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对4根外套圆钢管自密实混凝土加固钢筋混凝土方柱试件进行偏心受压试验,试验结果表明:圆钢管混凝土加固方柱的破坏形态为弯曲型破坏,其承载力在达到极限以后能维持在一个相对高的荷载值,具有良好的延性,并且随着偏心率的增加,加固柱挠度增大,承载力降低。采用有限元软件ABAQUS对加固柱进行计算,并将有限元计算的承载力、荷载-跨中挠度曲线和荷载-应变曲线与试验结果进行对比,对比结果表明有限元计算结果与试验结果吻合良好。在此基础上,分析了后浇混凝土强度、钢管壁厚、偏心距对加固柱偏压性能的影响,并得到加固柱的轴力-弯矩相关曲线,可用于计算任意偏心距下加固柱的受压受弯承载力。
The eccentric compression test was conducted on reinforced concrete square column specimens reinforced by four concrete round steel tubes reinforced with compact concrete. The test results show that the failure mode of square columns reinforced with round steel tube concrete is a bending failure, and the bearing capacity can be maintained after reaching the limit. A relatively high load value has good ductility, and as the eccentricity increases, the deflection of the reinforced column increases and the bearing capacity decreases. The finite element software ABAQUS was used to calculate the reinforced columns, and the finite element calculations of the bearing capacity, load-transversal deflection curve and load-strain curve were compared with the test results. The comparison results show that the finite element calculation results are in good agreement with the test results. On this basis, the influence of post-concrete concrete strength, steel tube wall thickness and eccentricity on the bias performance of the reinforced column was analyzed, and the axial force-bending moment correlation curve of the reinforced column was obtained, which can be used to calculate the reinforcement column under any eccentricity. Pressure bearing capacity under bending.