U.S.-Turkey Cooperative Research: Seismic Retrofitting of Reinforced Concrete Structural Members by Composite Materials

0352947帕尔文描述：该奖项支持俄亥俄州托莱多大学土木工程系的阿扎德·帕尔文博士和土耳其伊斯坦布尔博加齐奇大学土木工程系的切姆·亚尔辛博士之间的合作研究。本文研究的重点是复合材料对钢筋混凝土结构构件的抗震加固。该项目将包括钢筋混凝土梁柱节点在模拟地震荷载下的全尺寸试验和有限元分析研究。在破坏性地震作用下，钢筋混凝土梁柱节点的破坏将导致结构的倒塌。结构系统的安全依赖于这些连接的性能。加固结构的一种方法是在梁柱节点上包裹几层薄层纤维复合材料，以提高其承载能力和延性，并在修复过程中最大限度地减少对其使用的影响。在这方面的研究主要集中在缩比模型上，这种模型可能不会考虑结构构件在地震荷载作用下的行为。对于通过小规模测试来验证理论预测和经验结果而言，对全尺寸样本的实验是必不可少的。这需要Bogazici大学提供的资源，而且可以实现，成本只有美国进行相同测试的一小部分。帕文博士通过参与数值和小规模实验分析，在梁柱节点的缠绕技术方面拥有丰富的经验。土耳其的主要建筑技术使用钢筋混凝土进行广泛的结构，因此具有丰富的知识和经验，研究人员很容易获得这些知识和经验。该项目将受益于美国和土耳其调查人员拥有的互补专业知识，以及土耳其建筑业和学术界对钢筋混凝土结构的大量领域知识。范围：研究结果将构成目前在很大程度上不存在的关于这些关节行为的宝贵知识基础，这将在拯救生命和经济方面对两国都有利。这项研究将为使用现代纤维复合材料的建筑和基础设施部件提供一个有吸引力的维修和翻新解决方案。这种材料在增强结构部件性能的同时，在强度、耐腐蚀、轻质和易于使用方面具有独特的性能。钢筋混凝土不仅在美国和土耳其，而且在全球范围内，都是一种广泛的结构的基本施工技术。该项目的活动涉及一名女性美国调查员，并将为托莱多大学的研究生提供一个获得国际研究经验的机会。它将为来自土耳其的科学家和研究生提供机会，将最先进的包裹技术用于关键结构部件-梁柱连接。该项目的成果将在期刊和会议记录上发表，并将纳入国际和平研究所提供的研究生课程。在项目结束时，合作者将提供关于加装钢筋混凝土结构构件的系列讲座。

0352947 ParvinDescription: This award supports a cooperative research between Dr. Azadeh Parvin, Department of Civil Engineering, University of Toledo, Toledo, Ohio, and Dr. Cem Yalcin, Department of Civil Engineering, Bogazici University, Istanbul, Turkey. The focus of the research is seismic retrofitting of reinforced concrete structural members by composite materials. The project will comprise full-scale experimentation on reinforced concrete beam-column joints retrofitted with composite wraps under simulated seismic loadings as well as a comprehensive analytical study using finite element method. Failure of reinforced concrete beam-column connections will result in the collapse of the structure during destructive earthquakes. The safety of structural systems relies on the behavior of these connections. One way of retrofitting structures is to wrap the beam-column connections with few thin layers of fiber composite fabrics to enhance their load carrying capacity and ductility, with minimum disruption to their usage during the rehabilitation procedure. Studies in this are have concentrated on scale-down models, which may not the behavior of size structural members under seismic loads. Experiments on full-scale specimens are essential to validate theoretical predictions and empirical findings through small-scale testing. This requires resources, which are available at Bogazici University, and can be realized at a fraction of the cost of performing the same tests in the United States. Dr. Parvin has experience in wrapping techniques on beam-column joints through involvement in numerical and small-scale experimental analyses. The main construction technology in Turkey utilizes reinforced concrete for a wide spectrum of structures and as such a wealth of knowledge and experience, which is readily available to researchers. This project will benefit from complementary expertise possessed by the US and Turkish investigators and substantial domain knowledge on reinforced concrete structures in Turkish construction industry and academia. Scope: Findings of the study will constitute valuable knowledge base currently nonexistent to a large degree on the behavior of these joints, which will benefit both countries in terms of saving lives and economics. The research will offer an attractive repair and retrofit solution for buildings and infrastructure components using modern fiber composite materials. Such materials have unique properties in terms of strength, resistance to corrosion, lightness, and ease of application while enhancing the performance of structural components. Reinforced concrete constitutes a fundamental construction technology for a wide spectrum of structures not only in US and Turkey, but also around the globe. The project activities involve a female US investigator, and will provide graduate students from the University of Toledo an opportunity for international research experience. It will provide a scientist and graduate student from Turkey an opportunity to use the state-of-the-art wrapping techniques to a critical structural component, the beam-column connection. Results of the project will be published in journals and conference proceedings and will be incorporated in a graduate course offered by the PI. At the completion of the project lecture series on retrofitting reinforced concrete structural members will be offered by the collaborators.