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| Calculation Method of Foundation Ditch Enclosure Structure Considered the Erection Time of Bracings |
| LIU Cheng-yu 1，XU Dai-hong 2 |
| 1 .Fuzhou University，Fuzhou，Fujian 350108，China;2. China Railway Erju Co. Ltd，Chengdu，Sichuan 610081 China |
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Abstract Research purposes: As using the complete analysis method for beam on elastic foundation calculate the internal force as well as the displacement of the deep foundation ditch enclosure structure，the internal bracings was applied in advanced and the calculation condition was inconsistent with the actual of the construction，a method that considered the erection time of the inner bracings was proposed in this paper in order to improve the calculation accuracy.
Research conclusions: (1)As the bar-system FEM complete analysis method for beam on elastic foundation was adopted to calculate the internal force and the displacement of the foundation ditch enclosure structure，the inner bracing was defined as compression-only bar unit with initial gap，and the width of the initial gap was equal to the lateral displacement of fender piles(or enclosure wall) on the point which the inner bracings were applied at the erection time. With that the erection time of the bracings were considered in the model，which makes the internal force and displacement calculations of the enclosure structure accord the actual better.(2)Without considering the erection time of the bracings while using the complete analysis method for beam on elastic foundation，the calculated values of the lateral displacements and moments of the fender piles(or enclosure wall ) were smaller , that was not safety in practice. ( 3 ) Research findings of this paper can provide reference for the design and construction of foundation ditch enclosure structure.
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Received: 18 June 2013
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2013, Vol. 30 
