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| Precise integration for bridges subjected to moving harmonic loads |
| Revised:October 10, 2005 |
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| DOI：10.7511/jslx20064073 |
| KeyWord:bridge,moving load,harmonic load,precise integration, |
| LIN Jia-hao ZHANG Shou-yun L(U) Feng ZHANG Ya-hui |
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| Abstract: |
| Precise integration method has been widely used and proved quite effective.So far,however,the loads have been assumed to exert on fix points within each time step.That can not reflect the moving property of moving loads within each time step.For the well known Newmark method,not only such moving property can not be reflected,but also the applied forces must be regarded as constants.These assumptions have restricted the precision and efficiency of these methods in dealing with problems of moving variable loads passing through bridges,particularly for high frequency load components.In the present paper,the precise integration method is developed so that the above assumptions have both been removed.Numerical results show that the proposed method is very efficient.Typically,for high frequency moving loads,only a few percentages of computational efforts are required in comparison with that when Newmark method is used. |
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