五层足尺预应力压接装配框架结构抗连续倒塌能力有限元分析

Finite element analysis on progressive collapse resistance of five story full-scale prestressed precast frame

为研究预应力压接装配混凝土框架(PPEFF)体系的抗连续倒塌性能,基于ABAQUS/Standard隐式有限元分析平台,采用多尺度非线性动力分析模型对五层足尺试验模型的顶层角柱、四层边柱和底层角柱失效后的状态分别进行了有限元模拟,并与试验结果进行了对比。在此基础上对拆柱等效冲击加载时间、有无楼板作用和楼面重力荷载代表值大小进行参数分析,分析了相关参数对PPEFF抗连续倒塌性能的影响。研究结果表明:有限元分析结果与试验结果吻合良好;拆柱等效冲击加载时间对结构的稳态位移影响较小,试验采用滑块与双微摩擦面构造的加载方法可行;楼板对结构的抗连续倒塌性能有较大影响,能够降低剩余结构的竖向振动幅度,提高剩余结构的抗连续倒塌性能;楼面重力荷载代表值提升100%的情况下,仅局部混凝土进入塑性,钢筋与预应力筋仍处于弹性工作状态,结构变形较小,PPEFF仍具有良好抗连续倒塌性能。

To study the progressive collapse resistance of the precast prestressed efficiently fabricated frame(PPEFF)system,based on the ABAQUS/standard implicit finite element analysis platform,a multi-scale nonlinear dynamic analysis model is used to simulate the state of the five story full-scale test model under the conditions of failure of the top corner column,the side column on the fourth floor and the bottom corner column,respectively,and the results were compared with the test results.On this basis,a parametric study was conducted to investigate the effects of various parameters on the progressive collapse resistance of the PPEFF system;the investigated parameters included the equivalent impact loading time of columns,the presence or absence of floor action and the representative value of floor gravity load.The numerical analysis results are in good agreement with the experimental results.The equivalent impact loading time is shown to have little effect on the steady state displacement of the structure,and the loading method of using the slider and double micro friction surfaces is feasible.The floor slab is shown to have great influence on the progressive collapse resistance of the structure,since the floor slab can significantly reduce the vertical vibration amplitude of the remaining structure and thus improve the progressive collapse resistance of the remaining structure.When the representative value of floor gravity load is doubled,only part of the concrete enters the plastic state,the reinforcement and prestressed reinforcement are in the elastic state,the structural deformation is small,and the PPEFF system still has good progressive collapse resistance performance.