装配式自复位摇摆钢框架抗震性能研究

为了减轻传统钢框架在强震作用下的损伤与破坏，提出了具有自复位柱脚的装配式摇摆钢框架结构，阐述了该结构的构造形式与工作机理。设计并加工了一榀缩尺比例为1/4的摇摆钢框架，对其进行了低周反复加载试验和有限元模拟，研究其抗震性能。结果表明：利用复合组合碟形弹簧的弹性恢复力能够实现柱脚在强震作用下的可控摇摆，通过梁柱节点的消能减震装置有效控制了结构的累积损伤与残余变形；摇摆钢框架的滞回曲线是较为饱满的旗帜形，表明其具有较好的自复位性能和耗能性能；在加载至层间位移角1/30时，梁柱节点和柱脚没有发生任何屈服或屈曲，主体结构保持为弹性，损伤与破坏集中在消能减震装置处，拆卸和更换消能减震装置后，再加载曲线与原曲线基本吻合，有效实现了消能构件地震损伤可更换以及结构功能可恢复的设计目标；有限元的模拟结果与试验结果吻合较好，表明所建立的有限元模型能够较好地模拟摇摆钢框架在循环加载时的滞回性能。

Seismic performance study on prefabricated self-centering rocking steel frame

To reduce the damage of the traditional steel frames under strong earthquakes, a type of prefabricated steel frame structure with self-centering rocking column footings was proposed. The construction details and working mechanism of the frame were introduced. A rocking steel frame with a scale ratio of 1/4 was designed and manufactured. The low-cycle reversed loading tests and finite element simulation were carried out on the specimen to investigate its seismic performance. The research results show that the rocking steel frame realizes the controllable rocking of the column footings under strong earthquakes based on composite combination disc spring, whereas the cumulative damage and residual deformation of the frame are effectively controlled by the energy dissipation device of the beam-to-column connections. The frame exhibits relatively plump flag-shaped hysteretic loops, confirming that it possesses relatively good self-centering and energy dissipation capability. As the inter-story drift of the frame reaches the extremely rare inter-story drift ratio of 1/30, the beam-to-column connections and column bases do not show notable yielding or buckling, the main structure remains elastic and the damage is concentrated at the energy dissipation device. Moreover, the second-phase loading curves are consistent with the original loading curves after the energy dissipation device is removed and replaced by a new one, which effectively achieves the design goal that the energy dissipation device can be replaced and the structural functions can be restored after strong earthquakes. The results of finite element simulation agree well with test results, validating the established finite element model can reasonably predict the hysteretic behaviors of the rocking steel frame under cyclic loading.