预应力钢纤维混凝土梁斜截面承载力试验和计算方法

根据２５根预应力钢纤维混凝土无腹筋梁和 ２５根预应力钢纤维混凝土配箍筋梁的试验结果，分析 了预应力、剪跨比、钢纤维含量特征值及配箍特征值等变化对预应力钢纤维混凝土梁斜截面破坏形态和斜截面 承载力的影响规律，提出了预应力钢纤维混凝土无腹筋梁和预应力钢纤维混凝土配箍筋梁的斜截面承载力计算 方法。该成果可作为《钢纤维混凝土结构设计与施工规程》增订相应条款的研究基础，并可供实际工程设计应 用参考。

EXPERIMENTAL STUDY ON SHEAR RESISTANCE OF PRESTRESSED STEEL FIBER REINFORCED CONCRETE BEAMS

Results of an experimental study on the shear behavior of 50 prestressed steel fiber reinforced concrete beams, 25 without web reinforcement and 25 with stirrups, are summarized. The effects of the following factors such as the shear- span to depth ratio, the prestressing force, the characteristic value of steel fiber and the characteristic value of stirrups, on the failure modes and the shear resistance of prestressed steel fiber reinforced concrete beams are analyzed. The method for calculating the shear resistance of prestressed steel fiber reinforced concrete beams is proposed. It may be used as a research basis for revising and enlarging the contents of Specification for Design and Construction of Steel Fiber Reinforced Concrete Structures, and may be served as a reference in design of prestressed concrete structures at present.