通过采用低周反复加载的方法，对6个不同钢纤维体积率的钢筋钢纤维混凝土连梁和6个不同钢纤维混凝土强度等级的钢筋钢纤维混凝土连梁进行了试验研究。分析了钢纤维体积率和钢纤维混凝土强度等级对钢筋钢纤维混凝土连梁开裂荷载、裂缝发展和破坏形态等的影响。结果表明，钢纤维能够约束连梁的裂缝发展，改善连梁的破坏形态，明显提高连梁的开裂荷载，当钢纤维体积率从0增加到2．5％时，开裂荷载最大增幅为33．3％。%Tests on twelve steel fiber reinforced concrete coupling beams were conducted under low frequency cyclic loading, six of the beams with different volume fractions of steel fibers and the other with different steel fiber concrete strengths. The effects of steel fiber volume fractions and concrete strengths on crack load, crack development and failure patterns of the steel fiber reinforced concrete coupling beams were analyzed. The results show that steel fibers can restrain the crack development, improve the failure patterns and increase the crack load. When the steel fiber volume fractions increase to 2.5%, the maximum increment of crack load is 33.3%.
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