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塑钢纤维轻骨料混凝土梁受弯性能试验研究
牛建刚, 梁剑, 焦孟友
内蒙古科技大学 土木工程学院, 包头 014010
摘要:
试验制作了塑钢纤维掺量分别为0、3、6、9 kg/m3的4根轻骨料混凝土梁,研究塑钢纤维对轻骨料混凝土梁受弯性能的影响。结果表明:塑钢纤维有效地延缓了梁裂缝的发展,减小了最大裂缝宽度,使裂缝变得多而密;梁的开裂弯矩和极限弯矩随塑钢纤维掺量的增加均得到不同程度的提高,LC-9梁的开裂弯矩和极限弯矩相较于LC-0梁分别提高了72%和8.43%;纤维掺量增加,梁的屈服挠度减小,极限挠度增大,挠度延性系数μf增大,最大提高了92.23%;塑钢纤维使梁的相对受压区高度略微增大,持荷能力提高,降低了受拉钢筋应变,延缓了钢筋的屈服时间。
关键词:  塑钢纤维  轻骨料混凝土  受弯性能  延性
DOI:10.11835/j.issn.2096-6717.2019.099
分类号:TU528.2
基金项目:国家自然科学基金(51368042);内蒙古自治区青年科技英才支持计划(No.NJYT-18-A06)
Experimental study on flexural behavior of plastic steel fiber lightweight aggregate concrete beams
Niu Jiangang, Liang Jian, Jiao Mengyou
School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
Abstract:
Four lightweight aggregate concrete beams with plastic steel fiber content of 0kg/m3, 3kg/m3, 6kg/m3, 9kg/m3 were produced, to study the effect of plastic steel fiber on the flexural properties of lightweight aggregate concrete beams. The results show that plastic steel fiber effectively delay the development of beam cracks and reduce the maximum crack width and make the cracks much denser. The cracking moment and the ultimate moment increase with the proportion of plastic steel fiber, the cracking moment and ultimate moment of the LC-9 beam are increased by 72% and 8.43%, respectively, compared with the LC-0 beam. With the fiber content increases, the yield deflection of the beam increases and the ultimate deflection increases. Meanwhile the deflection ductility coefficient μf increases, with a maximum increase of 92.23%. The plastic steel fiber reduces the height of the relative compression zone of the beam, the load-holding capacity is improved, and the strain of steel bar is reduced, and the yield time of the steel bar is delayed.
Key words:  plastic steel fiber  lightweight aggregate concrete  flexural behavior  ductility
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