R/R: Seismic Rehabilitation of Architectural Precast Panels

CMMI-9318776，PI-NIELSON：现有建筑预制式幕墙嵌板可能具有在强震中容易失效的非延性连接细节。他们还可能经历了钢筋的严重腐蚀。锚定面板连接插件的钢筋的腐蚀同样降低了面板连接的强度和延展性。该项目进行了一项研究，以调查补救措施，以提高地震期间面板的抗震完整性。成功的修复方案要满足以下标准：(1)提供足够的强度来抵抗地震规范设计力和结构对实际地震地面运动的反应所产生的力，(2)提供足够的延性来适应实际的层间漂移，(3)适应包括钢和钢筋混凝土在内的各种结构框架方案，(4)实用和经济，对建筑物的功能破坏最小，以及(5)减少或消除面板钢筋腐蚀的可能性，并尽可能地减少地震恒载和结构的侧向设计荷载。实现这些目标的研究任务是：(1)构建和测试非延性连接细部。(2)设计合适的维修方案。(3)构造和测试维修细节，并验证其性能。(4)对整板维修系统进行动力分析。该项目得到了美国国家科学基金会“结构抗震修复与恢复研究”的资助。

CMMI-9318776, PI-NIELSON: Existing architectural precast curtain wall panels may have nonductile connection details that are prone to failure in strong earthquakes. They also may have experienced significant corrosion of the reinforcing steel. Corrosion of the bars anchoring the panel connection inserts likewise reduces the strength and ductility of the panel connections. This project conducts a study to investigate remedial procedures which will increase the seismic integrity of the panels during earthquakes. Successful rehabilitation schemes are developed to satisfy the following criteria: (1) provide adequate strength to resist both seismic code design forces and forces generated by structural response to actual earthquake ground motions, (2) provide adequate ductility to accommodate realistic interstory drifts, (3) accommodate a variety of structural framing schemes including both steel and reinforced concrete, (4) be practical and economical, requiring minimal disruption of a building's functions, and (5) reduce or eliminate the possibility of corrosion of the panel reinforcement, and possibly reduce the seismic dead load and lateral design load for the structure. Research tasks to achieve these are: (1) Construct and test nonductile connection details. (2) Design appropriate repair schemes. (3) Construct and test repair details and verify their performance. (4) Perform dynamic analyses of full-panel repair systems. This project is supported under the NSF Initiative "Repair and Rehabilitation Research for Seismic Resistance of Structures."