钢筋钢纤维混凝土深梁抗裂度的计算方法  

Calculation method for crack resistance of steel fiber concrete deep beams with reinforcement

作　　者：高丹盈[1] 赵军[2] 朱海堂[1] 张启明[1] 

机构地区：[1]郑州大学水环境系 [2]郑州大学土木工程学院河南郑州450002

出　　处：《水利学报》2002年第11期124-128,共5页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目 (5 94790 0 1)

摘　　要：通过对 2 8根深梁的试验研究 ,探讨了钢纤维混凝土层厚、钢纤维体积率和剪跨比等因素对钢筋钢纤维增强部分混凝土深梁正截面抗裂度和斜截面抗裂度的影响 ,以及达到全截面加入钢纤维对抗裂度增强效果的钢纤维混凝土层厚。试验表明 :深梁的抗裂度随钢纤维体积率的增加而增大 ,当钢纤维体积率 ρf=2 0 %时 ,正截面可提高 80 %左右 ,斜截面抗裂度可提高 5 0 %左右 ,当钢纤维混凝土层厚达到深梁高度的 0 6倍时 ,可达到全截面加入钢纤维对抗裂度的增强效果。The effect of concrete layer thickness with steel fibers,volume fractions of steel fibers and shear to span ratio on crack resistance of steel fiber reinforced concrete deep beams with reinforcement is investigated experimentally through twenty eight beam tests.The specimens include 3 conventional concrete deep beams with reinforcement,13 whole section steel fiber concrete deep beams with reinforcement and 12 partial section steel fiber reinforced concrete deep beams with reinforcement.The results show that the steel fibers remarkably elevate the crack resistance.When volume fraction reaches 2 0%,the normal section crack resistance elevates 80% and diagonal section crack resistance 50% approximatly.The effect of steel fiber concrete with layer thickness of 0 6 beam depth is equivalent to that of full depth.Base on the experimental data a universal formula for calculating the crack resistance of deep beams with different thickness of steel fiber concrete layer is proposed.

关 键 词：钢筋钢纤维混凝土 深梁和 抗裂度 

分 类 号：TU377.9[建筑科学—结构工程]