全轻页岩陶粒-纤维-钢筋混凝土梁的快速加载试验研究

Rapid loading test of all-lightweight shale ceramsite-fiber-reinforced concrete beam

为研究全轻页岩陶粒纤维钢筋混凝土梁的动力特性以及力学性能,对掺加纤维种类分别为钢纤维、碳纳米管纤维、聚丙烯纤维的强度等级为LC40的全轻页岩陶粒纤维钢筋混凝土梁进行快速加载试验,并与其静载试验进行对比。结果表明:在受到冲击作用时,纤维的加入能阻止裂纹的扩展,减少冲击作用对试件的破坏程度,提高试件的抗裂性及试验梁的屈服荷载、极限荷载和抗冲击性能。其中,掺入钢纤维的试验梁提高效果较为明显,且全轻页岩陶粒纤维钢筋混凝土梁的承载能力比静载时的大,而且裂缝宽度变小,裂缝间距变窄。

In order to study the dynamic characteristics and mechanical properties of full-thickness shale ceramic fiber reinforced concrete beams, The fast loading test of the full-thickness shale ceramic fiber reinforced concrete beams with the fiber grade of steel fiber, carbon nanotube fiber and polypropylene fiber with LC40 grade strength was compared with that of static load test. The results show that the addition of fiber can prevent expansion of the crack, reduce the damage degree of the specimen and improve the crack resistance of the specimen and the yield load, ultimate load and impact resistance of the test beam. Among them, the effect of reinforced steel beam is more obvious, and the bearing capacity of full-thickness shale ceramic fiber reinforced concrete beam is larger than that of static load, and the crack width becomes smaller and the crack spacing becomes narrower.