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为了解决异形柱框架节点的薄弱问题,对核心区应用钢纤维增强的异形柱框架中节点与同条件下未用钢纤维增强的异形柱框架中节点进行拟静力试验研究,对比分析异形柱框架中节点试件的破坏特征、中节点核心区的箍筋应变、混凝土应变及异形柱框架中节点的受剪性能,研究钢纤维增强的异形柱框架节点薄弱部位受力性能。研究结果表明:应用钢纤维增强的异形柱框架中节点试件的破坏特征得到改善;在异形柱框架节点核心区掺入钢纤维可以降低加载初期中节点核心区的箍筋应变,中节点腹板在平行于剪力方向的箍筋应变大于腹板垂直剪力方向的箍筋应变及翼缘处的箍筋应变;在中节点核心区掺入钢纤维可提高腹板混凝土的主拉应变和异形柱节点受剪承载力。
In order to solve the problem of the weakness of the special-shaped column frame joints, the quasi-static tests on the nodes in the special-shaped column frame with steel fiber reinforcement in the core area and those in the special-shaped column frame not reinforced with steel fiber under the same conditions were carried out. The failure characteristics of the mid-node specimen, the stirrup strain in the mid-node core region, the concrete strain and the shear behavior of the joints in the special-shaped column frame were studied. The results show that the failure characteristics of the joint specimens in the special-shaped columns strengthened with steel fiber are improved. The steel fiber in the core of the special-shaped columns can reduce the strain of the stirrups in the mid- The strain of stirrup parallel to the shear direction is greater than that of the stirrups in the direction of vertical shear force of the web and the strain of the stirrups in the flange. The incorporation of steel fiber in the core of the joint increases the principal tensile strain and profile of the web concrete Column node shear capacity.