|Table of Contents|

Deformation analysis of pre-stressed concrete multi-cell thin-wall variable width box girders bridge exposed to co-action of fire and load(PDF)

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

Issue:
2011年02期
Page:
42-46
Research Field:
Publishing date:
2011-04-30

Info

Title:
Deformation analysis of pre-stressed concrete multi-cell thin-wall variable width box girders bridge exposed to co-action of fire and load
Author(s):
ZHANG Gang;  HE Shuan-hai;  WANG Cui-juan
Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
bridge engineering;  thin-wall box girder;  single load ratio;  fire and load;  deformation
PACS:
U44
DOI:
-
Abstract:
Being aimed to deformation problem of pre-stressed concrete thin-walled multi-room box girders exposed to co-action of fire and load, on the basis of enthalpy conduction model and thermo-mechanics parameters, the finite element procedure was applied to analyze the deformation of three spans pre-stressed concrete thin-walled multi-room box girders exposed to co-action of fire and load, fire and load model of single span and multi span was studied, the maximum deflection of each span during prior periods and anaphase of extending-fire time was analyzed with variation of single load ratio. The studied results indicate: under condition of the whole span fire and load model of single span or multi span, the deflection of the mid span is down-warping during the fire prophase, and upward and average during the fire anaphase; the deflection of the first and third span is down-warping with extending time during the whole fire time, which it's deflection is bigger than the second span's; the deflection of the first span is bigger than the deflection of the second span's during the prior periods, the deflection of the third span during the telophase is obvious. The deflection is obvious under action of the variation width and fire load model. 2 tabs, 3 figs, 10 refs.

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Last Update: 2011-04-30