient vibration measurement to masonry arch bridges to define the first vertical frequency and the associated damping ratio, the main characteristic of the expeditious methods is the ease and speed of execution, thus providing technical information for preliminary inspections on the structure. The expeditious approach was applied to 28 masonry arch bridges which have distinct geometric characteristics, inserted in the road structure of the district of Bragança Portugal. The application of the Enhanced Frequency Domain Decomposition (EFDD) and Stochastic Subspace Identification (SSI) Techniques allowed the determin...
Ambient vibration recording on the Maddalena Bridge in Borgo a Mozzano (Italy): data analysis
Annals of Geophysics
This paper reports on a vibration measurements campaign performed on the medieval Maddalena Bridge, also known as the "Devil's Bridge", in Borgo a Mozzano (Italy), one of the most fascinating in Italy. This 11 th century masonry bridge, supported by four circular arcades, crosses the Serchio River for about one hundred meters. Information on the dynamic response of the structure have been obtained through a wholly nondestructive technique, by measuring the environmental vibrations affecting the structures. A monitoring system has been fitted on the external surface of the bridge in order to evaluate its dynamic response to vibrations originating in the adjacent railway and two nearby roads. The natural frequencies and mode shapes of the structure and the corresponding damping ratios have been obtained by analyzing the recorded data using different techniques of Operational Modal Analysis. Lastly, a finite-element model of the bridge has been calibrated to fit the experimental data.
Seismic assessment of masonry arch bridges
Engineering Structures, 2009
Non-linear analysis Pushover analysis Displacement-based design Performance based seismic design Seismic assessment of existing bridges Control node Energy-based pushover analysis Energy equivalent displacement a b s t r a c t In this paper, the seismic performance of existing masonry arch bridges is evaluated by using nonlinear static analysis, as suggested by several modern standards such as -1 2003, OPCM 3274 2004, and FEMA 440 2005. The use of inelastic pushover analysis and response spectrum approaches becomes more difficult when structures other than the framed ones are investigated. This paper delves into the application of this methodology to masonry arch bridges by presenting two particular case studies. The need for experimental tests in order to calibrate the materials and the dynamic properties of the bridge is highlighted, in order to correctly model the most critical regions of the structure. The choice of the control node in the pushover analysis of masonry arch bridges and its influence on seismic safety evaluation is investigated. The ensuing discussion emphasizes important results, such as the unsuitability of the typical top node of the structure for describing the bridge seismic capacity. Finally, the seismic safety of the two bridges under consideration is verified by presenting an in-depth vulnerability analysis.
Structural Integrity Analysis of Bridges Evaluated from Operational Vibrations
This paper presents the methodology involved in the structural integrity analysis of two bridges located in Brazil, from the excitations of operation (traffic, wind). The main objective of this paper is to evaluate the structural integrity in terms of load tests by numerical models, calibrated from the experimental parameters. The first bridge was built in 1983, whereas the second was built fourteen years later. For the measurement of vibrations in each structure it was considered the natural actions as an excitation source, without interruption of the traffic and without the use of impact equipment. Thus, a tri-axial accelerometer with high sensitivity was positioned at various points on both bridges to capture the natural frequencies of each mode of vibration. The spectra obtained were processed by algorithm that provided the first natural frequencies and their structural damping. Then, the numerical models were made in the structural analysis software followed by the calibration ...
Linear Dynamic Analysis of a Masonry Arch Bridge
Historical masonry arch bridges are one of the most important part of transportation, commercial and architecture since the ancient times. These structures must transfer to next generation, but historical bridges can be damaged by unexpected events, such as earthquakes, floods and other major natural disasters. Because of these reasons seismic response of historical bridges must be known. In this study, it is aimed to investigate dynamic linear analysis of a masonry arch bridge. For this purpose, historical Musapalas masonry arch bridge is selected as a case study. Three dimensional model of the masonry arch bridge is generated by ANSYS software with macro modelling approach. 1992 Erzincan earthquake acceleration records are considered for dynamic analysis of the bridge. As a result of the analysis, dynamic response of the bridge such as displacements and maximum-minimum principal stresses are obtained and seismic response of the bridge is examined.
Nonlinear Dynamics, 2011
Historic masonry arch bridges are vital components of transportation systems in many countries worldwide, ensuring the ready access of goods and services to millions of people. The structural failure of these historic structures would severely and adversely impact the economies of these nations due to the massive disruptions of transportation systems accompanying such failures. To successfully maintain these aging masonry structures, performance assessment must incorporate the unique mechanical characteristics of masonry. Therefore, the preferred analysis technique must go beyond a linear approach. This study assesses the earthquake performance of a restored historical masonry arch bridge through nonlinear finite element analysis incorporating the Drucker–Prager damage criterion. The case study structure is the Mikron Arch Bridge, a nineteenth century Ottoman Era structure built over the Firtina River near Rize, Turkey, and restored in 1998. The Mikron Arch Bridge was first subjected to ambient vibration testing, during which accelerometers were placed at several points on the bridge span to record the bridge vibratory response. The investigators then used Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification techniques to extract the experimental natural frequencies, mode shapes, and damping ratios from these measurements. Experimental results were compared with those obtained by the linear finite element analysis of the bridge. Good agreement between mode shapes was observed during this comparison, though natural frequencies disagree by 8–10%. The boundary conditions of the linear finite element model of Mikron Arch Bridge are adjusted such that the analytical predictions agree with the ambient vibration test results. By introducing the Drucker–Prager damage criterion, the calibrated linear FE model was next extended into a nonlinear model. Nonlinear analysis of seismic behavior of Mikron arch bridge was performed considering the acceleration record of Erzincan earthquake in 1992 that occurred near the Mikron Bridge region. The displacement and stress results were observed to be allowable level of the stone material. Moreover, linear FE model calibrations elicited a significant influence on the nonlinear FE model simulations.
Dynamic Characteristics of a Bridge Using Ambient Vibration Measurements and Finite Element Analysis
2014
This paper describes dynamics characteristics of a girder steel bridge based on ambient vibration measurements and finite element method of analysis. The bridge, known as Asuka Oohashi was constructed in 1979 and spans 256 m over the river Koyoshi located at Yurihonjo city, Akita Prefecture, Japan. In this research, the target bridge is investigated by means of micro vibration measurements and Fourier analysis to obtain its dynamic characteristics in especial predominant frequencies and their modes of vibration. In addition Finite element model was constructed and analytical results are compared with those result obtained from measurements. Analysis permits to identify modes of vibration of the bridge and also permits to validate measurement results. Combination of in-situ measurements and analysis permits also to construct a reliable analytical model which can be used for dynamic analysis using real earthquake record as input motion