双相不锈钢套管加固锈蚀RC短柱轴压力学性能试验研究  

Experiment on the Axial Compressive Behavior of Corroded RC Stub Columns Strengthened with Duplex Stainless Steel Jackets

作　　者：张帅 高剑平[1] 应宗豪 曹忠民[1] ZHANG Shuai;GAO Jianping;YING Zonghao;CAO Zhongmin(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《建筑钢结构进展》2024年第12期24-34,共11页Progress in Steel Building Structures

基　　金：国家自然科学基金(52268025)。

摘　　要：钢筋混凝土(RC)桥柱的锈蚀问题直接危及桥梁的安全性和使用寿命,必须同时采取腐蚀防护和加固措施。提出采用双相不锈钢套管加固锈蚀RC桥柱,为研究其轴心受压力学性能,对10根双相不锈钢套管加固锈蚀RC短柱、2根低碳钢套管加固锈蚀RC短柱和4根未加固RC短柱对比试件进行了轴心受压试验,获得了试件的破坏形态和荷载-位移曲线。在此基础上分析了钢筋锈蚀率、钢套管壁厚、钢套管材质和填充混凝土类型(自密实自应力混凝土和自密实混凝土)对试件轴压力学性能的影响规律,并推导了双相不锈钢套管加固锈蚀RC短柱轴心受压承载力计算公式,计算结果与试验结果吻合良好,可为实际工程应用和后续研究提供参考。研究结果表明,加固试件呈现出两种破坏形态:(1)双相不锈钢套管中上部或中下部局部鼓曲破坏;(2)双相不锈钢套管中上部局部鼓曲的同时发生局部屈曲失稳破坏;加固柱的荷载-位移曲线、荷载-应变曲线和承载力受双相不锈钢套管壁厚和钢套管材质影响较大,而受钢筋锈蚀率和填充混凝土类型影响很小;双相不锈钢套管可以非常显著地提高锈蚀RC柱的承载力和变形能力,并且承载力随套管壁厚的增大而增加。在其他条件相同的情况下,双相不锈钢套管加固试件比低碳钢套管加固试件的承载力提高幅度更大。Corrosion of reinforced concrete(RC)bridge columns poses a significant threat to the safety and service life of bridges,therefore,corrosion protection and strengthening must be carried out simultaneously.This paper proposed using duplex stainless steel jackets to strengthen corroded RC bridge columns.To investigate the axial compressive behavior of these strengthened columns,axial compression tests were conducted on 10 corroded RC stub columns strengthened with duplex stainless steel jackets,2 corroded RC stub columns strengthened with low-carbon steel jackets and 4 unstrengthened RC stub columns for comparison.The failure modes and load-displacement curves of the specimens were obtained.On this basis,the effects of rebar corrosion rate,steel jacket thickness,steel jacket material and infill concrete type(self-compacting self-stressing concrete and self-compacting concrete)on the axial compressive behavior of specimens were analyzed.A formula for calculating the axial compressive capacity of corroded RC stub columns strengthened with duplex stainless steel jackets was derived.The predicted results are in good agreement with the test results,which provide a reference for practical engineering applications and future research.The study results indicate that the strengthened specimens exhibited two distinct failure modes:(1)local bulging of duplex stainless steel jacket in the upper or lower region of the specimens,(2)simultaneous local bulging and local buckling failure in the upper region of the specimens.The load-displacement curves,load-strain curves and bearing capacity of strengthened column specimens are greatly affected by the jacket thickness and material,while the rebar corrosion rate and infill concrete type have minimal impact.The bearing capacity and deformation capacity of corroded RC columns can be significantly improved by the duplex stainless steel jackets,and the bearing capacity of strengthened columns increases with the increase of the thickness of duplex stainless steel jackets.Under the same ot

关 键 词：锈蚀RC桥柱 双相不锈钢 套管 加固 轴压力学性能 

分 类 号：TU398.9[建筑科学—结构工程]