Impact of load combinations on structural reliability determined from testing cold-formed steel components
Impact of load combinations on structural reliability determined from testing cold-formed steel components
复制标题
通过测试冷弯型钢构件确定荷载组合对结构可靠性的影响
DOI：
10.1016/j.strusafe.2013.10.006
复制
发表时间：
2014
影响因子：
5.8
通讯作者：
B. Schafer
中科院分区：
文献类型：
--
作者：
V. Z. Meimand;B. Schafer
本文的目的是探讨荷载组合对冷弯型钢构件可靠性评估方法的影响。AISI规范（AISI-S100-07）第F章提供了通过直接测试确定冷弯钢构件的电阻、安全系数（Ω）的方法。该程序使用标准（美国）荷载和抗力系数设计格式，但将荷载侧简化为单一荷载组合和单一恒活荷载比。这一假设对所得到的组件可靠性的影响是这项工作的重点。为了完成这项工作，建立了所有加载条件的偏倚因子和方差。此外，还假定了所有载荷的实际载荷比范围。进行参数研究，以探索负载情况和负载比的依赖性，用于确定阻力系数，特别是，前因子termC和负载方差termVQ。参数研究被简化为一个表格，提供了负载情况相关的C和VQ系数。设计实例表明，目前的方法和负载组合相关的解决方案的影响。
The objective of this paper is to explore the impact of load combinations on the method used to assess the structural reliability of cold-formed steel components determined by testing. Chapter F of the AISI Specification (AISI-S100-07) provides a means to determined the resistance,ϕor (safety,Ω) factor of cold-formed steel components by direct testing. The procedure uses the standard (United States) Load and Resistance Factor Design format, but simplifies the load side to a single load combination and single dead-to-live load ratio. The impact of this assumption on the resulting component reliability is the focus of this work. To complete the work the bias factors and variances for all loading conditions are established. In addition, a range of practical load ratios, for all loads, is assumed. Parametric studies are performed to explore load case and load ratio dependency for use in the determination of the resistance factor,ϕ; specifically, the pre-factor termCϕand the load variance termVQ. The parametric studies are simplified into a table that provides load case dependentCϕandVQfactors. Design examples demonstrating the impact of current methods and the load combination dependent solution are provided.