|Table of Contents|

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

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2020年01期
Page:
92-101
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Improved algorithm of cable force for one-time cable tensioning on steel tube arch ribs with segmental hoisting
Author(s):
ZHOU Qian12 ZHOU Jian-ting1 MA Hu13 LI Xiao-gang14 ZHANG Lan1
(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. School of Urban Construction, Chongqing Energy College, Chongqing 402260, China; 3. Chongqing Rail Transit(Group)Co., Ltd., Chongqing 401120, China; 4. T. Y. Lin International Engineering Consulting(China)Co., Ltd., Chongqing 401121, China)
Keywords:
bridge engineering arch bridge segmental hoisting zero order optimization method one-time cable tensioning method cable force alignment temperature change
PACS:
U445.4
DOI:
10.19818/j.cnki.1671-1637.2020.01.007
Abstract:
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. 2 tabs, 11 figs, 31 refs.

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Last Update: 2020-03-24