CAREER: Fracture Analyses in Concrete via Experimentation & Simulation (FRANCES): Examining Discrete Crack and Fracture Modeling of Concrete Under Blast and Impact Loading

职业：通过实验进行混凝土断裂分析

• 批准号: 0748085
• 负责人: Ganesh Thiagarajan
• 金额: $ 40万
• 依托单位: University of Missouri-Kansas City
• 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: 2008-02-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0748085&HistoricalAwards=false
• 关键词: CAREER; Fracture; Analyses; Concrete; via

The research objective of this Faculty Early Career Development (CAREER) Program project is to develop a fracture-constitutive multi-scale model which is able to simulate dynamic fracture in concrete subjected to extreme loadings. The non-linear and fracture behavior of concrete when subjected to dynamic loads such as blast and impact is an increasingly important consideration when designing critical protective structures. To validate the model to be developed, test data collected from a drop tower impact test and blast response data obtained from a shock tube test on reinforced concrete panels will be used. The impact and blast loading tests will be conducted at the US Army Corps of Engineers-Engineering Research and Development Center at Vicksburg, Mississippi. The numerical model will be able to simulate discrete crack initiation without any pre-specifications about the crack path. The numerical model will be implemented in the popular commercial finite element programs ABAQUS and LSDYNA and verified using the project data and other available experimental test data. The behavior of a seven story reinforced concrete structure subjected to blast loading will be simulated and studied. The enhancements to the numerical model will also be utilized in the PI's current study of the mechanical behavior of nano-sized particles such as minerals and collagen fibrils present in dentin and bone.For broader impact and dissemination of the results, the project will develop educational materials for designers and educators. Examples given in Federal Emergency Management Agency Publication 451 will be augmented to include the blast loading case, as specified in ASCE 7 commentary. The research results will also be made available to code writing bodies such as ACI 318 to incorporate the strain rate effects in design provisions. Besides the graduate students, the undergraduate students will also be involved in the project through NSF and the university programs such as SEARCH. Outreach activities with High School students will be incorporated through the NSF funded project ARROWS.

本学院早期职业发展（Career）计划项目的研究目标是开发一种断裂本构多尺度模型，能够模拟混凝土在极端载荷下的动态断裂。混凝土在爆炸和冲击等动荷载作用下的非线性和断裂行为是设计关键防护结构时日益重要的考虑因素。为了验证即将开发的模型，将使用从落塔冲击试验收集的测试数据和从钢筋混凝土板上的激波管试验获得的爆炸响应数据。冲击和爆炸载荷测试将在密西西比州维克斯堡的美国陆军工程兵团工程研究与发展中心进行。该数值模型将能够模拟离散裂纹起裂，而无需任何有关裂纹路径的预先规范。数值模型将在流行的商业有限元程序ABAQUS和LSDYNA中实现，并使用项目数据和其他可用的实验测试数据进行验证。对某七层钢筋混凝土结构在爆炸荷载作用下的受力特性进行了模拟研究。数值模型的增强也将用于PI目前对纳米颗粒（如牙本质和骨骼中存在的矿物质和胶原原纤维）的力学行为的研究。为了扩大影响和传播结果，该项目将为设计师和教育工作者编写教育材料。联邦紧急事务管理局出版物451中给出的例子将予以扩充，以包括ASCE 7评论中规定的爆炸加载情况。研究结果也将提供给代码编写机构，如ACI 318，以将应变率效应纳入设计条款。除研究生外，本科生也将通过NSF和SEARCH等大学项目参与该项目。与高中生的外展活动将通过NSF资助的项目ARROWS纳入。