The seismic performance of steel reinforced ultra-high-strength concrete columns(SRSHC) with various shear-span ratios(λ) were studied through a series of experiments.The concrete compressive cube strength value of e...The seismic performance of steel reinforced ultra-high-strength concrete columns(SRSHC) with various shear-span ratios(λ) were studied through a series of experiments.The concrete compressive cube strength value of experimental specimens ranged from 92.9 MPa to 108.1 MPa.The main experimental variables affecting seismic performance of specimens were axial load ratio and stirrup reinforcement ratio.The columns(λ=2.75) subjected to low cyclic reversed lateral loads failed mainly in the flexural-shear mode failure and columns(λ≤2.0) subjected to low cyclic reversed lateral loads failed mainly in the 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 axial pressure ratio increasing,and increases with stirrup reinforcement ratio increasing.Limit values of axial pressure ratio and minimum stirrup 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.展开更多
为研究预制UHPC(Ultra High Performance Concrete,UHPC)节段梁间胶接缝在剪切荷载下的力学性能,开展了一组UHPC单键齿胶接缝和七组UHPC多键齿胶接缝抗剪性能试验,考虑键齿数量,键齿形式(高深比),胶层厚度和正应力水平对剪切荷载下UHPC...为研究预制UHPC(Ultra High Performance Concrete,UHPC)节段梁间胶接缝在剪切荷载下的力学性能,开展了一组UHPC单键齿胶接缝和七组UHPC多键齿胶接缝抗剪性能试验,考虑键齿数量,键齿形式(高深比),胶层厚度和正应力水平对剪切荷载下UHPC多键齿胶接缝破坏过程,破坏模式和承载能力的影响。结果表明:UHPC多键齿胶接缝均在极限荷载的0.6~0.7的范围内出现开裂,键齿数量、正应力水平和键齿形式(高深比)对UHPC多键齿胶接缝抗剪性能的影响较大,增加键齿数量,提高正应力水平,采用高深比较大的键齿形式均能在不同程度上提高UHPC多键齿胶接缝的抗剪承载力和延性;胶层厚度对UHPC多键齿胶接缝抗剪性能的提升影响较小;考虑键齿折减效应的计算公式能够较为准确的预测UHPC多键齿胶接缝的抗剪承载力。展开更多
文摘The seismic performance of steel reinforced ultra-high-strength concrete columns(SRSHC) with various shear-span ratios(λ) were studied through a series of experiments.The concrete compressive cube strength value of experimental specimens ranged from 92.9 MPa to 108.1 MPa.The main experimental variables affecting seismic performance of specimens were axial load ratio and stirrup reinforcement ratio.The columns(λ=2.75) subjected to low cyclic reversed lateral loads failed mainly in the flexural-shear mode failure and columns(λ≤2.0) subjected to low cyclic reversed lateral loads failed mainly in the 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 axial pressure ratio increasing,and increases with stirrup reinforcement ratio increasing.Limit values of axial pressure ratio and minimum stirrup 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.
文摘为研究预制UHPC(Ultra High Performance Concrete,UHPC)节段梁间胶接缝在剪切荷载下的力学性能,开展了一组UHPC单键齿胶接缝和七组UHPC多键齿胶接缝抗剪性能试验,考虑键齿数量,键齿形式(高深比),胶层厚度和正应力水平对剪切荷载下UHPC多键齿胶接缝破坏过程,破坏模式和承载能力的影响。结果表明:UHPC多键齿胶接缝均在极限荷载的0.6~0.7的范围内出现开裂,键齿数量、正应力水平和键齿形式(高深比)对UHPC多键齿胶接缝抗剪性能的影响较大,增加键齿数量,提高正应力水平,采用高深比较大的键齿形式均能在不同程度上提高UHPC多键齿胶接缝的抗剪承载力和延性;胶层厚度对UHPC多键齿胶接缝抗剪性能的提升影响较小;考虑键齿折减效应的计算公式能够较为准确的预测UHPC多键齿胶接缝的抗剪承载力。
