钢结构厚板的冲击韧性研究

Impact toughness of thick steel plates

随着钢材在我国大跨度桥梁工程中广泛应用,钢材板厚也日益增加。对于厚板钢材,厚度增大使钢板的应力应变状态发生变化,中心偏析现象严重,更容易降低钢板厚度方向的韧性,且在低温环境下,这种现象表现尤为突出。而现行相关规范缺乏对厚钢板冲击试验规定。根据厚板低温冲击韧性试验数据,对钢板厚度变化对冲击韧性影响进行了探讨,并且利用Boltzmann函数对试验结果进行拟合,为钢结构厚板工程中冲击韧性取值提供参考作用。

At present,steel products are widely applied in long-span bridge engineering of our country,thickness of steel plate day-to-day increases.Increase in steel plate’s thickness causes change of its stress-strain state and serious central segregation phenomena to more easily reduce toughness in steel plate’s thickness direction,this phenomenon is particularly prominent under low-temperature environment.The current code lacks provisions for impact tests of thick steel plates.Here,according to test data of low-temperature impact toughness of thick steel plates,effects of steel plate’s thickness variation on its impact toughness were explored.Boltzmann function was used to fit test results.The study results provided a reference for choosing impact toughness value of thick steel plates in engineering.