预应力混凝土桥梁抗火研究综述

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. 4 figs, 68 refs.