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-  2018 

预应力混凝土桥梁抗火研究综述

Keywords: 桥梁工程,预应力混凝土桥梁,火灾,综述
bridge engineering
,PC bridge,fire,review

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Abstract:

为了促进中国桥梁工程抗火研究领域的全面发展,加快预应力混凝土桥梁的抗火研究,回顾了国内外桥梁火灾的典型事故以及发生特点,强调了油罐车火灾对桥梁结构威胁的严重性,总结了预应力混凝土桥梁的火灾特点,对其抗火研究存在的问题进行了梳理,包括其材料高温特性、高温爆裂现状,火灾下桥梁预应力的存在状态及其试验与测试方法,火灾全过程中预应力混凝土桥梁力学性能的数值模拟与仿真,预应力混凝土桥梁的耐火极限,火灾后预应力混凝土桥梁的损伤评估加固及桥梁抗火研究的工程应用。从性能退化机理与极限垮塌行为、复合单元的研发与计算机仿真技术、收敛点的获取、火灾试验方法与测试技术、损伤评估精准模型和抗火设计方法的提出,五大方面给出了预应力混凝土桥梁抗火研究亟待解决的问题和更新目标,以期对桥梁工程抗火方向的学术研究提供新的视角和基础资料。
To promote the comprehensive development of fire resistance in bridge engineering in China, and accelerate the research on fire resistance of prestressed??concrete bridges, some typical fire incidents of bridges occurring at home and abroad, as well as fire characteristics, were reviewed. The severity of oil tankers as threats to bridge structures was emphasized, and the characteristics of prestressed??concrete bridges exposed to fire were summarized. Thereafter, the status of research on the fire resistance of prestressed??concrete bridges was examined. This included the high??temperature properties of materials used for prestressed??concrete bridges, the spalling feature of prestressed concrete at elevated temperatures, the service status of prestress in concrete bridges under fire exposure conditions, a test and measurement method of prestressed concrete bridges exposed to fire, a numerical analysis and simulation method of the mechanics in prestressed??concrete bridges during fires, the fire resistance of prestressed??concrete bridges, damage evaluation and strengthening methods for prestressed??concrete bridges after fire, and engineering applications. Finally, problems based on five aspects were proposed that remain to be solved in fire??resistance research for prestressed??concrete bridges,such as performance degradation mechanism and ultimate collapse behavior, compound element development and computer simulation techniques, the point of convergence,testing techniques in fire tests and measurement methods, a precise model of damage evaluation, and a fire resistance design method. A new perspective and basic information for the academic research on the fire resistance of bridges are expected

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