Chih-Peng Yu This email address is being protected from spambots. You need JavaScript enabled to view it.1, Jiunnren Lai1, Chia-Chi Cheng1 and Chih-Hung Chiang1
1Department of Construction Engineering, Chaoyang University of Technology, Taichung, Taiwan, R.O.C.
Received: November 20, 2012 Accepted: February 15, 2013 Publication Date: March 1, 2013
In this study, a direct calculation formula using frequency amplitudes for the first two modes at two or three locations is proposed to compute the effective lengths of vibration for pre-stressed members. Derivation of the proposed formulas is based on the assumption that vibration mode shapes of cables are simple sinusoidal functions. This paper describes the use of the proposed formulas to reasonably recover the designated effective lengths for simulated cable members. The proposed formulas work well with a recent developed scheme for assessing cable forces in which good estimations can be obtained in a relatively more accurate yet simpler way than the traditional approach. It is concluded that such calculation is an alternative way in giving reference values for the lengths of tensioned members and especially useful when using in the determination of cable forces.
[1] Wenzel, H. and Pichler, D., Ambient Vibration Monitoring, John Wiley & Sons, London, pp 193198 (2005).
[2] Yu, C. P., Cheng, C. C. and Chiang, C. H., “Alternative determination of cable forces using flexural theory of axially loaded member,” Proceedings of Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring : Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011 (SPIE), San Diego, CA, March. (2011).
[3] Yu, C.-P. and Chiang, C.-H., “Prediction of dispersion relation for elastic stress waves in prestressed tendons using 1-d member theories,” IJASE journal, Vol. 1(1), 116 (2003).
[4] Wu, W.-H., Chen, C.-C., Liu, C.-Y. and Lai, G.-L., “Determination of stay cable force based on multiple vibration measurements to consider the effects of uncertain boundary constraints,” Proc. 5th European Workshop on Structural Health Monitoring, Sorrento, Italy, Paper No. B-45 (2010).
[5] Chen, C.-C., Wu, W.-H., Tseng, H.-Z. and Chen, T.-H., “Identification of dynamic parameters of stay cables using commercial camcorder,” Proc. 5th European Workshop on Structural Health Monitoring, Sorrento, Italy, Paper No. G1 (2010).
[6] Cheng, C. C., Hsu, K.T. and Yu, C. P., “Evaluation of the dynamic characteristics of an extradosed bridge using Microwave Interferometer,” Proceedings of 2nd Symposium on Life-Cycle Civil Engineering (IALCCE2010), Taiwan, Oct. (2010).
[7] Yu, C. P. and Cheng, C. C., “Dynamic analysis of a cable-stayed bridge using continuous formulation of 1-D linear member,” Earthquakes and Structures, Vol. 3, No. 34, pp 271295 (2012).
We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.
