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为研究钢框架-预应力索支撑结构由于索突然断裂破坏引起的动效应,采用瞬时加载法,对单侧索破断后的剩余结构分别用简化理论模型和有限元模型进行了动力反应分析。研究结果表明:当结构在整个振动过程中处于线弹性状态时,动效应仅与索阻尼比以及失效时间相关,动力响应系数最大值接近2.0,且动力系数随索失效时间和阻尼比的增大而减小;但当结构在整个振动过程中屈服进入塑性状态后,动力效应还与需求能力比有关,动力响应系数随需求能力比增大而增大,直至出现动力发散;结构中破断索卸载产生的冲击被未破断索的拉力抵消了,从而钢框架不易进入塑性。
In order to study the dynamic effect of the steel frame-prestressed cable support structure due to the sudden failure of cables, transient load method was used to analyze the dynamic response of the remaining structures after unilateral cable breakage by using simplified theoretical model and finite element model respectively. The results show that the dynamic response is only related to the cable damping ratio and the failure time when the structure is in a linear elastic state. The maximum dynamic response coefficient is close to 2.0, and the dynamic coefficient increases with the failure time and the damping ratio But when the structure surrenders into the plastic state during the entire vibration process, the dynamic effect is also related to the demand-ability ratio, and the dynamic response coefficient increases as the required capacity ratio increases until the power divergence occurs. In the structure, the broken cable unloading The resulting impact is offset by the tension of the unbroken cable, so that the steel frame does not easily enter plasticity.