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在地震或飓风等极端情况下的建筑物和其他基础设施的表现至关重要。在这样的条件下，钢结构通常由于其零件的扭曲和屈曲而倒塌（梁和圆柱）。这种类型的故障在计算机模型中模拟很具有挑战性，因为当前方法不能以有效的方式代表扭曲和屈曲的物理机制或其相互作用。该奖项支持基本研究，以创建一种以新颖方式代表这些过程物理学的方法，从而更准确地模拟了极端负载下的结构故障。这项研究的发现和软件技术将增强建筑物和其他基础设施的弹性，从而使国家的社会和经济受益。代表性不足的群体，具有新知识的学生的教育以及向从业人员进行技术转移的参与将产生更大的影响。由于地震中发生的循环负荷下的扭曲和屈曲之间的相互作用，钢构件通常在极端负荷下失败。这个过程导致力量损失，最终导致结构崩溃。目前使用的用于对该过程进行建模的方法并不能直接模拟翘曲，扭曲和屈曲的物理现象，因此在预测故障的准确性方面受到严重损害。这项研究是一种新的科学表述，其中成员的扭曲和扭曲以新颖的方式表示。该公式还允许通过“非本地”方法并发屈曲，从而使结果不敏感（这意味着它们是客观的）。科学配方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。这种方法（包括其实施）将通过广泛可用的实验数据集和有限元模拟进行严格的知识和验证，并广泛地传播到目标受众和用户群体。这项奖项反映了NSF的法定任务，并被认为是值得通过使用评估的支持，基金会的智力优点和更广泛的影响评论标准。

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.