Experimental and Analytical Investigations of Shake Table Tests of a Reinforced Concrete Structure at the E-Defense Shake Table Facility

E-Defense 振动台设施钢筋混凝土结构振动台试验的实验和分析研究

• 批准号: 1201168
• 负责人: Wassim Ghannoum
• 金额: $ 10.92万
• 依托单位: University of Texas at Austin
• 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 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1201168&HistoricalAwards=false
• 关键词: Experimental; Analytical; Investigations; Shake; Table

In December 2010, two full-scale four-story reinforced concrete building structures were tested at the National Research Institute for Earth Science and Disaster (NIED) E-Defense shake table facility in Miki City, Japan under increasing multi-directional seismic excitations to near collapse. The principal investigator and several U.S. researchers under NSF award 1110860 collaborated with Japanese investigators to instrument the specimens and observe the performance. Beams, columns, and slabs in the structure performed as expected. However shear walls and beam-column joints showed severe damage and loss of integrity even though designed according to current earthquake engineering practice. The experimental program presents wealth of data to study the accuracy of current analytical tools. Current analytical tools are calibrated based on pseudo-static experimental investigations of individual structural components. The structural engineering field has therefore resorted to a number of extrapolations to form analytical models of complete structural systems. The obvious consequence of such extrapolations is an inability to verify the validity of system level analytical results. The recorded data of test series presents a unique opportunity to study the accuracy of currently used analytical tools, identify parametric assumptions, and improve on analytical method for structural systems. Through this project critical guidance will be delivered on formulating analytical models for this type of structures.The shake table at the Japanese NIED/E-Defense facility has no counterpart in the world in terms of capacities of testing full-scale buildings for earthquake motions. The test series were performed on a full-scale four-story reinforced concrete building structure that reflected closely current U.S. practices for earthquake design. This test series is the only one to date of a full-scale, modern, seismically designed reinforced concrete structure subjected under controlled conditions to a real seismic event. The performance of structures was worse than anticipated, which raises serious questions about the adequacy of current seismic design and construction practices. This project will uncover the causes of this performance and provide recommendations for improvements in design practices. The research objectives will be achieved in close collaboration with Japanese researchers. A report and publications will be submitted to U.S. and Japanese journals to present key results to a broad audience. The Principal Investigator will use this project to strengthen ties with Japanese researchers and the E-Defense center. Graduate engineering students the University of Texas will benefit through classroom instructions and involvement in the research including travel to Japan to learn from Japanese researchers at the forefront of the field of earthquake engineering.

2010年12月，在日本三木市国家地球科学与灾害研究所(NIED)的防震地震台设施中，对两个全尺寸的四层钢筋混凝土建筑结构进行了测试，测试结果表明，多方向地震激励越来越大，接近倒塌。首席研究人员和美国国家科学基金会奖1110860下的几名研究人员与日本调查人员合作，为标本配备仪器并观察其性能。结构中的梁、柱和板的性能符合预期。然而，尽管剪力墙和梁柱节点是按现行抗震工程实践设计的，但它们仍然存在严重的破坏和完整性损失。该实验计划提供了丰富的数据来研究当前分析工具的准确性。目前的分析工具是基于对单个结构部件的拟静态实验调查进行校准的。因此，结构工程领域采用了许多外推方法来形成完整结构系统的分析模型。这种外推的明显后果是无法验证系统级分析结果的有效性。测试系列的记录数据为研究当前使用的分析工具的准确性、确定参数假设和改进结构系统的分析方法提供了一个独特的机会。通过这个项目，将为此类结构的分析模型的建立提供重要的指导。日本NIED/E-Defense设施的振动台在测试全尺寸建筑物地震运动方面的能力在世界上是无与伦比的。这一系列测试是在一个全尺寸的四层钢筋混凝土建筑结构上进行的，该结构紧密地反映了美国目前的抗震设计做法。这一系列试验是迄今为止唯一一个在受控条件下经受真实地震事件的全尺寸、现代化、抗震设计的钢筋混凝土结构试验系列。结构的性能比预期的要差，这对目前的抗震设计和施工实践的充分性提出了严重的问题。这个项目将揭示这种表现的原因，并提供改进设计实践的建议。研究目标将在与日本研究人员的密切合作下实现。一份报告和出版物将提交给美国和日本的期刊，向广大受众展示关键成果。首席调查员将利用这个项目加强与日本研究人员和电子防卫中心的联系。工程专业研究生德克萨斯大学将通过课堂教学和参与研究受益，包括前往日本向地震工程领域前沿的日本研究人员学习。