基于ABAQUS损伤塑性模型的越层柱抗震性能研究

Seismic Performance Analysis of Skip-floor Column Based on Damaged Plasticity Model of ABAQUS

结构抗震设计中,越层柱通常被视为薄弱部位,往往按照经验对其进行加强处理,缺乏可靠的理论指导。采用ABAQUS软件建立了越层柱结构的有限元模型,基于简化的混凝土损伤塑性模型,进行了静力弹塑性分析(Pushover方法)和弹塑性时程分析,模拟了构件在水平静力荷载和水平地震作用下的性能劣化,主要从构件的层间位移角变化和损伤破坏等级两方面来探讨普通柱与越层柱的抗震性能,对比分析了越层柱结构加强前后的抗震性能。研究表明,越层柱的抗震性能优于普通柱,抗震设计中,若有必要对含有越层柱的结构进行加强处理,建议重点考虑对普通柱构件适当加强。

In seismic design of structures, the skip-floor columns are generally considered as weak parts, which need special enhancementbased on practical experiences. However, there is lack of reliable designing theoretical guidances. In this paper, the ABAQUS was adopted to set up finite element models of skip-floor structures. A series of pushover analyses and nonlinear time history analyses were carried out based on the damaged plasticity model of ABAQUS. The performance degradation of members under horizontal loads （or horizontal earthquake action） was simulated. The change of inter-storey drift angle and the level of member damage were both used in investigating the seismic performance of common columns and skip - floor columns. Additionally, the seismic performances of skip-floor structures after strengthening were analyzed. This study shows that, the seismic performances of skip-floor columns were usually better than thoes of common columns. To properly strengthen structures with skip-floor columns, appropriatestrengtheningschemes of common column members were recommended.