Proposed Revisions to the Current Charpy V-Notch Requirements for Structural Steel Used in U.S. Bridges

Steven Altstadt; William Wright; Robert Connor

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Proposed Revisions to the Current Charpy V-Notch Requirements for Structural Steel Used in U.S. Bridges

机译：美国桥梁所用结构钢当前夏比V型缺口要求的拟议修订

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The purpose of the research presented in this paper is to reexamine the current Charpy V-notch (CVN) requirements for steel bridges in the United States using state-of-the-art applied fracture mechanics analysis. Proposed revisions to the current CVN requirements are introduced. It is shown that, in general, the typical fracture toughness implied by current minimum CVN requirements results in a trend of decreasing resistance to brittle fracture as the minimum specified yield strength grade increases. The results also show that fracture resistance for the current minimum CVN requirements for the three AASHTO temperature zones is inconsistent for different high-performance steel (HPS) grades. A realignment of the current CVN test temperatures and required notch energy is proposed by normalizing all grades to the crack tolerance associated with the AASHTO yield strength grade 36 ksi steel CVN requirements.

机译：本文提出的研究目的是使用最新的应用断裂力学分析来重新审查美国目前对钢桥的夏比V型缺口（CVN）的要求。介绍了对当前CVN要求的建议修订。结果表明，一般来说，当前的最低CVN要求所隐含的典型断裂韧性会导致随着最小规定屈服强度等级的提高，抗脆性断裂的能力降低。结果还表明，对于不同的高性能钢（HPS）级，三个AASHTO温度区的当前最低CVN要求的抗断裂性是不一致的。通过将所有等级标准化为与AASHTO屈服强度等级36 ksi钢CVN要求相关的抗裂性，提出了对当前CVN测试温度和所需缺口能量的重新调整。

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来源
《Journal of bridge engineering》 |2014年第1期|131-140|共10页
作者
Steven Altstadt; William Wright; Robert Connor;
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作者单位

Stress Engineering Services, Inc., 13610 Westland East Blvd., Houston, TX 77041;

Dept. of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061;

School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907;

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正文语种 eng
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关键词
Charpy V-notch; Brittle fracture; Fracture critical members; Fracture toughness; High-performance steel;

机译：夏比V型缺口;脆性断裂;骨折关键成员;断裂韧性;高性能钢;

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Proposed Revisions to the Current Charpy V-Notch Requirements for Structural Steel Used in U.S. Bridges

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