Collaborative Research: Multi-Scale Simulation of Low-Triaxiality Fracture and Ultra Low Cycle Fatigue in Steel Structures

合作研究：钢结构低三轴度断裂和超低周疲劳的多尺度模拟

• 批准号: 0825339
• 负责人: Gregory Deierlein
• 金额: $ 21.3万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-10-01 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825339&HistoricalAwards=false
• 关键词: Collaborative; Research; Multi; Scale; Simulation

Fracture or fatigue (i.e. cracking due to large and repeated loads) in steel structures often results in great damage to property as well as loss of life. Recently, structural fracture has been observed in the I-35 bridge collapse in Minneapolis and to over 100 buildings that experienced shaking in the 1994 Northridge Earthquake in the Los Angeles area. Motivated by these events, this project will develop improved methods to predict fracture in steel structures such as bridges, buildings, industrial facilities, or ships. The research focus will be on understanding a special type of ductile fracture that originates on the surfaces or corners of structures. The investigation will involve a program of laboratory testing and complementary finite element computer analysis to evaluate critical values of stresses and strains that cause surface fracture in structural steel. The project will culminate in the development of computational models that will enable engineers and scientists to accurately calculate and mitigate the risk of fracture in steel structures.The models developed through this research will enable the design and construction of buildings, bridges and other structures that are safer and more fracture resistant. To disseminate and promote use of the research findings, the principal investigators will educate engineers through workshops, training courses and technical publications. In addition, the research project will form the basis of doctoral theses for two graduate students who, equipped with the advanced knowledge created during this research, will further develop and disseminate the research findings.

钢结构中的断裂或疲劳（即由于大的和重复的载荷而产生的开裂）通常会导致巨大的财产损失以及寿命损失。最近，在明尼阿波利斯的I-35桥倒塌和1994年洛杉矶地区北岭地震中经历摇晃的100多座建筑物中观察到了结构断裂。受这些事件的启发，本项目将开发改进的方法来预测桥梁、建筑物、工业设施或船舶等钢结构的断裂。研究的重点将是了解一种特殊类型的韧性断裂，起源于结构的表面或角落。调查将包括实验室测试和补充有限元计算机分析的程序，以评估导致结构钢表面断裂的应力和应变的临界值。该项目将最终开发计算模型，使工程师和科学家能够准确计算和减轻钢结构的断裂风险。通过这项研究开发的模型将使建筑物，桥梁和其他结构的设计和建造更加安全，更耐断裂。为了传播和促进研究结果的使用，主要研究人员将通过讲习班、培训课程和技术出版物对工程师进行教育。此外，该研究项目将为两名研究生的博士论文奠定基础，他们将利用本研究期间创造的先进知识，进一步发展和传播研究成果。