EAPSI: Numerical Modeling of Low-Rise Reinforced Concrete Shear Walls with High-Strength Materials

最近的地震(例如，1994年的北岭地震、2010年的智利地震)提醒我们，在建筑结构的抗震设计方面仍有许多研究要做。在许多低层钢筋混凝土(RC)结构中，抗地震的主要横向荷载体系是剪力墙，这是住宅和核安全相关应用中常见的。通过使用高强度钢筋和高强混凝土，可以提高低剪力墙的效率。然而，由于缺乏研究和试验，高强钢筋在大多数应用中尚未被美国混凝土协会建筑规范所接受。本研究的目的是为了更好地了解采用高强材料的低层钢筋混凝土剪力墙的性能。该项目将在东京大学地震研究所进行，东道主研究员加北泽俊美教授。研究成果不仅可以降低工程造价，还可以提高这些结构在地震作用下的抗震性和可靠性。由于低层钢筋混凝土墙的高长高宽比较小(小于2：1)，其破坏以剪力为主，具有非延性和强度制约的特点。这种破坏机制与高强钢筋和高强混凝土的材料特性相匹配，它们使用更少的材料提供更高的抗力。首席研究员将对实验墙体样本进行测试前和测试后的详细数值分析，圣母大学正在进行测试，这是美国能源部资助的一个项目的一部分。将实施和比较美国和日本开发的数值模拟技术。研究结果将为后续试验墙试件参数的设计提供参考，如配筋率、配筋率、混凝土抗压强度和弯剪比。该奖项由东亚和太平洋暑期学院项目资助一名美国研究生的暑期研究，由NSF和日本科学促进会共同资助。

Recent earthquakes (e.g., Northridge 1994, Chile 2010) are reminders that there is still much research to be done on the seismic design of building structures. In many low-rise reinforced concrete (RC) structures, common in residential and nuclear-safety related applications), the primary lateral load resisting systems against earthquakes are shear walls. It would be possible to increase the efficiency of low-rise shear walls by using high-strength steel reinforcement and high-strength concrete. However, due to lack of research and testing, high-strength reinforcement in most applications is not yet accepted by the American Concrete Institute building codes. The aim of this research is to better understand the behavior of low-rise RC shear walls with high-strength materials. The project will be conducted at the Earthquake Research Institute, University of Tokyo, with host researcher, Prof. Toshimi Kabeyasawa. The results of the research have the potential to not only cut construction costs but also improve the resistance and reliability of these structures under seismic hazards. Due to their low height-to-length aspect ratio (smaller than 2:1), the failure of low-rise RC walls is dominated by shear, which is non-ductile and strength governed. This failure mechanism matches the material properties of high-strength reinforcement and high-strength concrete, which provide higher resistance utilizing less material. The principal investigator will perform pre- and post-test detailed numerical analyses of experimental wall specimens, which are being tested at the University of Notre Dame as part of a project funded by the U.S. Department of Energy. Numerical modeling techniques from the U.S. as well as those developed in Japan will be implemented and compared. The results of the study will be integral for the design of subsequent experimental wall test specimen parameters, such as reinforcement grade, reinforcement ratio, concrete compressive strength, and moment-to-shear ratio. This award under the East Asia and Pacific Summer Institutes program supports summer research by a U.S. graduate student and is jointly funded by NSF and the Japan Society for the Promotion of Science.