海洋环境下混合配筋桥墩时变抗震性能研究
Research of the time-dependent seismic performance of the hybrid reinforced concrete bridge column in marine environment
徐芬 1苑溦 1林军 1张建林2
作者信息
- 1. 江苏开放大学建筑工程学院,江苏南京 210036
- 2. 中国建筑科学研究院有限公司,北京10013
- 折叠
摘要
以截面配置玻璃纤维增强复合材料(Glass Fiber Reinforced Polymer,GFRP)筋和普通热轧带肋钢筋的桥墩为研究对象,分析混配比例增长对其抗震性能的影响规律,探究其在海洋环境下时变抗震性能演化特征.首先,基于Arrhenius模型和加速腐蚀试验数据,计算全服役期内GFRP筋时变抗拉强度,基于有限差分法和经验公式,计算普通热轧带肋钢筋时变截面面积和时变屈服强度;其次,基于OpenSees有限元分析软件建立混合配筋桥墩时变有限元模型,模型中将应变渗透效应、GFRP筋断裂、材料性能退化均考虑在内;最后,通过滞回分析,探究桥墩各性能指标随服役时间增加的变化规律,掌握混配比例变化对桥墩抗震性能的影响特征.结果表明:混配比增加,可提高桥墩峰值承载力、桥墩屈服后刚度、峰值位移和极限位移,减小残余位移;服役时间增加,混合配筋桥墩残余位移和累积耗能可能出现先增加后减小的现象.
Abstract
Focus on the bridge column with glass fiber reinforced polymer(GFRP)bars and ordinary hot-rolled ribbed steel bars in cross section,the influence of increase of hybrid ratio on structural seismic performance is analyzed,and structural time-dependent seismic performance evolution characteristic in marine environment is investigated.First,based on the Arrhenius model and accelerated corrosion test data,GFRP bar's time-dependent tensile strength is obtained.Based on finite difference method and empirical formula,area and yield strength deterioration of hot-rolled ribbed steel bars are calculated.Second,the finite element models considering strain penetration,GFRP bar rupture,material deterioration are built by software OpenSees.At last,the performance index reflecting structural seismic performance are calculated to investigate the influence of service time and hybrid ratio.The results indicate that the increase of hybrid ratio can increase the peak load,post-yield stiffness ratio,peak displacement and ultimate displacement of the bridge column,and decrease residual displacement.In addition,the increase of service time has the possibility of inducing the phenomenon of increase at first but then decrease,for the performance index of residual displacement and energy dissipation.
关键词
海洋环境/混合配筋桥墩/混配比/性能退化模型/时变抗震性能Key words
marine environment/hybrid reinforced concrete bridge column/hybrid ratio/performance deterioration model/time-dependent seismic performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据