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Control of deflection difference between existing and new decks during bridge widening(PDF)

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

Issue:
2011年04期
Page:
58-62,76
Research Field:
Publishing date:
2011-08-20

Info

Title:
Control of deflection difference between existing and new decks during bridge widening
Author(s):
DU Jin-sheng1;  ZHAO Gang2;  ZHAO Yong-guo2;  HUI Xiao-rong1
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. CCCC First Highway Consultants Co Ltd, Xi'an 710075, Shaanxi, China
Keywords:
bridge engineering;  bridge widening;  concrete stitch;  deformation;  critical curvature
PACS:
U445.6
DOI:
-
Abstract:
To induce the deflection difference between existing and new decks in bridge widening construction under traffic load, the grillage finite element method is used to investigate the influence of four methods and their combinations on the deformation of concrete stitches. The four methods are traffic restriction, provision of temporary shear connectors between existing and new decks, provision of temporary supports under existing bridges, and segmental placement of concrete stitches. The results show that slight traffic restriction such as close of the lane adjacent to the concrete slabs is an effective way to reduce the deflection difference between existing and new decks. But if traffic restriction is solely adopted, all the lanes have to be closed 6 to 8 hours after the placement of the concrete connectors. The provision of temporary supports under existing bridges is more effective for deflection difference reduction of slabs than the provision of temporary shear connectors between existing and new decks, but it is limited by the condition of bridge field and high cost. The segmental placement of concrete stitches is also an effective method, but it may need long time. Regarding the combination of the four methods, the slight traffic restriction plus the provision of temporary shear connectors is a feasible and effective way to prevent cracking of concrete stitches. 7 tabs, 6 figs, 13 refs.

References:

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Memo

Memo:
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Last Update: 2011-08-20