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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2005  >  5(3): 47-51
Liu Ling-jia, He Shuan-hai, Zhao Xiao-xing. Effective prestress computation of existing PC simply-supported beam[J]. Journal of Traffic and Transportation Engineering, 2005, 5(3): 47-51.
Citation: Liu Ling-jia, He Shuan-hai, Zhao Xiao-xing. Effective prestress computation of existing PC simply-supported beam[J]. Journal of Traffic and Transportation Engineering, 2005, 5(3): 47-51.
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Effective prestress computation of existing PC simply-supported beam

  • Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, China

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  • Author Bio:

    Liu Ling-jia(1963-), female, senior engineer, 86-29-82334837, liulingjia2004@yahoo.com.cn

  • Received Date: 2005-02-17
  • Publish Date: 2005-09-25
    Abstract
  • In order to evaluate the permanent prestress and structure loading capability of existing prestressed concrete bridge, the longitudinal pretensioning force was enforced on the simply-supported concrete beam to gain its natural frequency and deflection by post-tensioning structure method.Based on the relation of its fundamental frequency increasing with its pretension force's increasing, a regression analysis of the data was conducted to develop an equation of its effective stiffness, the computation value and the measure value of its deflection were compared.The analysis results show that the deflection errors of T and rectangular beams are within 10%, the errors of hollow slab beam are within 15.71%, which indicates that using the tested fundamental frequency and deflection can calculate simply-supported beam's effective prestress.

     

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