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Features of New High-Strength Steel Materials '550 N/mm~2 Class' for Building Frames

机译：新型高强度钢结构“ 550 N / mm〜2级”的特点

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摘要

JFE Steel developed a new line of high-strength steel products with a lower limit tensile strength of 550 N/mm~2 for building frames using its advanced Super-OLAC (on line accelerated cooling)accelerated cooling technology. This product series currently consists of a steel plate, "HBL385," circular steel tube, "P-385," and square steel tube, "P Column G385." These products realize high strength and excellent earthquake resistance while maintaining the weldability of the conventional steel. The results of a test of members using the square tube confirmed that the cumulative ductility factor of 30, which is required in columns, can be sufficiently secured. A rolled H-shape steel, "HBL-H385," is also under development. A design trial was carried out to investigate the qualitative advantages and problems with these products. The results showed that it is difficult to guarantee the design criteria necessary to replace the beams in all stories as story drift increases by more than 20 percent due to reduced stiffness, but replacement of columns presents no problems for practical use. A further expansion of the applicable range is possible if designs are prepared using these products from the initial stage.
机译：JFE Steel使用其先进的Super-OLAC（在线加速冷却）加速冷却技术开发了一种新的高强度钢产品线，其下极限抗拉强度为550 N / mm〜2。该产品系列当前由钢板“ HBL385”，圆形钢管“ P-385”和方形钢管“ P Column G385”组成。这些产品在保持传统钢的可焊接性的同时实现了高强度和出色的抗震性。使用方管对构件进行测试的结果证实，可以充分确保列中要求的累积延展性因子30。轧制的H型钢“ HBL-H385”也正在开发中。进行了设计试验，以研究这些产品的质量优势和问题。结果表明，由于刚度降低而使故事漂移增加了20％以上，因此难以保证更换所有故事中的横梁所必需的设计标准，但更换列对于实际使用没有问题。如果从一开始就使用这些产品进行设计，则可能会进一步扩大适用范围。

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