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研究了钢纤维陶粒混凝土的抗拉强度、粘结锚固性能随钢纤维掺量和钢筋直径的变化规律。结果表明:随着钢纤维体积率的增加,陶粒混凝土的轴心抗拉强度逐渐提高,通过对试验数据的拟合得到轴心抗拉强度随钢纤维体积率变化的计算公式;相同钢纤维体积率下,陶粒混凝土粘结强度随钢筋直径的增大呈先提高后降低的趋势,峰值滑移量逐渐降低,钢筋直径为18 mm时,粘结强度最大;相同钢筋直径下,粘结强度随钢纤维体积率的增大而提高,峰值滑移量也逐渐增大;运用最小二乘法建立了基于轴心抗拉强度、钢纤维体积率、la/d、c/d的极限粘结强度公式;在极限粘结强度公式的基础上推导出钢筋在钢纤维陶粒混凝土中的锚固长度公式,并且钢纤维陶粒混凝土的锚固长度可按照GB 50010—2010进行设计。
The tensile strength, bonding and anchoring properties of steel fiber ceramsite concrete were studied with the variation of steel fiber content and steel bar diameter. The results show that with the increase of the volume fraction of steel fiber, the axial tensile strength of ceramsite concrete gradually increases. By fitting the test data, the formula for calculating the change of axial tensile strength with the steel fiber volume fraction is obtained. Under the volumetric rate, the bond strength of ceramsite concrete first increases and then decreases with the increase of the diameter of the steel bar, and the peak slip gradually decreases. When the diameter of the steel bar is 18 mm, the bond strength is the highest; under the same bar diameter, The strength increases with the increase of the volume fraction of steel fiber, and the peak slip increases gradually. The ultimate bond based on axial tensile strength, volume fraction of steel fiber, la / d, c / d is established by least square method Based on the formula of ultimate bond strength, the formula for anchoring length of steel bar in steel fiber ceramsite concrete is deduced. The anchorage length of steel fiber ceramsite concrete can be designed according to GB 50010-2010.