|Table of Contents|

Time-dependent variation distribution of fire temperature for concrete hollow thin-walled pier affected by flame fluid(PDF)

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

Issue:
2014年01期
Page:
26-34
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Time-dependent variation distribution of fire temperature for concrete hollow thin-walled pier affected by flame fluid
Author(s):
ZHANG Gang1; 2;  HE Shuan-hai1; 2;  WANG Cui-juan3
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Key Laboratory of Old Bridge Detection and Reinforcement Technique in Traffic Industry, Chang'an University, Xi'an 710064, Shaanxi, China; 3. School of Construction Machinery, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
bridge engineering;  concrete hollow thin-walled pier;  flame fluid;  time-dependent variation distribution of fire temperature
PACS:
U441.5
DOI:
-
Abstract:
For the structure response of the coupled variation of air current in fire field and flame temperature space, considering the effect of air current speed as well as the interaction effect of flame space and structure height, the surrounding fire model in flame fluid field was created. The temperature of flame fluid field was calculated by using time increment iteration method. The comprehensive boundary control equation and the relation between convection heat exchange and air current speed were studied. The temperature distribution statuses of facing-fluid side andlateral-fluid side in fluid field were analyzed, the surrounding fire scene of concrete hollow thin-walled pier was studied, the coupled model of flame fluid field was proposed, the time-dependent variation distribution law of fire temperature for concrete hollow thin-walled pier affected by flame fluid was revealed. Analysis result indicates that when fire time is 120 min and air current speed is 3 m·s-1, the temperature near fire source is about 100 ℃ higher than that at other air current speeds, the influence of air current speed on fire source temperature is nonlinear. The distribution depth of high temperature layer(higher than 500 ℃)on facing-fire side is only 7 cm, the outer facing-fire side concrete of hollow thin-walled pier strips easily under vertical load. Temperature on facing-fluid side is much higher than temperature on lateral-fluid side, temperature on far side of fire does not change. The distribution domains of different temperatures can be changed with the variation of air current speed in steady low fluid field, and the high temperature area on facing-fire side can be enlarged. 3 tabs, 7 figs, 28 refs.

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Last Update: 2014-03-20