In order to study the influence of cotton straw fiber on the shear performance of ceramsite foamed concrete,the experi-ment was performed by using double-sided direct shear method to evaluate the shear performance of fiber reinforced ceramsite foamed concrete.At the same fiber content and fiber length conditions,cotton straw fiber,glass fiber and polypropylene fiber re-inforcement effect on shear strength of ceramsite foamed concrete were compared.Additionally,effects of cotton straw fiber con-tent and fiber length on shear strength of ceramsite foamed concrete were also evaluated.Under the 0.2% fiber content and 6-10 mm fiber length conditions,the results indicated that the glass fiber reinforcement on the shear strength of ceramsite foamed con-crete is higher than the other kinds of fibers,polypropylene fiber followed,cotton stalk fiber is the lowest one.However,adding cotton fiber into ceramsite foamed concrete can also effectively improve its shear strength.Under the same cotton stalk fiber length but different fiber content conditions,it can be found that the blocks shear strength of 0.8% fiber content group is the highest with 39.2% increase in shear strength as compared with the same ratio for fiber specimens.Under the same cotton stalk fiber content but different fiber length conditions,it can be found that the 11-15 mm length of cotton fiber can further enhance the shear strength of ceramsite foamed concrete.The shear-compression ratio of cotton straw fiber reinforced ceramsite foamed con-crete is high and its shear performance is good.%为研究棉秆纤维对陶粒泡沫混凝土抗剪强度的影响，采用双面剪切法进行抗剪性能试验，对比相同纤维掺量及纤维长度下，棉秆纤维、玻璃纤维和聚丙烯纤维对陶粒泡沫混凝土抗剪强度的增强效果，分析棉秆纤维掺入量和纤维长度两个因素在不同水平下对陶粒泡沫混凝土抗剪强度的影响。结果表明：在0．2％纤维掺量及6～10 mm 纤维长度下，3种纤维中玻璃纤维对陶粒泡沫混凝土抗剪强度的增强效果最大，聚丙烯纤维次之，棉秆纤维最小，但掺加棉秆纤维亦能有效提高陶粒泡沫混凝土抗剪强度；相同棉秆纤维长度但不同纤维掺量下，0．8％掺量组的试块抗剪强度最高，其抗剪强度较同配比未掺纤维的试块提高39．2％；相同棉秆纤维掺量但不同棉秆纤维长度下，11～15 mm 长度的棉秆纤维能进一步增强陶粒泡沫混凝土的抗剪强度。棉秆纤维增强型陶粒泡沫混凝土的剪压比较高，抗剪性能好。
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