|Table of Contents|

Failure behavior of continuous steel-concrete composite box bridge girders under fuel fire(PDF)

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

Issue:
2023年5期
Page:
40-50
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Failure behavior of continuous steel-concrete composite box bridge girders under fuel fire
Author(s):
LI Xu-yang1;  ZHANG Gang1;  YUAN Zhuo-ya2;  TANG Chen-hao1;  WAN Hao1;  LU Ze-lei1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co. Ltd., Xi'an 710075, Shaanxi, China)
Keywords:
bridge engineering;  continuous steel-concrete composite box bridge girder;  fire resilience;  numerical simulation;  failure behavior
PACS:
U448.36
DOI:
10.19721/j.cnki.1671-8879.2023.05.005
Abstract:
Amied that combined action of fuel fire and structural load can cause serious damage or even collapse of steel bridge girders in a short time, the failure behavior and fire resistance of steel bridge girders exposed to fuel fire environment were studied, the fire test of a two-span continuous steel-concrete composite box bridge girder was served as research basis. A numerical calculation model was established that can trace mechanical behavior of continuous steel-concrete composite box bridge girders under high temperatures. Under different loading positions and fire exposure positions, variations of structural deformation, support reaction and bending moment with fire exposure time were analyzed. Failure mechanism of continuous steel-concrete composite box bridge girders was investigated under different fire conditions, and relevant fire resilience improvement methods were proposed. The results show that structural deformation of continuous steel-concrete composite box bridge girders is greatly affected by the position of external load when the midspan is subjected to fire. There will be less large deformation when middle support is exposed to fire, and sharp increase of deformation exist only when it is failed. The reaction force of side supports firstly decreases sharply and then increases, while the reaction force of the middle support changes in the opposite direction. In the initial stage of fire exposure, thermal bending effect of the main girder generates a large pull-up force at the side support, thus leading to a hidden danger of support separation. The main girder undergoes a violent redistribution process of internal force during fire exposure. The negative bending moment of the middle support sharply increases in a short period of time firstly. Finally, non-fire-affected area of the main girder bears more bending moment. The middle support exposed to fire experiences more intense internal force redistribution than the middle-span exposed to fire. When the midspan is exposed to fire, the failure mode of girder is usually accompanied by large deformation in the fire-exposed span. When the middle support is subjected to fire, sudden failure of girder occurs due to continuous degradation of the bearing capacity in the negative moment zone. Pull-out supports or displacement-limit measures should be used on side supports. The local reinforcement in the compression area and the increase of diaphragms should be applied on the middle support. These measures can effectively enhance the fire resilience of continuous steel-concrete composite box bridge girders.1 tab, 11 figs, 40 refs.

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Last Update: 2023-10-10