12.14: Ultimate response and design of stainless steel continuous beams
12.14: Ultimate response and design of stainless steel continuous beams
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12.14：不锈钢连续梁的极限响应与设计
DOI：
10.1002/cepa.414
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Kokosis G
中科院分区：
文献类型：
--
作者：
Kokosis G
由于缺乏可用的实验数据，目前欧洲规范3：第1.4部分不允许不锈钢（SS）超静定结构的塑性设计，尽管材料具有良好的延性和1级细长极限，从而影响设计效率。初始材料成本高，需要开发新的设计程序，与观察到的结构响应一致，充分利用其优点，提高成本效益并最大限度地减少材料消耗。本文主要研究不锈钢连续梁的响应和设计。开发了奥氏体和贫双相不锈钢SHS和RHS的有限元模型，并根据已发表的试验数据进行了验证。使用经过验证的有限元模型进行参数研究，以获得横截面细长度、横截面长宽比、弯矩梯度和载荷布置范围内的结构性能数据。根据所获得的结果，可以得出结论，目前的欧洲规范3：第1.4部分的方法大大低估了连续梁的强度。这是因为在具有足够变形能力的超静定结构中连续塑性铰和弯矩重分布的形成以及横截面水平的应变硬化效应没有考虑在内。结果表明，考虑应变硬化和弯矩重分布对设计至关重要。为此，连续强度法（CSM）合理地考虑了截面水平的局部屈曲，并将其应用于不锈钢超静定结构的设计。进一步的研究正在进行中，以量化高剪应力对设计过程的影响，并将该方法扩展到基于销接和基于固定的不锈钢框架的设计。
Due to lack of available experimental data, plastic design of stainless steel (SS) indeterminate structures is currently not permitted by Eurocode 3: Part 1.4, despite the excellent material ductility and the existence of a Class 1 slenderness limit, thereby compromising design efficiency. The high initial material cost warrants the development of novel design procedures, in line with the observed structural response, which fully utilise its merits, improve cost‐effectiveness and minimise material consumption. This paper focuses on the response and design of stainless steel continuous beams. FE models of austenitic and lean duplex stainless steel SHS and RHS were developed and validated against published test data. The validated FE models were used to conduct parametric studies, in order to obtain structural performance data over a range of cross‐sectional slendernesses, cross section aspect ratios, moment gradients and loading arrangements. Based on obtained results, it was concluded that the current Eurocode 3: Part 1.4 approach significantly underestimates the strength of continuous beams. This is because the formation of successive plastic hinges and moment redistribution in indeterminate structures with adequate deformation capacity, as well as the effect of strain‐hardening at cross‐sectional level, are not accounted for. It is shown that accounting for both strain‐hardening and moment redistribution is of paramount importance for design. To this end, the application of the Continuous Strength Method (CSM), which rationally accounts for local buckling at cross‐section level, is extended to the design of stainless steel indeterminate structures. Further research is underway to quantify the effect of high shear stresses on the design procedure and to extend the method to the design of pinned based and fixed based stainless steel frames.
通信机器人模型设计
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
Hideki Kozima;Yuriko Yasuda;Cocoro Nakagawa;Hideki Kozima;小嶋 秀樹;小嶋 秀樹;小嶋 秀樹
通讯作者：
小嶋 秀樹