装配式自复位摇摆钢框架的恢复力模型

传统的钢框架结构在强烈地震作用下梁端和柱脚通常会出现塑性铰，导致结构产生较大的塑性变形。为此，提出了一种装配式自复位摇摆钢框架结构，阐述了该结构的构造形式与工作机理，通过理论分析建立了该结构的恢复力模型。设计了单层和双层的传统钢框架结构模型和装配式自复位摇摆钢框架结构模型，通过有限元软件ABAQUS对结构模型的滞回性能进行了有限元分析。对比研究表明：采用所建立恢复力模型的计算结果与有限元分析结果吻合较好，验证了恢复力模型的正确性；装配式自复位摇摆钢框架模型在循环荷载作用下滞回曲线为旗帜形,具有良好的自复位性能；当加载至层间位移角0.02rad时，装配式自复位摇摆钢框架的梁柱节点和柱脚无塑性铰出现，结构基本无损伤，而传统钢框架结构受损严重。

Restoring force model of prefabricated self-centering rocking steel moment-resisting frame

Plastic hinges normally occur at the beam-to-column connections and column bases of traditional steel moment-resisting frame structures under strong earthquakes, resulting in large plastic deformation of the structure. A type of prefabricated self-centering rocking steel moment-resisting frame structure was proposed. The configuration form and working mechanism of the structure were introduced. The restoring force model of the structure was established through theoretical analyses. The traditional steel moment-resisting frame structure model and the prefabricated self-centering rocking steel moment-resisting frame structure model of single-story and double-story structures were designed. The hysteretic behaviors of the structure models were simulated with the finite element software ABAQUS. The comparative research shows that the calculation results of restoring force model are in good agreement with those of finite element analyses, validating the correctness of restoring force model. The hysteretic curves of the prefabricated self-centering rocking steel moment-resisting frame model are flag-shaped under cyclic loading, indicating that the structure model possesses favorable self-centering capabilities. As the inter-story drift reaches 0.02 rad, no plastic hinges are found at the beam-to-column connections and column bases of the prefabricated self-centering rocking steel moment-resisting frame, confirming that the structure is basically undamaged, while the traditional moment-resisting steel frame structure is damaged seriously.