塑性铰区ECC-CFST组合截面桥墩抗震性能数值分析

Numerical Analysis of Seismic Performance of ECC-CFST Composite Section Bridge Piers in Plastic Hinge Area

通过使用OpenSees有限元软件建立模型,对桥梁工程中既有的钢筋混凝土(Reinforced Concrete)桥墩体系作出改善,研究在塑性铰区使用ECC-CFST组合截面的抗震性能,探究一个合理的管径尺寸使其能够达到良好的抗震性能。研究结果表明:以方形墩身截面边长的1/3~1/2为标准选取的钢管埋入至桥墩的塑性铰区,改进后的RC桥墩体系中各个材料组成部分能够达到较为良好的抗震效果,钢管混凝土能够保持在弹性或者小变形范围内,钢管外侧的ECC也能充分利用其材料性能,实现良好的桥墩抗震韧性效果。

The existing reinforced concrete bridge pier system in bridge engineering is improved by using OpenSees finite element software to establish the model,the seismic performance of ECC-CFST composite section in the plastic hinge area is studied,and a reasonable pipe diameter size is explored to achieve good seismic performance.The research results show that:the steel pipe selected based on the standard of 1/3~1/2 of the cross-sectional length of the square pier body is buried in the plastic hinge area of the bridge pier,the improved RC bridge pier system can achieve good seismic effect in various material components,and the reinforced concrete can maintain within the elastic or small deformation range.The ECC on the outer side of the steel pipe can also fully utilize its material properties,and achieve good seismic toughness of the bridge pier.