外包型钢加固箍筋锈蚀混凝土柱恢复力模型研究  

Restoring force model of corroded stirrup concrete columns reinforced with epiboly profiled steel

作　　者：李强[1,2] 董嘉辉[1] 常迪文 金宇琨 LI Qiang;DONG Jiahui;CHANG Diwen;JIN Yukun(College of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710000,China;Institute of Building Structure Inspection and Reinforcement,Xi’an University of Science and Technology,Xi’an 710000,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710000 [2]西安科技大学建筑结构检测与加固研究所,西安710000

出　　处：《振动与冲击》2023年第17期284-293,共10页Journal of Vibration and Shock

基　　金：国家青年科学基金项目(51408483);陕西省自然科学基础研究计划面上项目(2017JM5045)。

摘　　要：为研究外包型钢加固后箍筋锈蚀混凝土柱的恢复力模型,对9根不同箍筋锈蚀率、体积配箍率的各混凝土柱进行通电锈蚀,锈蚀完成后加固,进而进行低周往复荷载试验。对各试验试件的骨架曲线及滞回曲线进行分析。在完好试件恢复力模型特征参数计算的基础上,对数据进行拟合回归,给出了外包型钢加固后箍筋锈蚀混凝土柱的退化三线型恢复力模型,并提出了不同因素作用下特征参数的计算公式。结果表明:箍筋锈蚀柱经外包型钢加固后各抗震性能指标有显著提升,破坏特征点明显滞后于完好试件,且以剪切破坏为主。通过对比分析,所得模型与试验结果吻合较好,能很好地反映外包型钢加固柱的滞回特性,为此类柱恢复力模型的计算提供参考。Here,to study the restoring force model of corroded stirrup concrete columns reinforced with epiboly profiled steel,firstly,9 concrete columns with different stirrup corrosion rates and volumetric reinforcement ratios were subjected to electrical corrosion.After corrosion was completed,reinforcement was performed for these columns,and then low cycle reciprocating load tests were conducted for them.Secondly,skeleton curves and hysteresis curves of these specimens were analyzed.On the basis of calculating characteristic parameters of intact specimen’s restoring force model,test data were fitted and regressed.Finally,a degenerated trilinear restoring force model for corroded stirrup concrete columns reinforced with epiboly profiled steel was deduced,and formulas for calculating characteristic parameters under different factors were proposed.The results showed that various aseismic performance indexes of corroded stirrup concrete column are significantly improved after being reinforced with epiboly profiled steel,and failure characteristic points are obviously lagging behind intact specimen’s,shear failure is the main failure mode;through contrastive analysis,the obtained model agrees better with test results,it can better reflect hysteresis characteristics of columns after being reinforced with epiboly profiled steel;the study results provide a reference for restoring force model calculation of this type columns.

关 键 词：外包型钢加固 箍筋锈蚀 恢复力模型 低周往复荷载试验 

分 类 号：TU375[建筑科学—结构工程] TU375.3