地下管沟变形缝抗剪钢筋反复加荷实验研究

为了防止现浇地下管沟的变形缝发生变位,施工时经常在变形缝位置布设钢筋以提高其抗剪能力(抵抗其产生附加内力)。文章就以实验研究地下管沟变形缝处抗剪钢筋的力学性能和抗震延性,通过以抗剪钢筋布置方式、钢筋数量、抗剪钢筋锚入长度为参数,在整体结构缩尺模型上反复加载,得到试件的破坏形态和破坏现象、力-位移曲线及延性系数结果,从而得出试件的极限承载力大小与抗剪钢筋配置数量成正比,抗剪钢筋布置的位置对极限承载力大小没有多大影响,但对延性性能有影响。

In order to prevent the displacement of the deformation joint of the cast-in-place underground pipe ditch,steel bars are often laid at the deformation joint position during construction to improve its shear resistance(to resist the additional internal force).In this paper,the mechanical properties and anti-seismic ductility of shear steel bars at the deformation joints of underground pipe trenches are studied experimentally.By repeatedly loading on the scale model of the whole structure with the arrangement of anti-shear bars,the number of steel bars and the anchor length of anti-shear bars as parameters,the failure shape and phenomenon of the specimen,the force-displacement curve and the ductility coefficient are obtained,and it is concluded that the ultimate bearing capacity of the specimen is proportional to the number of anti-shear bars.The location of the shear reinforcement has little effect on the ultimate bearing capacity,but has an effect on the ductility.