基于软化拉-压杆模型钢骨超高强混凝土框架节点抗剪承载力计算

钢骨超高强混凝土框架节点是一种新型组合结构.为计算钢骨超高强混凝土框架节点的抗剪承载力,基于钢筋混凝土框架节点软化拉-压杆模型,以钢骨和超高强混凝土为压杆,以钢骨、纵筋、箍筋为拉杆,建立了钢骨超高强混凝土框架节点软化拉-压杆模型,进行了框架节点抗剪承载力计算,并与试验值进行了比较,分析了轴压比和配箍率对计算值的影响.结果表明,抗剪承载力试验值与计算值的比在1.2左右,吻合较好,且计算值偏于安全;随着轴压比的增大,计算值增大;随着配箍率的增大,计算值亦增大.所提出的钢骨超高强混凝土框架节点软化拉-压杆模型很好地反映出轴压比和配箍率对抗剪承载力的影响.

Shear strength calculation of steel reinforced ultra-high strength concrete frame connection based on softened strut-and-tie model

Steel reinforced ultra-high strength concrete frame connection is a new type of composite structure. In order to calculate the shear strength of steel reinforced ultra-high strength concrete frame connection, a softened strut-and-tie model is proposed based on the reinforced concrete frame connection. In this model, steel and ultra-high strength concrete are considered as strut, and steel, longitudinal reinforcement, loop reinforcement are considered as tie. Shear strength of steel reinforced ultra-high strength concrete frame connection is calculated, the calculated values are compared with test values, and influences of axial compression ratio and stirrup ratio on the calculated values of shear strength are analyzed. The experimental results show that the ratios between test values and calculated values are approximately 1.2, and the calculated values agree well with test values and are reliable. The calculated values increase with axial compression ratio increment or with stirrup ratio increment. The proposed softened strut-and-tie model can reflect the influences of axial compression ratio and stirrup ratio on shear strength.