Modal Testing of an Isolated Overpass Bridge in Its Construction Stages

Aras, Fuat

doi:10.3846/bjrbe.2018.398

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…Aras [12] determined the dynamic properties of the Istanbul Medeniyet University Pedestrian Bridge by applying operational modal analysis principles by presenting a relatively wideliterature survey on the modal testing of similar structures. The measurements had been recorded on 20 July 2017 at 34 °C ambient temperature and under 2 people/minute of human traffic.…”

Section: Variation Of the Dynamic Properties Of The Bridge In Six Yearsmentioning

confidence: 99%

“…To fill this gap in the literature, a field testing plan has been applied to the Istanbul Medeniyet University pedestrian bridge which is a pre-stressed precast isolated reinforced one. The dynamic properties of it were already investigated six years ago when it was taken under service immediately after its construction [12]. In this study, the dynamic properties of the bridge have been determined again and compared to those extracted by Aras [12] to see if they are changed for its six-year service life.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic properties of it were already investigated six years ago when it was taken under service immediately after its construction [12]. In this study, the dynamic properties of the bridge have been determined again and compared to those extracted by Aras [12] to see if they are changed for its six-year service life. A testing plan has been applied within the frame of the Structural Health Monitoring Laboratory course in the Civil Engineering Department of Istanbul Medeniyet University.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Ambient Temperature and Magnitude of the Vibration on the Dynamics of Pre-Stressed Precast Isolated Pedestrian Bridges

ARAS

2024

Turkish Journal of Civil Engineering

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The dynamic properties of structures are known as inherent properties dependent on the mass and stiffness parameters. However, recent studies showed that the temperature and the magnitude of the vibration affect them. This study aims to reveal how the ambient temperature and human-induced vibrations alter the modal characteristics of pre-stressed precast isolated pedestrian bridges. For this aim, operational modal analyses have been applied to the Istanbul Medeniyet University pedestrian bridge. Three-bay pre-stressed precast and isolated bridge has been connecting the two campuses of the university for six years and its dynamic properties were investigated during its construction. In this study, the dominant frequencies of the bridge have been determined to see if they changed or not for its service life. Secondly, the dynamic response of the longest bay of the bridge has been evaluated under different temperatures and human-induced vibrations. Through a year, twelve acceleration measurements have been gathered in a temperature range of 5 – 33 °C and representing the different levels of human-induced vibrations, some jumping actions were applied and its response was recorded. While the performed analyses proved that, the dominant frequencies are dependent on the ambient temperature, no significant correlation was obtained between the amplitude of the vibration and the dominant frequencies of the bridge. High-amplitude vibrations have been used for the vibration serviceability check of the bridge, and it is seen that it satisfies the requirements set by different codes.

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Section: Variation Of the Dynamic Properties Of The Bridge In Six Yearsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Ambient Temperature and Magnitude of the Vibration on the Dynamics of Pre-Stressed Precast Isolated Pedestrian Bridges

ARAS

2024

Turkish Journal of Civil Engineering

Self Cite

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“…A brief look, at the vast literature on the modal identification methodologies, demonstrates that the techniques can be divided into two groups as the methods developed in the time domain and the methods used in the frequency domain (Gaylard 2001;Li and Shen 2012;Ibrahim 1986;Brincker et al 2000). The method, known as Peak Picking (PP) can be shown as the easiest and one of the most frequently used method since the representation of the signals in frequency domain exhibits the dominant frequencies of the structure (Consuegra and Santos 2015;Aras 2018;Aras and Karapınar, 2021). Besides, the evaluation of the power of the signals at a specified frequency results in modal displacement forming its mode shapes such that the square root of the power at a specific frequency is proportional to the modal displacement (Inman 2013).…”

Section: Ambient Vibration Survey and Extraction Of Dynamic Propertiesmentioning

confidence: 99%

Experimental and numerical dynamic identification in an RC tower

Aras

TUFAN²

2022

rdlc

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In this study, the dynamic behavior of one of the prominent structures in Istanbul, Üsküdar Observation Tower (UOT) has been investigated. The structural system of the tower is formed by a reinforced concrete circular tube having 2.8 meters outside diameter with a 40 centimeter thickness. By referring to the ground level, it starts from -18.2 meter due to five basement stories around the tower and its height is 44 meters. Two reinforced concrete floors were partially hanged over at 36 meter and 40 meter in height. The tower has an independent structural system from the ground level but a non-structural cladding assembly connects it to an adjacent building in the complex. With the mentioned structural features, Ambient Vibration Survey (AVS) was utilized to obtain the dynamic characteristics of UOT by Peak Picking (PP) method. The obtained dynamic properties were discussed with the peculiarities of UOT. While the performed analysis revealed the ineffectiveness of the adjacent building and the underground stories in the dynamic behavior of UOT, the torsion action of the floors has been noted. A numerical model has also been constructed to obtain the dynamic characteristics of UOT by Finite Element Analysis (FEA). The model calibration required to increase the code-based modulus of elasticity of the concrete by 23% for pairing the experimental and numerical dynamic properties. The reasons of the increase and the correlation between AVS and FEA were discussed.

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“…Using the LAN XI dynamic test system proposed by Kilikevicius et al [14] analyzed the structural dynamic response of an old bridge, and acquired the main dynamic parameters of the bridge. Aras [15] performed modal tests on an overpass during the construction, and thus determined the transition of structural system. This paper probes deep into a long-span SBS-TTAB in southeastern China.…”

Section: Introductionmentioning

confidence: 99%

Calculation and Analysis of Load Test Safety Control for Through Tied-Arch Bridge with Single Bearing Surface

Li¹,

Liu²,

Li³

et al. 2020

IJSSE

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This paper attempts to evaluate the actual carrying capacity and guarantee the operation safety of Qin Bridge, Ningbo, China. Considering the structural features of the bridge, reasonable field load plans were prepared to realize load test safety control of long-span through tied-arch bridges with single bearing surface (SBS-TTABs). The internal force, stress, and deformation control under different working conditions of static load were calculated, and compared with those measured in static load tests. After that, the natural vibration, and damping features of the target bridge under impact and bumping were explored through pulsating test, barrier-free driving test, and bumping test. The results show that the maximum deflection and strain measured on the midspan section and arch rib section were both smaller than theoretical values, the calibration coefficients of deflection and strain fell in 0.60-0.88 and 0.48-0.88, respectively, indicating that the overall rigidity and strength of the bridge meet relevant code. Under the test loads, the maximum relative residual deflection and the maximum relative residual strain at each measuring point were 12.98% and 11.76%, respectively. Both were below the 20% threshold specified in JTG/T J21-2011. It shows that the bridge span has excellent elastic recovery ability. In dynamic load tests, the fundamental frequency measured by driving test agreed with that measured by bumping test, and the vibrations were smaller than the theoretical values. This means the main span has stable vibration features. Overall, the target bridge has sufficient capacity to withstand Urban-A level vehicle load, under normal use conditions, and the bridge structure belongs to the safe state.

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Modal Testing of an Isolated Overpass Bridge in Its Construction Stages

Cited by 5 publications

References 17 publications

Effects of Ambient Temperature and Magnitude of the Vibration on the Dynamics of Pre-Stressed Precast Isolated Pedestrian Bridges

Effects of Ambient Temperature and Magnitude of the Vibration on the Dynamics of Pre-Stressed Precast Isolated Pedestrian Bridges

Experimental and numerical dynamic identification in an RC tower

Calculation and Analysis of Load Test Safety Control for Through Tied-Arch Bridge with Single Bearing Surface

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