Fundamental study on performance of steel bridges under fire

本研究以无耐火要求的钢桥为研究对象，研究钢桥在火灾作用下的结构性能。第一年，通过手工计算，估计了过去损坏钢桥的实际火灾事件的信息，以及由汽油罐车事故引起的火灾的大小和温度。因此，钢桥可能会受到火灾的影响，火灾的温度可以超过1000℃，持续1小时以上。第二年，通过对新开发的桥梁高性能钢进行高温拉伸试件试验，考察了它们的高温力学性能，并与传统结构钢进行了比较。

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.