2012, Volume 14, Issue 5
Strategic Study of CAE >> 2012, Volume 14, Issue 5
The study of forced vibration for threetower suspension bridge under moving loads
1. Jiangsu Provincial Yangtze River Highway Bridge Construction Commanding Department, Taizhou, Jiangsu 225321, China;
2. College of Civil Engineering, Southeast University, Nanjing 210096, China
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Abstract
Taking Taizhou Bridge for example, dynamic characteristics of the finite element model are analyzed and then the effects of different moving speeds and loads on dynamic response of three-tower twospan suspension bridge are studied. The result demonstrates that vertical bending of natural frequency is approximately 0.08 Hz, which is far below natural frequency loading truck, and will not form resonance condition. The response of force and displacement of three-tower twospan continuous suspension bridge under simply moving loads and equivalent static loads are the same. The structural will be greater when moving loads quantity and speed become greater and they have similar positive relationship. However, the load amplification factor of structural force and displacement does not vary with the quantity change of moving loads.
Keywords
dynamic characteristics ; forced vibration ; response ; load amplification factor
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