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首页> 外文期刊>International journal of structural stability and dynamics >GLOBAL IMPERFECTIONS AND DIMENSIONAL VARIATIONS IN COLD-FORMED STEEL MEMBERS
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GLOBAL IMPERFECTIONS AND DIMENSIONAL VARIATIONS IN COLD-FORMED STEEL MEMBERS

机译：冷弯型钢构件的全球缺陷和尺寸变化

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摘要

The objective of this paper is to provide the results from an experimental program to measure global imperfections and dimensional variations in cold-formed steel-lipped channel members. Measurements were conducted at seven different manufacturing plants in the United States. A total of 210 cross sections were measured for global imperfections. Each cross section was measured at three locations, and every 305mm (12 in.) along the length. The data is used to characterize global bow, camber, and twist. The majority of the data exhibits global imperfections well approximated by a half sine-wave. Further, global bow imperfections are shown to have a systematic bias in the direction of bow. The measured data is compared with manufacturing tolerances (e.g., L/384) and assumed imperfection sizes from column curves (e.g., L/960) as utilized in design practice in the United States. The measured imperfections served as justification for tightening manufacturing tolerances in the United States (e.g., to L/960). Dimensional variation of typical cold-formed steel members is also measured and compared with tolerances. The measured data provides much needed input for nonlinear analysis of cold-formed steel structures.
机译：本文的目的是提供实验程序的结果，以测量冷弯钢唇形通道构件的整体缺陷和尺寸变化。在美国的七个不同制造工厂进行了测量。总共测量了210个横截面的整体缺陷。在三个位置测量每个横截面，沿长度每305毫米（12英寸）测量。数据用于表征整体弯曲，外倾和扭曲。大多数数据显示出半个正弦波近似的整体缺陷。此外，整体弓形缺陷显示出在弓形方向上存在系统性偏差。将测量的数据与制造公差（例如L / 384）进行比较，并根据美国设计实践中的柱曲线（例如L / 960）假定缺陷尺寸。所测得的缺陷可作为加强美国制造公差的依据（例如，达到L / 960）。还测量了典型冷弯钢构件的尺寸变化并将其与公差进行比较。实测数据为冷弯钢结构的非线性分析提供了非常需要的输入。

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