不同层厚钢纤维再生混凝土梁抗裂性能研究

发布时间：2018-01-07 23:31

本文关键词：不同层厚钢纤维再生混凝土梁抗裂性能研究　出处：《建筑科学》2017年11期 　论文类型：期刊论文

【摘要】：本文通过试验对比分析钢纤维混凝土不同层厚对层布式钢纤维再生混凝土梁的开裂荷载和极限荷载、破坏形态、荷载-应变曲线关系、挠度及最大裂缝宽度等性能的影响。试验结果表明:随着钢纤维混凝土层厚的增加梁的初裂荷载值先逐渐增大、后减小,其中在SF50组梁得到最大值。钢纤维的掺入对梁的承载力提高幅度不大,但可以延缓裂缝的出现,提高梁的延性和刚度。不同层厚钢纤维再生混凝土梁整体的应变沿梁高分布符合钢筋钢纤维混凝土叠合梁计算模型。随着钢纤维层厚的增加,破坏后的最大裂缝宽度相应变小。因此可知在再生混凝土梁的受拉区掺钢纤维能有效地提高抗裂性能,同时降低钢纤维使用量,改善混凝土性能。
[Abstract]:In this paper, the cracking load, ultimate load, failure form and load-strain curve of steel fiber reinforced concrete (SFRC) beams with different thickness of steel fiber reinforced concrete (SFRC) are compared and analyzed. The experimental results show that with the increase of the thickness of steel fiber reinforced concrete (SFRC) layer, the initial crack load value of the beam increases at first and then decreases. The maximum value was obtained in the SF50 group of beams. The strength of the beams was not improved by the addition of steel fiber, but it could delay the appearance of cracks. Improving the ductility and stiffness of the beam. The strain distribution along the beam height of the regenerated concrete beam with different thickness of steel fiber accords with the calculation model of reinforced steel fiber reinforced concrete composite beam. The thickness of the steel fiber layer increases with the increase of the thickness of the steel fiber layer. The maximum crack width after failure is reduced accordingly. Therefore, it is known that the tensile zone of recycled concrete beams with steel fiber can effectively improve the crack resistance, reduce the amount of steel fiber, and improve the performance of concrete.
【作者单位】：延边大学工学院结构工程学科;
【分类号】：TU37
【正文快照】： 0引言近年来,随着建筑物的拆除与重建,建筑垃圾之一的废弃混凝土对环境造成的负面影响和循环利用问题已逐渐被人关注。越来越多的人研究将废弃混凝土回收再加工成再生骨料取代天然骨料制成再生混凝土,其研究结果表明:再生混凝土的抗裂性能略低于普通混凝土,影响到再生混凝土的

【相似文献】