• 1. 半刚性框架: semi-rigid steel frames
• 2. 半刚接钢框架: semi-rigid steel-frame structure

• 1.外部钢框架进一步简化为半刚架和相应的弹性阶梯形等效弯曲杆的串联体系，这种简化模型能考虑柱轴向变形对结构动力反应的影响；
  The external steel frames are simplified as a series of half frames and the core tube is modeled as a bending and shearing two spring system.
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• 2.由于门式刚架自身的特殊问题，如允许构件腹板局部屈曲和半刚性连接等不同于其他结构的受力特点，因此，急需开展这种结构形式的抗震性能研究。
  As its special property, such as permission of web buckling behavior and semi-rigid connection, is different from other structural systems, it is necessary to study on its seismic behavior.
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