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为研究掺入一定量粉煤灰的圆钢管约束钢筋混凝土轴压短柱的承载力,进行了12个试件在单调荷载作用下的试验研究,试验主要参数为钢管径厚比(D/t=55,73和110)和混凝土中粉煤灰的取代率(0,10%,30%和50%),考察了该类短柱的破坏模式、极限承载力、延性以及横向变形系数等,分析了各试验参数对其受力性能的影响规律。试验结果表明,试件破坏时钢管发生撕裂或向外凸曲破坏,核心混凝土发生剪切破坏,纵向钢筋受压鼓曲。径厚比和粉煤灰取代率对试件承载力和延性的影响均较显著,对试件破坏模式的影响不大。钢管对核心混凝土的约束作用在峰值荷载后最为充分。综合考虑破坏模式、承载力和延性等因素,建议实际工程中该类构件的粉煤灰取代率应小于30%,钢管径厚比应不大于100为宜。
In order to study the bearing capacity of CFST-confined RC columns with a certain amount of fly ash, 12 specimens under monotonic loading were investigated. The main parameters of the test were the ratio of D / t = 55, 73 and 110) and fly ash replacement rate (0, 10%, 30% and 50%) in concrete, the failure mode, ultimate bearing capacity, ductility and transverse deformation coefficient of the short columns were investigated. The influence of each test parameter on the force performance was analyzed. The test results show that when the specimen is damaged, the steel tube is torn or bent outwardly, the core concrete is sheared and damaged, and the longitudinal reinforcement is compressed and distorted. The effects of diameter-thickness ratio and fly-ash replacement rate on the bearing capacity and ductility of the specimens are all significant, which have little effect on the failure modes of the specimens. The restraint effect of steel pipe on core concrete is the most adequate after peak load. Considering the failure mode, bearing capacity and ductility and other factors, it is recommended that the replacement ratio of fly ash of such components should be less than 30% in practical engineering, and the diameter-thickness ratio of steel should not be more than 100.