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PROPOSED NEW PROVISIONS FOR FRAME STABILITY USING SECOND-ORDER ANALYSIS

机译:使用二阶分析为框架稳定性提议的新规定

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Assessment of frame stability remains one of the more challenging aspects in the design of steel buildings. The issue is complicated by the interdependence of member and frame response, which requires that system stability effects be incorporated within member-based specification design equations. In addition, permitting geometrically and materially nonlinear structural response at the nominal limit state of the structure is fundamental to achieving economical design. As such, most specifications worldwide couple some form of nonlinear analysis with design provisions to account for significant behavioral effects (Galambos et al. 1998). In the U.S., the AISC LRFD Specification (AISC 1999) requires, as a minimum, that second-order elastic analysis (or first-order analysis coupled with moment amplification) be used to compute required element strengths.
机译:框架稳定性的评估仍然是钢结构建筑设计中更具挑战性的方面之一。成员和框架响应的相互依赖性使问题变得复杂,这要求将系统稳定性效应纳入基于成员的规范设计方程式中。此外,在结构的名义极限状态下允许几何和材料上的非线性结构响应是实现经济设计的基础。因此,全球大多数规范都将某种形式的非线性分析与设计规定结合在一起,以说明重大的行为影响(Galambos等,1998)。在美国,AISC LRFD规范(AISC 1999)至少要求使用二阶弹性分析(或一阶分析与力矩放大相结合)来计算所需的元素强度。

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