基于纤维梁柱单元的钢筋混凝土柱抗震性能分析

摘要

基于OpenSees中的纤维梁柱单元对6根不同工况下钢筋混凝土柱进行了低周反复荷载作用下的有限元分析，对比分析了在配置相同纵筋条件下，不同箍筋强度和不同箍筋间距的各柱试件的承载力和位移延性，研究表明：加密箍筋能够延缓试件承载力退化，增强核心区混凝土所受约束；减小箍筋间距能够显著提高试件承载力、极限位移和延性，但是对屈服位移影响不大；增大箍筋强度能够小幅提升试件承载力，但对试件变形能力影响不大。%Six RC column members with cyclic loading are analyzed based on fiber element with the FEM software OpenSees. The impact of stir-rup strength and spacing on bearing capacity and displacement ductility of the columns with identical bar arrangement are investigated and con-trasted. The analytical results indicated that smaller stirrup spacing could improve the confinement of the core concrete and reduce the degrada-tion of the bearing capacity. It is also beneficial to bearing capacity,ultimate displacement and ductility of the members while have no impact on the yield displacement. Higher stirrup strength could improve the bearing capacity slightly but have on impact on the deformability.