超高性能混凝土混凝土组合梁抗剪承载力计算方法

Shear Resistance of Ultra-High Performance Concrete-Concrete CompositeBeam

摘要:

基于极限平衡理论，并考虑尺寸效应，采用简化的混凝土破坏准则和超高性能混凝土（UHPC）层破坏理论得到了超高性能混凝土混凝土（UHPCNC）矩形截面组合梁斜截面抗剪承载能力计算方法.设计了相应的组合梁抗剪试验.试验数据与理论计算结果的对比分析表明,该计算方法既能准确计算组合梁的抗剪承载力，又能有效反映UHPC层、UHPC层内配筋、尺寸效应等各个参数对于UHPCNC组合梁抗剪承载力的影响.试验结果反映出UHPC层可以大幅提高整体结构的抗剪承载力和延性.

Abstract:

Based on the ultimate equilibrium theory, the size effect, simplified concrete failure criterion, and failure condition of ultra-high performance concrete (UHPC) overlay were considered, and the calculation method of the UHPC-NC ultimate shear resistance was proposed. A shear resistance test was conducted. The on-site measurement and data analysis indicate that this calculation method not only accurately predicts the shear resistance, but also the shows the influence of UHPC overlay, the reinforcement in UHPC overlay, and size effect. The result also shows that the UHPC overlay could improve the ultimate shear resistance and ductility of the overall structure.