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杆件由于爆炸、腐蚀等发生脆性破坏后引起剩余结构的振动和压杆由于失稳过程中的弹性突跳(Snap-through)引起的相邻结构振动是张弦结构倒塌过程中常伴生的两种动力现象。本文对第一种动力响应产生的原因、失效构件的模拟方法进行了分析,说明进行张弦结构抗连续倒塌的动力分析应采用初始条件法模拟构件的失效。根据张弦结构的特点,从构件失效和结构失效两方面提出了张弦结构倒塌失效的评估准则,并采用变换荷载路径法通过静力连续倒塌分析找出张弦结构各部分的关键构件;然后采用初始条件法按考虑几何非线性、阻尼比、材料非线性等分别模拟这些关键构件失效引起的动力响应,得到了平面张弦结构各部分构件失效的动力特性、动力放大系数和失效构件的位置,并对不同失效时间进行动力响应分析得到张弦结构动力效应与构件失效时间的关系曲线。最后给出张弦结构进行抗连续倒塌分析的一些结论和建议,如进行连续倒塌动力时程分析时初始失效杆件选取和失效时间取值以及弹性动力放大系数与塑性动力放大系数的区别等,为张弦结构的抗连续倒塌设计提供技术支持和参考。
The vibration of the remaining structure caused by brittle failure of the rod due to explosion and corrosion, and the vibration of the adjacent structure caused by the snap-through of the pressure rod due to the instability process are two types that are often accompanied during the collapse of the string structure Power phenomenon. In this paper, the causes of the first dynamic response and the simulation methods of the failure components are analyzed. It is shown that the initial condition method should be used to simulate the failure of the component in the dynamic analysis of the anti-continuous collapse of the string structure. According to the characteristics of string string structure, the evaluation criteria of the failure of the string string structure are put forward from both the failure of components and the failure of structure, and the key components of each part of the string string structure are found out by the method of CFD The initial condition method is used to simulate the dynamic response caused by the failure of these key components respectively considering geometric nonlinearity, damping ratio and material nonlinearity. The dynamic characteristics of failure of various components of the planar chord structure, the dynamic amplification factor and the position of the failed component , And dynamic response analysis of different failure time to get the relationship between dynamic effect of string structure and component failure time. Finally, some conclusions and suggestions of the anti-continuous collapse analysis of the string structure are given, such as the selection of the initial failure member and the failure time value and the difference between the elastic dynamic amplification factor and the plastic dynamic amplification factor during the continuous collapse dynamic time history analysis, Provide technical support and reference for anti-continuous collapse design of string structure.