Condition Assessment and Capacity Evaluation of Historic Steel Bridge

历史钢桥状况评价及承载能力评价

• 批准号: 9319878
• 负责人: Ahmet Aktan
• 金额: $ 20万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9319878&HistoricalAwards=false
• 关键词: Condition; Assessment; Capacity; Evaluation; Historic

9402392 Aktan PIs obtained permission from the City of Cincinnati to install an active vibration control system under the ballroom floor of the Cincinnati Convention Center. Highly perceptible floor vibration has occurred during large dance events, causing concern to ballroom patrons. The control system which will feature several electromagnetic actuators, several dozens of different types of sensor and a modular open hardware system will remain installed over a sufficiently long time period in order to permit other researchers in the national program to participate in many of the basic, system-integration and experimental demonstration aspects. The research will make use of the multiple sensor/actuator availability for developing an validating failure detection and accommodation algorithms which will have the capability to detect any hardware/software failures. The algorithms will be based on the adaptive modal filter concept which was used successfully for the active-control of the highway bridge. Also to be explored is the development of a secondary capability of the control system to continuously monitor itself for accommodating the deliberate or random changes which will occur in the structural characteristics. Such a continuous monitoring of the facility characteristics will permit to uncouple the changes in the structural dynamic properties due to occupation/owner intervention from large fluctuations caused by ambient condition changes. As importantly, a realistic multi- output installation is expected to reveal as-yet-undiscovered phenomena such as those related to inter-component interactions. Such issues will have to be identified and addressed in order to bring this technology forward to widespread industry acceptance.

9402392 Aktan Pis获得了辛辛那提市的许可，在辛辛那提会议中心的宴会厅地板下安装了主动振动控制系统。 在大型舞蹈活动期间发生了高度可观的地板振动，引起了宴会厅的关注。 控制系统将具有多个电磁执行器，数十种不同类型的传感器和模块化的开放硬件系统将在足够长的时间内保持安装，以便允许国家计划中的其他研究人员参与许多基本的，系统整体和实验性演示方面。 该研究将利用多个传感器/执行器的可用性来开发验证的故障检测和适应算法，该算法将有能力检测任何硬件/软件故障。 该算法将基于自适应模态滤波器概念，该概念成功地用于高速公路桥的活动控制。 还需要探讨的是，控制系统的次要能力可以连续监视自身，以适应结构特征中会发生的故意或随机变化。 这种对设施特征的连续监测将允许使由于占用/所有者干预因周围条件变化引起的大量波动而导致结构动态性能的变化。 重要的是，预期现实的多输出安装将揭示尚未发现的现象，例如与组件间相互作用相关的现象。 必须确定和解决此类问题，以便将这项技术转发到广泛的行业接受。