大型装配式自复位剪力墙结构振动台试验研究

为研究装配式自复位剪力墙结构在地震作用下的低损伤特性以及新型节点连接形式的有效性，同济大学ILEE联合实验室与新西兰QuakeCoRE研究中心联合开展了大型装配式自复位剪力墙结构振动台试验研究。试验对象为二层足尺装配式结构，结构体系主要由承受重力荷载的外围框架和承担水平荷载的自复位剪力墙构成。框架柱为重力柱，梁柱节点为开槽梁节点，可减少梁伸长效应带来的楼板损伤；自复位剪力墙与楼板的连接，长边方向为柔性连接、短边方向为隔离式连接；一层楼板采用双T板，二层楼板采用压型钢板组合楼板；节点连接处设有钢、铅、黏滞等三类阻尼器。在振动台试验中考虑了不同地震水准、地震动输入、结构设计等对结构动力响应的影响。试验结果表明，该结构在1g地震动输入下仍具有低损伤、自复位特性，试验间多次更换阻尼器，成功实现了关键部件的可更换性。

Large-scale shaking table experimental study on a#br# low-damage self-centering wall building

To study the low-damage characteristics of precast self-centering wall structures under seismic inputs and innovate detailing validity, a system-level shaking table test of a full-scale precast self-centering concrete wall building has been conducted on the multi-functional shake-table array at Tongji University as part of an international collaborative project between ILEE and QuakeCoRE centers. The test building was designed with a perimeter frame carrying gravity loads and exterior post-tensioned concrete walls in both directions to resist seismic actions. The frame was gravity frame, and slotted-beam connections were used to reduce the beam elongation effect; Flexible and isolated wall-to-floor connections were applied in longitudinal and transverse direction, respectively. Double-Tee floor system and composite floor system were incorporated in test building Level 1 and Level 2, respectively. A number of alternative energy dissipation devices, including steel fuses, nonlinear viscous dampers and HF2V, were also installed at the wall base or/and slotted beam joints of the test building. Different earthquake input levels, ground motions and various design configurations were considered in the large-scale shaking table tests. The global response of test building validated the test building remained low-damaged and self-centering under earthquake input with PGA 1g. The energy dissipation devices were changed multiple times during the tests, and the replaceability of key components was realized successfully.