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结合武汉市后湖大桥圆端形钢管混凝土塔柱工程实际,制作大尺寸圆端形钢管混凝土试件,开展偏心受压试验研究,分析了圆端形钢管混凝土偏心受压试件的破坏机理、荷载-横向位移曲线、荷载-纵向应变曲线及荷载-环向应变曲线。试验表明,钢管混凝土偏压构件具有良好的受力性能。随着偏心距的增大,承载力不断降低;中截面变形符合平截面假定,中和轴位置随偏心率的增大而不断往荷载作用侧移动;试件破坏时,钢管受压区侧进入塑性状态,受拉区尚处于弹性状态。
Combined with the actual project of the circular end-to-end concrete-filled steel tubular column of Houhu Bridge in Wuhan, a large-diameter circular CFST specimen was made and the eccentric compression test was carried out. The failure mechanism of circular- Load - lateral displacement curve, load - longitudinal strain curve and load - hoop strain curve. Experiments show that the CFST members have good mechanical properties. As the eccentricity increases, the bearing capacity decreases; the deformation of the middle section conforms to the assumption of the flat section, and the position of the neutral axis continues to move toward the load side as the eccentricity increases; when the specimen is damaged, Plastic state, the tension zone is still in a state of elasticity.