预应力钢纤维混凝土梁斜截面抗裂试验与计算

金立兵; 陆春华; 王录民

doi:10.3969/j.issn.1671-7775.2010.05.022

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江苏大学学报（自然科学版） ›› 2010, Vol. 31 ›› Issue (5) : 601-605. DOI: 10.3969/j.issn.1671-7775.2010.05.022

论文

预应力钢纤维混凝土梁斜截面抗裂试验与计算

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Experimental study on shear-cracking capacity of prestressed steel fiber reinforced concrete beams

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摘要

为研究预应力技术对钢纤维混凝土抗裂性能的增强效果,通过无粘结预应力钢筋钢纤维混凝土简支梁斜截面抗裂性能试验,建立了无粘结预应力钢筋钢纤维混凝土简支梁斜截面抗裂承载力的计算公式;分析了钢纤维含量特征值与剪跨比等因素对无粘结预应力钢筋钢纤维混凝土简支梁斜截面开裂裂缝形态的影响;探讨了钢纤维含量特征值、剪跨比与有效预压力对预应力钢筋混凝土梁的影响程度与规律．研究表明,预应力与钢纤维可以有效提高钢筋混凝土梁的抗裂承载力．一定范围内,斜截面抗裂承载力随钢纤维体积分数和长径比的增大而提高;预应力可延迟剪跨区梁底弯曲裂缝的出现,减小斜裂缝的倾角,增大剪压区高度．

Abstract

In order to study the shear-cracking enhancement effect of prestressed technology to steel fiber reinforced concrete, the practical formulas were proposed for evaluating the shear-cracking capacity of unbonded steelfiber prestressed reinforced concrete beams (UPSFRCB) through the test and analysis of shearcracking strength of UPSFRCB with simply supported ends. Various factors affecting the shear-cracking strength of UPSFRCB with simply supported ends, such as the characteristic value of steel fiber and shear-span to depth ratio, were analyzed. The degrees and rules of the characteristic value of steel fiber, shearspan to depth ratio, and effective prestress force, which affected prestressed concrete beams, were also discussed. The results show that prestress and steel fiber can effectively enhance the shear-cracking capacity of reinforced concrete beams. The shear-cracking load increases with the increase of the steel fiber volume ratio and the length to diameter ratio within a certain range. The prestress can retard the occurrence of bending crack at the beam bottom of the shear span, reduce the inclination angle of the diagonal crack, and increase the height of the shear-compression zone.

导出引用

金立兵, 陆春华, 王录民. 预应力钢纤维混凝土梁斜截面抗裂试验与计算[J]. 江苏大学学报（自然科学版）, 2010, 31(5): 601-605 https://doi.org/10.3969/j.issn.1671-7775.2010.05.022

JIN Libing, LU Chunhua, WANG Lumin. Experimental study on shear-cracking capacity of prestressed steel fiber reinforced concrete beams[J]. Journal of Jiangsu University(Natural Science Edition), 2010, 31(5): 601-605 https://doi.org/10.3969/j.issn.1671-7775.2010.05.022

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