|Table of Contents|

New control method of pull-out effect during system transformation of self-anchored suspension bridge(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年6期
Page:
74-86
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
New control method of pull-out effect during system transformation of self-anchored suspension bridge
Author(s):
WANG Xiao-ming1;  LI Bo2;  REN Wen-hui2;  TAO Pei3;  ZHONG Xing-xing1;  LI Chen-xi1; WU Run-han1;  YANG Wen-jie1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. The First Engineering Co., Ltd.,China Railway No.4 Engineering Group Co., Ltd., Hefei 230041, Anhui, China; 3. Gansu Provincial Transportation Planning Survey and Design Institute Co., Ltd., Lanzhou 730000, Gansu, China)
Keywords:
bridge engineering;  self-anchored suspension bridge;  hanger tensioning;  system transformation;  pull-out effect;  accelerated bridge construction
PACS:
U448.25
DOI:
-
Abstract:
To solve the problem of structural damage and construction-period extension caused by the pull-out action on bearings during the system transformation process for self-anchored suspension bridges, a new anti-pull-out permanent bearing connection device capable of absorbing the pull-out deformation of system conversion was proposed to decouple the vertical lifting of main girder and bearing forces during the system transformation process. The device was composed of a horizontal positioning mechanism, a temporary vertical displacement accommodation mechanism, and a longitudinal displacement accommodation mechanism. A controllable displacement stroke was provided by means of the temporary vertical displacement accommodation mechanism to absorb the lifting deformation of main girder. The horizontal positioning mechanism was used to control the main girder's horizontal deviation during the closure and returning to position stage. Based on theoretical derivation, two pull-out effect characterization indexes, namely bearing pull-out displacement and pull-out force, were established. The corresponding analytical calculation formulas were derived, and the equivalent beam method and force method were applied to construct the mechanical model for the system transformation stage of a self-anchored suspension bridge. Combined with an engineering example of a single-tower self-anchored suspension bridge, the numerical simulation and comparative analysis were carried out on traditional hanger staged tensioning method, temporary counterweight method and the proposed new method. The research results show that when the hangers are tensioned once to the design lengths, the proposed method can realize complete de-shoring of the main girder. The bearing pull-out displacement and pull-out force are both 0, and the main girder's vertical deformation is borne entirely by the displacement accommodation mechanism. The risk of forces acting on bearings are effectively eliminated. Compared with the hanger staged tensioning method and temporary counterweight method, the proposed new method can shorten the system transformation construction period by about 61% and 44%, respectively, and shorten the occupation period of under-bridge spaces by about 37% and 27%, respectively. The new bearing connection device can significantly improve the safety and construction efficiency of the system transformation of self-anchored suspension bridges. It provides a new technical pathway and theoretical basis for the rapid and intelligent construction of suspension bridges.1 tab, 17 figs, 30 refs.

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Last Update: 2025-12-20