当前位置: X-MOL 学术Eng. Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Design of web-tapered steel I-section members by second-order inelastic analysis with strain limits
Engineering Structures ( IF 5.5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.engstruct.2020.111242
Chunyan Quan , Merih Kucukler , Leroy Gardner

Abstract A consistent design approach, performed by second-order inelastic analysis using beam finite elements with strain limits, is proposed for web-tapered steel members. In the proposed design approach, a geometrically and materially nonlinear analysis with imperfections (GMNIA) of the tapered steel member is carried out and the ultimate strength of the member is signified by reaching either the strain limit defined according to the Continuous Strength Method (CSM) or the peak load factor, whichever occurs first. To consider the beneficial effect of strain gradients along the lengths of the members on local cross-section resistances, the strains are averaged over the local buckling half-wavelength. The accuracy of the proposed design approach is verified against results from nonlinear shell finite element modelling as well as a number of experiments on tapered members considering various taper ratios, loading conditions and member slenderness values. The proposed method provides more accurate and consistent ultimate strength predictions than EN 1993-1-1 [1] , because the following aspects, which are ignored in traditional design methods, are captured: (1) the interaction between cross-section elements for the consideration of local buckling, (2) the influence of local moment gradients on cross-section resistance, (3) the partial plastification of cross-sections and (4) strain hardening.

中文翻译:

基于应变极限的二阶非弹性分析设计腹板锥形钢工字钢构件

摘要 针对腹板锥形钢构件,提出了一种使用具有应变限制的梁有限元进行二阶非弹性分析的一致设计方法。在建议的设计方法中,对锥形钢构件进行几何和材料非线性分析(GMNIA)并通过达到根据连续强度方法(CSM)定义的应变极限来表示构件的极限强度或峰值负载系数,以先发生者为准。为了考虑沿构件长度的应变梯度对局部横截面电阻的有益影响,应变在局部屈曲半波长上取平均值。所提出的设计方法的准确性通过非线性壳有限元建模的结果以及考虑各种锥度比、载荷条件和构件细长值的锥形构件的大量实验得到验证。所提出的方法提供了比 EN 1993-1-1 [1] 更准确和一致的极限强度预测,因为捕获了传统设计方法中忽略的以下方面:(1) 横截面元素之间的相互作用考虑局部屈曲,(2) 局部力矩梯度对截面阻力的影响,(3) 截面的局部塑化和 (4) 应变硬化。
更新日期:2020-12-01
down
wechat
bug