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。
Abstract
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.
关键词
钢结构厚板 /
冲击韧性 /
韧脆转变温度 /
低温
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Key words
thick steel plate /
impact toughness /
ductile-brittle transition temperature /
low temperature
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