型钢混凝土柱在拉-弯-剪复合受力下的延性分析

为研究型钢混凝土柱在拉-弯-剪复合受力下的抗震性能,对13根试件进行了低周反复荷载试验,观察型钢混凝土柱的破坏形态,研究其滞回曲线特性和延性特征,主要分析了剪跨比、轴拉比和偏心距对柱延性的影响,并给出了柱的极限位移角限值。研究结果表明:型钢混凝土柱主要发生弯剪破坏;滞回曲线大多呈梭形,滞回环较为饱满;柱位移延性系数均大于3,表现出较好的抗震性能;延性系数随轴拉比和偏心距的增大有所下降,但随剪跨比的增大而增大;柱极限位移角均值大约为1/10,表现出较强的位移变形能力。

Ductility analysis of steel reinforced concrete columns under combined forces of tension-bending-shear

In order to study the seismic behavior of steel reinforced concrete(SRC)columns under combined forces of tension-bendingshear,13 specimens were tested under low cycle cyclic loading.The failure patterns of SRC columns were observed,the hysteretic curve and ductility characteristics of SRC columns were studied.The influence of shear-span ratio,axial ratio and eccentricity on the ductility of the column was analyzed,and the limit value of the ultimate displacement angle of the column was given.The results show that the shear-bending failure is the main failure pattern of steel reinforced concrete(SRC)columns,the load-dispalcement hysteretic loops of most specimens are in plump spindle-shape,the displacement ductility coefficient of the columns is more than 3,which shows the good seismic performance.The ductility coefficient decreases with the increase of axial ratio and eccentricity,but increases with the increase of shear-span ratio.The ultimate displacement angle of column is about 1/10,showing the good lateral deformation capacity.