预应力钢纤维混凝土梁斜截面疲劳性能试验研究

RESEARCH ON THE SHEAR FATIGUE BEHAVIOR FOR STEEL FLBER REINFORCED PRESTRESSED CONCRETE BEAMS

根据１０预应力钢纤维混凝土梁疲劳荷载试验结果，分析了钢纤维体积率、长径比和疲劳循环特征、循环次数等因素对预应力钢纤维混凝土梁剪压区混凝土应变、箍筋应变、斜裂缝分布形态与开展宽度以及斜截面抗疲劳破坏性能的影响规律，提出了疲劳荷载作用下预应力钢纤维混凝土梁斜载面裂缝宽度和耐疲劳能力的验算方法。

A fatigue test of ten Pieces of steel fiber reinforced prestressed concrete beams is conducted. Some results show that there many factors effect on the following items. The items are the strains in the shear - compression zone, the strainsof stirrups, the crack patterns, the diagonal crack width, and the fatigue failure of a steel fiber reinforced prestressed concrete beam. These factors are the fiber volume fraction, the fiber aspect ratio, the fatigue cyclic characteristic, and the cyclic number. Formulas for calculating the diagonal crack width and the fatigue capacity are Proposed in the paper.