某水电站厂房空心钢管混凝土排架柱动力损伤情况分析

为探讨在地震荷载作用下钢管混凝土排架柱可能的损伤问题，根据钢管混凝土组合排架柱中钢管和核心混凝土的受力特点和损伤规律，对混凝土采用多轴损伤开裂本构模型、钢管采用双线性本构模型，基于有限元软件ADINA建立了三维有限元静动力仿真分析模型，据此分析了静力、动力条件下钢管、混凝土的塑性损伤规律。结果表明，静力工况时混凝土无损伤；动力工况时钢管混凝土排架柱结构空心率不宜大于0.35，否则核心混凝土容易出现开裂，钢管易发生局部屈曲；动力、静力工况时排架柱的最大水平位移值均符合现行规范的要求。显然，空心钢管混凝土组合排架柱具有良好的抗震性能。

Dynamic Damage Analysis of Hollow Concrete filled Steel Tubular Bent Frame Column in Hydropower House

To discuss the cumulative damage of hollow concrete filled steel tubular bent frame columns under seismic loading, three dimensional finite element simulation model under static and dynamic conditions was established based on ADINA. According to the mechanical characteristics and damage deformation of the steel tube and core concrete in concrete filled steel tube structure, a multi axial damage and cracking constitutive model was applied to concrete materials, and double linear constitutive model was applied to steel tube. The plastic damage law of steel tube and concrete were investigated under static working loads and seismic loading. The results showed that the concrete was without damage under static working loads, but the core concrete was prone to cracking and the steel tube was prone to buckling if the hollow ratio was greater than 0.35 under seismic loading; the maximum horizontal displacement was in line with the requirements of the current specification and the hollow concrete filled steel tubular composite bent frame column was quite capable of seismic resistance obviously.