12.01: Global plastic design of stainless steel frames
12.01: Global plastic design of stainless steel frames
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12.01：不锈钢框架的全球塑料设计
DOI：
10.1002/cepa.401
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R. Chacón
中科院分区：
文献类型：
--
作者：
I. Arrayago;E. Real;E. Mirambell;R. Chacón
不锈钢结构的使用在过去十年中有所增加，因为它们的耐用性，美观性和机械性能，如延展性，相当大的应变硬化和优异的耐火性。然而，大多数研究工作只集中在单个隔离的不锈钢构件上，不锈钢框架的分析进展有限。EN1993‐1‐4没有为不确定的不锈钢结构（如框架）提供通用的塑性设计规则，尽管它们被证明具有高延展性。另一方面，缺乏对塑性设计的指导是不锈钢结构优化设计的障碍，导致设计不经济。本文对具有粗大空心截面的无摆动不锈钢框架进行了初步研究。不锈钢框架的性能研究基于数值参数研究，考虑了材料的非线性性能和不同的不锈钢类型（奥氏体和铁素体）。本文讨论了内力的再分配，并评估了基于粗截面框架整体塑性设计的现有方法，其中除了传统的塑性设计方法外，还分析了考虑力矩再分配和应变硬化效应的替代设计方法。初步结果表明，在容量预测中考虑弯矩重分布和应变硬化效应对不锈钢结构的有效设计至关重要。
The use of stainless steel structures has increased during the last decade due to their durability, aesthetics and mechanical properties such as ductility, considerable strain hardening and excellent fire resistance. However, the majority of conducted research works have only focused on single isolated stainless steel members and advances in the analysis of stainless steel frames are limited. EN1993‐1‐4 does not provide global plastic design rules for indeterminate stainless steel structures, such as frames, despite their proved high ductility. On the other hand, the lack of guidance on plastic design is an obstacle for the optimal design of stainless steel structures, leading to uneconomical design. This paper presents a preliminary study on non‐sway stainless steel frames with stocky hollow cross‐sections. The study of the behaviour of stainless steel frames is based on numerical parametric studies, considering the nonlinear material behaviour and different stainless steel types (austenitic and ferritic). The paper deals with the redistribution of internal forces and assesses the existing methods based on global plastic design for frames with stocky cross‐sections, where alternative design approaches accounting for moment redistribution and strain hardening effects are analysed in addition to traditional plastic design method. Preliminary results demonstrate that including bending moment redistribution and strain hardening effects in capacity predictions is essential for an efficient design of stainless steel structures.