为研究拉弯剪复合受力型钢混凝土柱的抗震性能，以剪跨比、轴拉比、偏心距为变化参数，设计13个型钢混凝土柱试件进行低周反复试验，观察试件的破坏过程与破坏形态，得到了试件的荷载-位移曲线以及试件的特征点参数。基于试验数据，详细分析了拉弯剪复合受力型钢混凝土柱的承载力、位移延性、能量耗散、刚度退化等抗震性能以及损伤指标。结果表明：型钢混凝土柱的主要破坏形态为弯曲破坏、拉弯破坏以及弯剪破坏；其滞回曲线饱满，位移延性系数均超过6.0；破坏时损伤指数在0.804～0.963之间；随剪跨比的增大，各试件延性及耗能能力不断增加，极限承载力下降明显，损伤指标最大减小11.55%；随轴拉比以及偏心距的增大，各试件极限承载力逐渐降低，延性及耗能能力逐渐减小，损伤指标不断增大。总体上看，在拉弯剪复合受力状态下型钢混凝土受拉柱具有较好的抗震性能，可将其运用在实际工程中。
Abstract
In order to investigate the seismic performance of steel reinforced concrete columns under tension-flexure-shear actions, a total of 13 specimens with varying parameters of shear span ratios, eccentricities and axial pull ratios were designed and tested under reversed cyclic loading.The failure process and pattern were observed.The load-displacement hysteretic loops and characteristic values were obtained.Based on the experimental data, bearing capacity, displacement ductility, energy dissipation, stiffness degradation and damage quantitative were analyzed.The experimental results demonstrate that the failure patterns of specimens present as bending failure, tension-bending failure and tension-bending-shear failure.The hysteretic curves were approximated as a plump spindle shape.The damage index of all specimens is between 0.804-0.963 at the state of failure.With the increment of shear span ratio, ductility and energy dissipation capacity increases, the ultimate bearing capacity decreases significantly and the damage index decreases by 11.55%. With the increment of the axial pull ratios and eccentricity, the ultimate bearing capacity increases, ductility and energy dissipation capacity decreases and the damage index increases.It is concluded that the steel reinforced concrete columns under tension-flexure-shear action have good seismic performance.
关键词
拉-弯-剪复合作用下型钢混凝土柱 /
柱剪跨比 /
轴拉比 /
偏心距
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Key words
steel reinforced concrete columns subjected to constant tension and cycled flexure-shear /
shear span ratios /
axial pull ratios /
eccentricity
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