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采用基于B-R运动准则的改进判别方法,结合结构时程响应曲线判定弦支穹顶结构的动力稳定性,研究拉索预应力、矢跨比对弦支穹顶动力稳定性能的影响。算例分析研究表明,在动力荷载作用下存在一组最优预应力,此时结构动力稳定临界荷载较大;在不同预应力作用下,随着矢跨比增大,结构临界荷载增大;在同一预应力作用下,随着矢跨比增大,结构临界荷载增大但幅度很小。
The dynamic stability of the suspen-dome structure is determined by improved discriminant method based on B-R motion criterion and structural response curve. The influence of prestressing force and pitch-span ratio on dynamic stability of suspend-dome is studied. A case study shows that there exists a set of optimal prestress under the action of dynamic load, and the critical load of structural dynamic stability is larger at this moment. Under different prestressing forces, the critical load of the structure increases with the increase of the span ratio. With the same prestressing force, the critical load of the structure increases but the amplitude is small with the increase of the aspect ratio.