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首页> 外文会议>Conference on Behaviour of Steel Structures in Seismic Areas; Jun 9-12, 2003; Naples, Italy >Seismic performance of PR frames in areas of infrequent seismicity
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Seismic performance of PR frames in areas of infrequent seismicity

机译：PR框架在不经常发生地震的地区的抗震性能

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摘要

This study evaluates and compares the seismic performance of the older steel moment frames with partially restrained (PR) connections. Typical 4-, 6-, and 8-story older frames were designed based on the 1952 AISC code using the "Wind Moment Frame" method. Nonlinear time-history analyses were conducted for thirty Mid-America ground motions using a modified version of the DRAIN-2DX program. The primary performance indices used were connection rotations, interstory drift angles (ISDA), panel zone deformations, and plastic hinge rotations. The performance of these frames are evaluated in accordance with FEMA 273 and 356 criteria for the central USA, a region of large but infrequent seismic events. The results show that these frames may be susceptible to serious damage if subjected to a large earthquake (2% in 50 years) if the frames were designed for wind forces only. However, the existing structures would perform reasonably well for a moderate event (10% in 50 years).
机译：这项研究评估并比较了具有部分约束（PR）连接的较旧钢矩框架的抗震性能。典型的4层，6层和8层较旧的框架是根据1952 AISC代码使用“风矩框架”方法设计的。使用DRAIN-2DX程序的修改版，对三十种中美洲地震动进行了非线性时程分析。使用的主要性能指标是连接旋转，层间漂移角（ISDA），面板区域变形和塑料铰链旋转。这些框架的性能是根据FEMA 273和356标准（在美国中部）进行评估的，美国中部是一个较大但不经常发生地震的区域。结果表明，如果框架仅设计用于风力，则在遭受大地震（50年内为2％）时，这些框架可能会受到严重损坏。但是，对于中等程度的事件（50年内占10％），现有结构会表现良好。

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