NEESR: Seismic Performance and Design of Partially-Grouted Reinforced Masonry Buildings

NEESR：部分灌浆钢筋砌体建筑的抗震性能和设计

• 批准号: 1208208
• 负责人: P. Benson Shing
• 金额: $ 115万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1208208&HistoricalAwards=false
• 关键词: NEESR; Seismic; Performance; Design; Partially

Reinforced masonry construction constitutes about ten percent of all low-rise buildings in the United States. Many of them are commercial, industrial, and school buildings. It is also used for multi-story hotels, college dormitories, and apartments. While most of the reinforced masonry structures constructed in the west coast are fully grouted, almost all reinforced masonry construction in the rest of the country, including regions of high seismic risk, has partial grouting to make it economically competitive. Walls are the main seismic load resisting elements in a masonry structure. The seismic performance of partially grouted reinforced masonry wall systems has not been sufficiently studied and is not well understood due to the complexity of their behavior, which can be attributed to the heterogeneity and anisotropy introduced by masonry blocks, block cavities, mortar joints, and grouted cells. Recent studies have shown that current seismic design provisions for partially-grouted masonry walls are not adequate and likely to be unconservative. However, the seismic safety of these structures also depends on their system-level performance, which is even less understood. This research will advance understanding of the behavior of partially-grouted masonry structures at the system, as well as component, level and develop and validate economically competitive design details and retrofit methods to make new and existing partially-grouted reinforced masonry structures better achieve current seismic performance standards. To this end, seventeen partially-grouted reinforced masonry wall components and subassemblies will be tested with quasi-static cyclic loading, and two full-scale, one-story buildings will be tested with earthquake ground motions on a shake table. An analytical method will be derived to provide more comprehensive assessment of the shear capacities of these walls than available in current codes. Furthermore, advanced computational models will be developed and calibrated with the test data to provide a simulation tool that can be used to better understand the performance of these structures at the global and local levels, and for use in performance-based seismic design. This research is a collaborative effort among the University of California at San Diego, Drexel University, and University of Minnesota. The experimental work will use the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) shake table at the University of California at San Diego, and the hybrid simulation facility at Lehigh University. Data from this project will be archived and made available to the public through the NEES Project Warehouse/data repository (http://www.nees.org).Reinforced masonry has many desirable properties as a construction material, such as durability and energy efficiency. Masonry can also contribute significantly to green and sustainable construction with the use of recycled aggregate and high quantity of fly ash in the ingredients. However, the lack of adequate research and well-developed seismic design provisions as compared to other construction materials has led to a steady decline in the use of reinforced masonry. The seismic performance of partially-grouted masonry is of primary importance for many regions in the United States that are susceptible to low-probability but high-consequence seismic events. The research will result in economically competitive design details and retrofit methods to enhance the seismic performance and safety of these structures. The research will provide unique educational experiences and training to graduate and undergraduate students at the three participating universities. The K-12 education component will develop a demonstration module that relates mathematics and sciences to technologies that enhance the safety of the built environment. The project will utilize an advisory panel with members from code development bodies, industry, and professional practice. Research results and recommendations from this project will be communicated to relevant seismic design code committees for timely implementation to lead to safer, earthquake-resilient masonry construction. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).

在美国，钢筋砌体结构约占所有低层建筑的10%。其中许多是商业、工业和学校建筑。它也用于多层酒店，大学宿舍和公寓。虽然在西海岸建造的大多数钢筋砌体结构都是完全灌浆的，但在该国其他地区，包括高地震风险地区，几乎所有的钢筋砌体结构都有部分灌浆，以使其具有经济竞争力。墙体是砌体结构中主要的抗震构件。部分灌浆加固砌体墙系统的抗震性能尚未得到充分的研究，并没有得到很好的理解，由于其行为的复杂性，这可以归因于砌体块，块腔，砂浆接缝，和灌浆细胞引入的非均匀性和各向异性。最近的研究表明，目前的抗震设计规定部分灌浆砌体墙是不够的，可能是不保守的。然而，这些结构的地震安全性还取决于其系统级性能，而人们对这一点的了解却更少。本研究将促进对部分灌浆砌体结构在系统以及组件水平上的行为的理解，并开发和验证具有经济竞争力的设计细节和改造方法，以使新的和现有的部分灌浆配筋砌体结构更好地达到当前的抗震性能标准。为此，将对17个部分灌浆的配筋砌体墙构件和砌块进行准静态循环荷载试验，并对两个全尺寸单层建筑物进行振动台地震地面运动试验。将推导出一种分析方法，以提供比现行规范更全面的抗剪承载力评估。此外，还将开发先进的计算模型，并利用测试数据进行校准，以提供一种模拟工具，用于更好地了解这些结构在全球和地方一级的性能，并用于基于性能的抗震设计。这项研究是加州大学圣地亚哥分校、德雷克塞尔大学和明尼苏达大学的合作成果。实验工作将使用乔治E.小布朗在圣地亚哥的加州大学的地震工程模拟网络（NEES）振动台，以及在利哈伊大学的混合模拟设施。该项目的数据将通过NEES项目仓库/数据存储库（http：//www.example.com）存档并向公众提供。钢筋砌体作为建筑材料具有许多理想的性能，例如耐久性和能源效率。www.nees.org通过使用再生骨料和高含量的粉煤灰，Masstellate还可以为绿色和可持续建筑做出重大贡献。然而，与其他建筑材料相比，缺乏足够的研究和完善的抗震设计规定，导致钢筋砌体的使用稳步下降。部分灌浆砌体的抗震性能是美国许多地区的首要任务，这些地区容易受到低概率但高后果的地震事件的影响。这项研究将产生具有经济竞争力的设计细节和改造方法，以提高这些结构的抗震性能和安全性。这项研究将为三所参与大学的研究生和本科生提供独特的教育经验和培训。K-12教育部分将开发一个示范模块，将数学和科学与加强建筑环境安全的技术联系起来。该项目将利用一个咨询小组，其成员来自代码开发机构、行业和专业实践。该项目的研究结果和建议将传达给相关的抗震设计规范委员会，以便及时实施，从而实现更安全的抗震砌体结构。 该奖项是国家减少地震灾害计划（NEHRP）的一部分。