ZHOU Qian, ZHOU Jian-ting, MA Hu, LI Xiao-gang, ZHANG Lan. Improved algorithm of cable force for one-time cable tensioning on steel tube arch ribs with segmental hoisting[J]. Journal of Traffic and Transportation Engineering, 2020, 20(1): 92-101. doi: 10.19818/j.cnki.1671-1637.2020.01.007
Citation: ZHOU Qian, ZHOU Jian-ting, MA Hu, LI Xiao-gang, ZHANG Lan. Improved algorithm of cable force for one-time cable tensioning on steel tube arch ribs with segmental hoisting[J]. Journal of Traffic and Transportation Engineering, 2020, 20(1): 92-101. doi: 10.19818/j.cnki.1671-1637.2020.01.007

Improved algorithm of cable force for one-time cable tensioning on steel tube arch ribs with segmental hoisting

doi: 10.19818/j.cnki.1671-1637.2020.01.007
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  • Author Bio:

    ZHOU Qian(1987-), female, doctoral student, 673413658@qq.com

    ZHOU Jian-ting(1972-), male, professor, PhD, jtzhou@cqjtu.edu.cn

  • Received Date: 2019-08-20
  • Publish Date: 2020-02-25
  • To improve the defects of low iteration efficiency, long calculation time and neglecting the influence of temperature change of common calculation methods for cable force of long-span steel tube arch ribs during the segmental hoisting, an improved algorithm considering the influence of temperature change and improving the calculation efficiency was established. Based on the knowledge of material mechanics and geometry, the theoretical relationship between the changes of arch rib displacement and temperature during the hoisting was deduced, and the theoretical relationship between the changes of cable force and temperature was deduced considering the changes of cable length and arch rib displacement caused by the temperature change. Based on the one-time cable tensioning method and the zero order optimization method in ANSYS, a calculation program of cable force was developed considering the influence of temperature change and implementing the macro-control on the automatic search in the iteration sub step. The construction control analysis of segmental hoisting for a concrete filled steel tube arch bridge with a main span of 300 m was carried out with the improved algorithm. Analysis result shows that the results of derived theoretical formula are consistent with the change rules of finite element analysis results. The maximum relative error of displacement change of arch rib is 11%, and the maximum relative error of cable force change is 18%, both can meet the engineering accuracy requirements. Comparing with the original algorithm, the iteration number reduces from 26 to 17, the iteration efficiency increases by 35%, and the maximum deviation of cable force between the calculated and measured values reduces from 276 kN to 100 kN. The maximum deviation of arch rib displacement between the theoretical and the measured values is 7 mm after loosening cables and arched, and the arched alignment is normal. The established improved algorithm can realize the one-time cable tensioning and improve the iteration efficiency and calculation accuracy. The arch rib alignment after loosening cables and arched can meet the design requirements when using the improved algorithm to control the hoisting construction of long span steel tube arch rib.

     

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