钢管海砂再生混凝土轴压性能试验与分析

摘要

以再生粗骨料取代率和海砂中的Cl-含量为主要参数,完成了18个钢管海砂再生混凝土轴压试验,分析了再生粗骨料取代率、海砂中的Cl-含量对试件破坏特征和受力变形的影响.结果表明:钢管海砂再生混凝土受力过程与普通钢管混凝土相似,包含弹性、弹塑性和破坏3个阶段,其主要破坏模式为斜剪破坏;试件峰值荷载随着再生粗骨科取代率和海砂中的Cl-含量的增加而略有降低;峰值应变随着再生粗骨料取代率的增加而增大,随着Cl-含量的增加先增大后减小.同时,对比分析了不同规范的峰值荷载公式计算值与试验值的差异,并根据试验数据对钢管海砂再生混凝土轴压应力-应变全曲线计算模型进行了拟合.%A compression test for the 18 sea-sand recycled concrete filled steel tube(SSRCFS) columns was conducted.The main parameters were recycled coarse aggregate(RCA) replacement percentage and seasand chloride ion content(CIC).The effects of RCA replacement percentage and CIC on the failure pattern of specimens and the load-deformation relationships were investigated.Results show that the loading processes of SSRCFS include elastic,plastic and faiture stages,which is similar to those of ordinary concrete filled steel tube(CFST) specimens.The main failure pattern of specimen is diagonal shear failure.It is also indicated that the peak load decreases slightly with the increase of the RCA replacement percentage and sea-sand CIC.The peak strain increases with the increase of RCA replacement percentage,while it increases first and then decreases with the increase of CIC.Finally,the comparison between the tested peak load and the calculated value by the codes is completed,axial stress-strain curves of SSRCFS are proposed based on the test data.