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Computational Simulation of Local Damage in Structures

结构局部损伤的计算模拟

基本信息

批准号：
1434300
负责人：
Amit Kanvinde
金额：
$ 35.36万
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：
2014
资助国家：
美国
起止时间：
2014-10-01 至 2018-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1434300&HistoricalAwards=false
关键词：
Computational Simulation Local Damage Structures

项目摘要

Computer simulations are used to predict responses of a building or a bridge to extreme loading caused by earthquake, blast or hurricane. When subjected to these intense loads, damage is most often concentrated into small local zones within the structure. Computer Simulation of local damage and incorporating it with structural system is difficult because simulations of structures operate over large dimensions (more than 10-20 feet) whereas local damage occurs over small dimensions (a few inches). This research project will create a new method that will resolve this scale difference, enabling accurate simulation of structures under extreme loads. The research involves expertise from structural engineering as well as from computational mechanics. The results and software products resulting from this research will improve the safety and economy of the country's infrastructure of buildings and bridges. The involvement of underrepresented groups and the transfer of new knowledge to students will result in broader impacts. Localized damage in structural members occurs when cross-sectional or material loss of strength (i.e. softening) concentrates damage in a small region of the member. Accurate modeling of local damage is critical, because extreme limit states in structures (e.g. collapse) are highly sensitive to softening behavior that typically accompanies local damage. Current approaches to simulate local damage in structures are either extremely difficult in complex scenarios, or are pathologically mesh-sensitive, leading to inaccurate simulations in either case. This research seeks to bridge this scale gap between structural and local scales through use of a 'nonlocal' approach, by explicitly embedding cross-sectional and material length scales within constitutive and element formulations. The research will include theoretical development of nonlocal approaches for beam-column elements, to produce mesh-independent, accurate and robust simulations of local damage in reinforced concrete and steel members. This development will be informed by finite element simulation as well existing experimental data. This will be followed by numerical implementation and validation.

计算机模拟用于预测建筑物或桥梁对地震、爆炸或飓风引起的极端载荷的反应。当受到这些强烈的载荷时，损伤通常集中在结构内的小的局部区域。局部损伤的计算机模拟并将其与结构系统相结合是困难的，因为结构的模拟在大尺寸（超过10-20英尺）上操作，而局部损伤发生在小尺寸（几英寸）上。该研究项目将创建一种新的方法来解决这种尺度差异，从而能够准确模拟极端载荷下的结构。这项研究涉及结构工程和计算力学的专业知识。这项研究的成果和软件产品将提高该国建筑物和桥梁基础设施的安全性和经济性。代表性不足的群体的参与和向学生传授新知识将产生更广泛的影响。当横截面或材料强度损失（即软化）集中在构件的一个小区域时，结构构件中的局部损伤就会发生。局部损伤的精确建模是至关重要的，因为结构的极限状态（例如倒塌）对通常伴随局部损伤的软化行为非常敏感。目前模拟结构局部损伤的方法要么在复杂场景中极其困难，要么具有病理性网格敏感性，导致在任何一种情况下的模拟都不准确。本研究旨在通过使用“非局部”的方法，明确嵌入截面和材料的长度尺度内的本构和元素的配方，结构和局部尺度之间的差距，以弥合这一规模。该研究将包括非局部方法的理论发展梁柱元素，产生网格独立，准确和强大的模拟钢筋混凝土和钢构件的局部损伤。这一发展将通知有限元模拟以及现有的实验数据。随后将进行数值实施和验证。