对角斜筋小跨高比纤维增强混凝土连梁抗震性能试验研究

为满足小跨高比连梁承载力、延性及耗能的要求，同时避免由于钢筋密集导致的施工困难，采用纤维增强混凝土（FRC）代替普通混凝土作为连梁基体，完成了4个对角斜筋小跨高比FRC连梁试件与1个混凝土连梁对比试件的拟静力试验，分析其破坏过程、破坏形态、承载能力、变形能力和耗能能力等。分析结果表明：FRC可提高连梁的承载力、延性和耗能能力；对角斜筋FRC连梁在主斜裂缝出现前，已具有很高的受剪承载力和变形能力以及良好的抗损伤能力，能够满足强震下的承载力和变形需求，强震后无需修复或稍加修复即可继续使用。

Experimental research on seismic behavior of diagonally reinforced FRC coupling beams with small span-to-depth ratio

In order to make the coupling beam with small span-to-depth ratio meet the requirements in terms of bearing capacity, ductility and energy absorption, the fiber reinforced concrete (FRC) which shows excellent uniaxial tensile strain-hardening properties, cracks control ability and energy dissipation was introduced to cast the beam. The four diagonally reinforced FRC coupling beam specimens with small span-to-depth ratio and one diagonally reinforced common concrete beam were tested under reversed cyclic lateral loading. The specimens’ failure process, failure modes, bearing capacity, deformation capacity and energy dissipation were studied. The results show that FRC can increase the bearing capacity, ductility and energy dissipation of the coupling beams, and the FRC coupling beams has a high shear capacity and deformation capacity, as well as good resistance to damage before the main diagonal cracks form, which can meet the needs of the bearing capacity and deformation under strong earthquakes and can continue to use without repair or with a little repair.