| 钢结构构件抗断裂分析理论与实用方法研究 |
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| 引用本文： | 王元清,武延民,石永久,江见鲸.钢结构构件抗断裂分析理论与实用方法研究[J].湖南大学学报(自然科学版),2006,33(1):11-15. |
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| 作者姓名： | 王元清 武延民 石永久 江见鲸 |
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| 作者单位： | 1. 清华大学,土木工程系,清华大学,结构工程与振动教育部重点实验室,北京,100084
2. 中冶集团,中冶京诚工程技术公司,北京,100053 |
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| 基金项目： | 国家自然科学基金资助项目(50078029)，铁道部-清华大学科技研究基金资助项目(200410) |
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| 摘 要： | 结构钢材的韧性随温度降低而下降,其破坏形态也由塑性屈服向脆性断裂转变,构件的承载力也由强度控制变为材料的韧性控制.本文以裂纹尖端张开位移(CTOD)为指标试验研究了钢结构低温断裂行为,并提出了基于CTOD指标的钢结构防脆断设计方法.研究表明,该方法以考虑裂纹扩展而提高部分的最大承载能力作为构件的承载力,引入了温度和厚度对钢材断裂韧性的影响,通过裂纹扩展量的参数使设计方法与试验结果相吻合.
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| 关 键 词： | 低温 厚度 结构钢材 脆性断裂 设计方法 |
| 文章编号： | 1000-2472（2006）01-0011-05 |
| 收稿时间： | 2005-06-14 |
| 修稿时间： | 2005-06-14 |
Research on the Theory and Design Method for the Fracture Resistance of Steel Components |
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| WANG Yuan-qing,WU Yan-min,SHI Yong-jiu,JIANG Jian-jing.Research on the Theory and Design Method for the Fracture Resistance of Steel Components[J].Journal of Hunan University(Naturnal Science),2006,33(1):11-15. |
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| Authors: | WANG Yuan-qing WU Yan-min SHI Yong-jiu JIANG Jian-jing |
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| Abstract: | The toughness of steel decreases as temperature drops,its breakage transfers from plasticity to brittleness and the loading capacity is controlled by the toughness,not the strength.This paper experimented with the fracture behavior of steel structures at low temperature with the criteria of crack tip opening displacement(CTOD),and proposed a design method for the resistance of fracture for steel structure.This method took the max loading resistance including the increase after the crack extension,considered the influences of temperature and thickness,and introduced the crack extension parameter to coincide the calculation with the experimental results.This design method could be applied in the fracture prevention design and could be used as the basis for further research. |
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| Keywords: | low temperature thickness structural steel brittle fracture design method |
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