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

Yıl 2024, Cilt: 35 Sayı: 1, 23 - 40, 01.01.2024

Fuat Aras

https://doi.org/10.18400/tjce.1223515

Cited By: 1

Öz

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.

Anahtar Kelimeler

pedestrian bridge, dynamic response, field test, human-induced vibrations, human-induced vibrations, temperature effect

Kaynakça

• Ni, Y. Q., Hua, X. G., Fan, K. Q., and Ko, J. M. (2005). “Correlating modal properties with temperature using long-term monitoring data and support vector machine technique.” Engineering Structures 27, 1762–1773.
• Catbas, F. N., Susoy, M., and Frangopol, D. M., (2008). “Structural health monitoring and reliability estimation: long span truss bridge application with environmental monitoring data.” Engineering Structures. 30(9), 2347–59.
• Mosavi, A. A., Seracino, R., and Rizkalla, S. (2012). “Effects of temperature on daily modal variability of a steel-concrete composite bridge.” Journal of Bridge Engineering 17(6). doi.org/10.1061/(ASCE)BE.1943-5592.0000372
• Ni, Y. C., Alamdari, M. M., Ye, X. W., and Zhang, F. L. (2021). “Fast operational modal analysis of a single-tower cable-stayed bridge by a Bayesian method,” Measurement 174: 109048.
• Sohn, H., Dzwonczyk, M., Straser, E. G., Kiremidjian, A. S., Law, K. H., and Meng, T. (1999). “An experimental study of temperature effect on modal parameters of the Alamos Canyon Bridge.” Earthquake Engineering and Structural Dynamics 28(8), 879–97.
• Peeters, B., and De Roeck, G. (2001a). “One-year monitoring of the Z24-Bridge: environmental effects versus damage events.” Earthquake Engineering and Structural Dynamics, 30(2), 149–71.
• Ni, Y. Q., Zhou, H. F., and Ko, J. M. (2009). “Generalization Capability of Neural Network Models for Temperature-Frequency Correlation Using Monitoring data.” Journal of structural engineering 135(10), doi.org/10.1061/(ASCE)ST.1943-541X.0000050
• Tubino, F., Carassale, L., and Piccardo, G. (2016). “Human-induced vibrations on two lively footbridges in Milan,” Journal of bridge engineering, 21(8), C4015002
• Ni, Y. C., Zhang, F. L., and Lam, H. F. (2016). “Series of Full-Scale Field Vibration Tests and Bayesian Modal Identification of a Pedestrian Bridge. 21(8), C4016002. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000857
• Moutinho, C., Pereira, S., and Cunha, A. (2020). “Continuous dynamic monitoring of human-induced vibrations at the Luiz I Bridge.” Journal of Bridge Engineering, 25(8), 05020006 https://doi.org/10.1061/(ASCE)BE.1943-5592.0001580
• Chen, G. W., Chen, X., and Omenzetter, P. (2020). “Modal parameter identification of a multiple-span post-tensioned concrete bridge using hybrid vibration testing data.” Engineering Structures 219, 110953, https://doi.org/10.1016/j.engstruct.2020.110953
• Aras, F. (2018). “Modal testing of an isolated overpass bridge in its construction stages. The Baltic Journal of Road and Bridge Engineering, 13(1), 67-76.
• Min, Z. H., and Sun, L. M. (2013). “Wavelet-based structural modal parameter identification.” Structural Control and Health Monitoring, 20, 121-138. https://doi.org/10.1002/stc.474
• Peeters, B., and De Roeck, G. (2001b). “Stochastic system identification for operational modal analysis: a review.” Journal of Dynamic Systems, Measurement, and Control, 123(12), 659-667. https://doi.org/10.1115/1.1410370
• B. Sevim, A. Bayraktar, A.C. Altunışık, S. Atamtürktür, F. Birinci, Finite element model calibration effects on the earthquake response of masonry arch bridges, Finite Elements in Analysis and Design 47 (2011) 621–634
• A.C. Altunışık, A. Bayraktar, B. Sevim, H. Özdemir, Experimental and analytical system identification of Eynel arch type steel highway bridge, Journal of Constructional Steel Research 67 (2011) 1912–1921.
• Michel, C., Gueguen, P., and Bard, P-Y. (2008). “Dynamic parameters of structures extracted from ambient vibration measurements: An aid for the seismic vulnerability assessment of existing buildings in moderate seismic hazard regions.” Soil Dynamics and Earthquake Engineering, 28, 593-604. https://doi.org/10.1016/j.soildyn.2007.10.002
• Oruç, B,, Sarıkaya, A., and Küçük, Y. E. (2016). “Medeniyet University pedestrian overpass detailed design calculation report”. Prepared for the Ministry of Transport, Maritime Affairs and Communications, Ankara.
• Matlab. (2012). The MathWorks, Inc., Natick, Massachusetts, United States.
• Živanović S, Pavic A and Reynolds P. (2005). “Vibration serviceability of footbridges under human-induced excitation: A literature review”. J Sound Vib 2005;279:1–74. https://doi.org/10.1016/j.jsv.2004.01.019.
• ISO 10137 (2007). “Bases for design of structures -serviceability of buildings and walkways against Vibrations, 2nd ed.”. International Organization for Standardization, Geneva, Switzerland.
• ECS. Eurocode 5, (1997). “Design of timber structures—part 2: bridges (ENV 1995- 2)”. European Committee for Standardization; 1997.
• BSI 5400 (1978) “Steel, Concrete and Composite Bridges—Part 2: Specification for Loads”. British Standards Association, London.
• Setra, Footbridges (2006). “Assessment of Vibrational Behavior of Footbridges Under Pedestrian Loading” (Technical guide), Paris; 2006.
• Dong C-Z, Baş S. and Catbas F.N. (2020) “Investigation of vibration serviceability of a footbridge using computer vision-based methods”. Engineering Structures, 224, 111224.