Fundamental study on performance of steel bridges under fire

本研究的重点是不要求具有耐火性能的钢桥，旨在研究钢桥在火灾下的结构性能。第一年，通过人工计算，对过去破坏钢桥的实际火灾事件和汽油罐车事故引起的火灾的大小和温度进行了估计。因此，钢桥可能经受温度超过1000℃的火灾，持续时间超过1小时。第二年，通过对新开发的桥梁高性能钢进行高温拉伸试验，比较了其与传统结构钢在高温下的力学性能。

This study focuses on steel bridges that are not required to have fire resistance and aims to investigate structural performance of steel bridges exposed to fire. In the first year, information on actual fire events that damaged steel bridges in the past, and size and temperature of fire caused by a gasoline tanker truck accident was estimated by a hand calculation. As a result, steel bridges may be subjected to fire whose temperature can be over 1000℃ for more than 1 hour. In the second year, by conducting tensile coupon tests at elevated temperature on recently developed bridge high performance steels, their mechanical properties at elevated temperature were examined in comparison to conventional structural steels.