摘要
为研究钢管混凝土组合桥墩的抗震性能,完成了8个剪跨比λ=3.0方形截面桥墩试件的低周反复加载试验。基于试件的破坏特征及荷载-位移滞回曲线,分析了内置核心钢管对钢筋混凝土桥墩抗震性能的改善作用,讨论了轴压比、配箍率、纵筋率和钢管埋置长度对组合桥墩抗震性能的影响。结果表明:在墩身内埋置核心钢管可避免桥墩发生竖向压溃和弯剪破坏,同时提高试件的承载力、变形和耗能能力,并减小卸载后的残余位移;轴压比大的组合桥墩试件承载力高、耗能能力强,但变形能力差且残余位移大;随着配箍率或纵筋率的增加,滞回曲线的饱满度变好,变形和耗能能力得到提高;核心钢管在墩身内的埋置长度是决定组合桥墩破坏形态和抗震性能的重要因素,随着钢管埋置长度的增加,组合桥墩试件的破坏形态由剪切型转化为弯曲型,其各项抗震性能指标随之得到改善。
To investigate the seismic behavior of steel tube reinforced concrete(STRC)bridge column,eight square column specimens with a shear span ratio of 3.0 were tested under simulated seismic loading conditions.Based on the observed failure patterns and the obtained force-displacement hysteretic curves,the effectiveness of core steel tube in improving the seismic resistance of reinforced concrete(RC)bridge column is evaluated.In addition,the effects of axial load ratio,stirrup ratio,longitudinal steel ratio,and core steel tube embedment length on the seismic behavior of STRC bridge column are also examined.Test results demonstrate that accompany by eliminating the combined failure mode of vertical crushing and flexural-shear in the RC counterpart,incorporating a core steel tube in the column can enhance the column lateral strength,deformability,energy dissipation,and self-centering capacity.Despite a larger lateral strength and a higher energy dissipation,the STRC column that sustained a higher axial load ratio exhibited relatively poor ductility and self-centering capacity.With the increase of stirrup ratio or longitudinal steel ratio,the hysteretic curvesof STRC bridge column became plumper,and the deformability and energy dissipation capacity were also improved.Core steel tube embedment length is of an essential structural parameter in determining the failure mode and therefore the seismic behavior of STRC bridgecolumn,as thisvariable increased,each seismic performance index of STRC bridge column was significantlyimproved because of the change of failure mode from brittle shear to ductile flexure.
作者
邱文亮
田甜
张哲
QIU Wenliang;TIAN Tian;ZHANG Zhe(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第17期156-164,183,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(51178080)
关键词
钢-混凝土组合桥墩
抗震性能
拟静力试验
破坏形态
滞回曲线
steel-concrete composite bridge column
seismic behavior
pseudo-static test
failure mode
hysteretic curves
