Complete structure detection technology of bridgeafter fire in operation period(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年06期
- Page:
- 109-116
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Complete structure detection technology of bridgeafter fire in operation period
- Author(s):
- YANG Chaobin; WU Huayong; WU Tao
- (Shanghai Research Institute of Building Sciences Group, Shanghai 200032, China)
- Keywords:
- bridge engineering; fire disaster; detection and evaluation; operation period; structure detection
- PACS:
- -
- DOI:
- -
- Abstract:
- To detect and assess the state of bridge structures after a fire, based on traditional detection methods combined with the characteristics of fire accidents, a structure was targeted for testing and evaluation. The damage degree of bridge bearing capacity was evaluated at the first time, and the effects of judgment on driving safety were evaluated. Based on typical practical engineering cases, a systematic exposition on these topics was presented including detection methods, monitoring methods, results analysis, and management advice. Based on conventional appearance inspection methods, 3D scanning technology was used to analyze the damaged structure. Disease location and damage degree were analyzed quantitatively, sampling and analysis of the deteriorated parts of main materials (such as concrete and steel bars) were conducted. A comprehensive evaluation of bridge damage was performed in the field and laboratory. Tracking and monitoring of bridges from the perspective of structural overall attitude and the adverse effects of earlywarning fire damage on structural safety were studied, to ensure the subsequent operation safety of bridges. Based on field test data and theoretical analysis, the temperature field, material degradation degree, damage grade, and bearing capacity of the damaged bridge structure were evaluated separately, leading to general conclusions. From the perspective of maintenance and subsequent management after fire, more reasonable and targeted treatment ideas were suggested. Finally, according to the characteristics of such projects, relevant technical experience was summarized. Research has resulted in a complete set of technologies for structural inspection of bridges after fires，and the effective application of the technologies. The results show that the deterioration degree of concrete strength and reinforcement performance after fires is smaller than those of standard approaches. According to the situation, the bridges carrying capacity can be reduced and accurately evaluated. To a certain extent, the efficiency and accuracy of structural inspection and assessment after fires are improved. This is an effective complement to existing testing technology and specifications. It provides a theoretical basis for the operation and management of bridges with similar accidents. 5 tabs, 12 figs, 25 refs.
Last Update: 2018-12-18