Study on Simplified Calculation of First-order Longitudinal Vibration Period for Fixed Hinge Cable-stayed Bridges
The simplified calculation of the first-order longitudinal vibration period for a cable-stayed bridge is very important for the comparison of design plans and the evaluation of seismic performance. Firstly, according to the longitudinal seismic inertia force transmission of cable-stayed bridges, the double-mass model derived by flexibility method was developed to simplify the calculation of the first-order longitudinal vibration. Based on significant coupling between the longitudinal modes and vertical modes, the simplified calculation of the first-order longitudinal vibration period was then investigated by energy principle in fixed hinge cable-stayed bridges. Finally, the two formulas were evaluated by the tests on ten built-up bridges. It is concluded that these two simplified formulas were in good agreement with those predicated by finite element method. The proposed double-mass model has higher accuracy and reliability.
Keywords: fixed hinge system, cable stayed bridges, the first-order longitudinal vibration period, double-mass model, flexibility method, energy principles
CHEN Qingjun. ZHANG Ting, CHEN Zhihai, et al. Traveling wave effect analysis of superTong-span cable-stayed bridge under long-period stochastic seismic excitation [J]. Journal of Hunan University: Natural Sciences. 2014, 41(4); 1 - 9. (In Chinese)
FAN Lichu, HU Shide, YE Aijun. Seismic design of long-span bridge [J]. Beijing; China Communication Press, 2001; 123-142. (In Chinese)
ZHAO Yueyu. ZHOU Haibing, JIN Bo, et at. Influence of bending rigidity on nonlinear natural frequency of inclined cable [J]. Engineering Mechanics, 2008, 25( 1) : 196- 202. (In Chinese)
YU Baochu, QIU Wenliang, ZHANG Zhe, et al. Theoretical study on space coupling free vibration analysis of Jinma Bridge [J]. Journal of Wuhan University of Technology: Transportation Science & Engineering, 2007,31(5) : 898 - 901. (In Chinese)
STRAUPE V, PAGEL1TIS A. Analysis of geometrical and mechanical properties of cable-stayed bridge [J]. Procedia Engineering. 2013,57(1):1086 - 1093.
ZHANG Yangyong, XIAO Rucheng. Approximate calculation of natural frequency of cable-stayed bridges with double pylons [J]. Highway Engineering, 2009,34( 1) :72 - 76. (In Chinese)
YUAN Wancheng, YAN Dong. Simplified calculational method of floating frequency for cable-stayed bridges [J]. Journal of Tongji University: Natural Science, 2005, 33 ( 11 ) : 1423 - 1427. (In Chinese)
CAMARA A, ASTIZ M A. YE A J. Fundamental mode estimation for modern cable-stayed bridges considering the tower flexibility [J]. Journal of Bridge Engineering, 2014, 19(6) :213 -226.
DAI Gonglian, SU Miao, LIU Wenshuo. et al. Stress analysis of pier-tower-girder fixed region of cable-stayed bridge with trough girder [J]. Journal of Hunan University; Natural Sciences. 2014. 41(1); 27 - 32. (In Chinese)
HUANG Xiaoguo. LI Jianzhong, GUO Lei. Appropriate constraint systems for simple-tower cable-stayed bridges under earthquake [JJ. Structural Engineers. 2008. 24 ( 6 ): 29 - 35. (In Chinese)
JTG/T B02-01-2008 Guidelines for seismic design of highway bridges[S]. Beijing: China Communications Press. 2008:28 -32
- There are currently no refbacks.