Simulation of Interactive Cyclic Local-Global Buckling in Steel Members Using Nonlocal Hybrid Element

使用非局部混合单元模拟钢构件中交互式循环局部-全局屈曲

• 批准号: 1926202
• 负责人: Amit Kanvinde
• 金额: $ 32.19万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1926202&HistoricalAwards=false
• 关键词: Simulation; Interactive; Cyclic; Local; Global

Computer simulations are essential for predicting how buildings and other infrastructure will perform under extreme situations such as earthquakes or hurricanes. Under such conditions, steel structures often collapse due to twisting and buckling of its parts (beams and columns). This type of failure is challenging to simulate in computer models, because current methods cannot represent the physical mechanisms of twisting and buckling or their interactions in an effective manner. This award supports fundamental research to create a method that represents the physics of these processes in a novel way, enabling more accurate simulation of structural failure under extreme loads. The findings and software technology from this research will enhance the resilience of buildings and other infrastructure, benefiting the nation's society and economy. The involvement of underrepresented groups, education of students with new knowledge, and technology transfer to practitioners will result in broader impacts. Steel members often fail under extreme loads due to interactions between twisting and buckling under cyclic loading that occurs in earthquakes. This process leads to loss in strength, ultimately leading to structural collapse. Currently used methods for modeling this process do not directly simulate the physical phenomena of warping, twisting and buckling, and are therefore severely compromised in terms of their accuracy in predicting failure. This research is a new scientific formulation in which the warping and twisting of members is represented in a novel manner. This formulation also allows for the incorporation of buckling through a 'nonlocal' approach such that results are not mesh-sensitive (meaning that they are objective). The scientific formulation will be implemented in an open-source numerical platform that is popular among structural engineers and researchers. This approach (including its implementation) will be informed and validated rigorously by extensive available experimental datasets and finite element simulation, and broadly disseminated to target audiences and user groups.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

计算机模拟对于预测建筑物和其他基础设施在地震或飓风等极端情况下的表现至关重要。在这样的条件下，钢结构经常由于其部件（梁和柱）的扭曲和屈曲而倒塌。这种类型的故障是具有挑战性的计算机模型模拟，因为目前的方法不能代表扭曲和屈曲的物理机制或它们的相互作用，在一个有效的方式。该奖项支持基础研究，以创建一种以新颖方式代表这些过程的物理学的方法，从而能够更准确地模拟极端载荷下的结构失效。这项研究的结果和软件技术将提高建筑物和其他基础设施的弹性，造福国家的社会和经济。代表性不足的群体的参与、对学生的新知识教育以及向从业人员的技术转让将产生更广泛的影响。由于在地震中发生的循环荷载下扭转和屈曲之间的相互作用，钢构件经常在极端荷载下失效。这个过程导致强度损失，最终导致结构倒塌。目前使用的建模方法，这个过程不直接模拟翘曲，扭曲和屈曲的物理现象，因此，严重损害其预测故障的准确性。这项研究是一个新的科学公式，其中的翘曲和扭曲的成员是代表在一个新的方式。该公式还允许通过“非局部”方法将屈曲纳入，使得结果不是网格敏感的（意味着它们是客观的）。科学公式将在结构工程师和研究人员中流行的开源数值平台中实施。这一方法（包括其实施）将通过广泛的实验数据集和有限元模拟得到严格的信息和验证，并广泛传播给目标受众和用户群。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

A Displacement-Based Fiber Element to Simulate Interactive Lateral Torsional and Local Buckling in Steel Members

基于位移的纤维单元来模拟钢构件中的交互式横向扭转和局部屈曲

• DOI: 10.1061/jsendh.steng-11889
• 发表时间: 2023
• 期刊: Journal of Structural Engineering
• 影响因子: 4.1
• 作者: Maity, Arka;Kanvinde, Amit;Heredia Rosa, Diego I.;de Castro e Sousa, Albano;Lignos, Dimitrios G.
• 通讯作者: Lignos, Dimitrios G.