对钢框架结构在截面受损情况下进行动力稳定性分析，建立截面不同受损伤状态下的钢框架有限元分析模型，分析在不同幅值的地震波作用下结构的最大水平位移。根据第二类动力稳定性理论，得出结构发生动力失稳时的临界地震荷载，并与未受损情况比较，得出底层柱腹板、翼缘处受损将使结构更容易发生动力失稳的结论。%This article makes an analysis to the dynamic stability of steel frame structure in section damage case,establishes different cross-section steel frame damage model,and analyzes structure horizontal dis-placements under the action of seismic wave with different amplitudes.According to the second class of dy-namic stability theory,critical seismic load when structure is in dynamic instability has been derived.This is compared with the undamaged case to draw the conclusion that the dynamic instability of structures easily happen in damaged bottom column web,and damaged flange structure.
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