【摘要】 通过试验,研究在较高轴压比条件下钢骨超高强混凝土柱的抗震性能。制作了13根剪跨比为2.75的钢骨超高强混凝土柱试件,其强度为94.9～105.4 MPa。设计时主要考虑轴压比、配箍率等因素对试件抗震性能的影响。在低周反复周期荷载作用下,试件的破坏形态是以弯曲破坏为主的弯剪破坏。根据采集的荷载、位移等数据,绘制出试件的滞回曲线和骨架曲线,并据此计算了试件的位移延性系数。试验表明,随着轴压比提高,试件的延性表现得越来越差;而较高配箍率可在一定程度上使延性得到改善。根据试验结果,提出了满足一定抗震位移延性要求的钢骨超高强混凝土柱轴压比限值和柱箍筋加密区最小配箍率的建议值,从而为工程设计提供参考。更多还原

【Abstract】 The seismic performance of steel reinforced super-high-strength concrete columns(SRSHC)is studied through a series of experiments.Thirteen specimens with concrete strength ranging 94.9～105.4MPa and a shear-span ratio of 2.75 were manufactured.The main experimental variables affecting the seismic performance of specimens were axial pressure ratio and stirrup reinforcement ratio.The columns subjected to low cyclic reversal lateral loads fail mainly in the flexural-shear mode failure.Shear force-displacement hysteretic curves and skeleton curves were drawn.Coefficient of the specimen displacement ductility was calculated.Experimental results indicate that ductility decreases with increase in axial pressure ratio,and increases with stirrup reinforcement ratio.Limit values of axial pressure ratio and minimum hoop reinforcement ratio of columns are proposed to satisfy definite ductility requirement.The suggested values provide a reference for engineering application and for the amendment of the current Chinese design code of steel reinforced concrete composite structures.更多还原