摘要
为提高以裂缝为主要控制目标的大面积构造配筋混凝土受弯结构的抗裂性能,探讨钢纤维混凝土在此类结构中的应用,进行了16根三分点正向对称集中荷载作用下无筋足尺钢纤维混凝土梁替代构造配筋混凝土梁的弯曲抗裂性能试验,分析了钢纤维体积率、钢种和布筋位置等对试件受弯性能的影响。研究结果表明,钢纤维体积率0.5%的钢纤维混凝土梁的抗裂性能、限裂性能和承载力均优于截面中部配筋混凝土梁;钢纤维体积率(1.0～1.5)%的钢纤维混凝土梁的抗裂性能和限裂性能均明显优于截面双筋混凝土梁;钢纤维体积率(1.5～2.0)%的钢纤维混凝土梁除抗裂性能和限裂性能外,其承载力也优于截面双筋混凝土梁。因此,对于大型水利和土木工程中以抗裂或限裂为主要控制条件的受弯构件,可用钢纤维混凝土替代构造配筋混凝土。
To improve the crack-resistance performance of massive flexural concrete structures usually with only composition reinforced steel bars, and to study the application of steel fibers to such structures, the flexural performances of 16 full size SFRC （steel fiber reinforced concrete） beams were tested under four concentrated forces. The influence of steel fiber volume content, steel type and its location on the flexural behavior was analyzed. The experimental results show that the crack-resistance performance and flexural capacity of SFRC beams with a 0.5% steel fiber volume content is superior to RC beams that are reinforced in the tension side of middle sections with the composition reinforcement, and the crack-resistance performance of SFRC beams with （1.0-1.5） % steel fiber volume content is obviously superior to composition RC beams, and the crack-resistance performance and flexural capacity of SFRC beams with （1.5-2.0） % steel fiber volume content are superior to RC beams reinforced on both the tension and the compression side with composition reinforcement. Therefore, the SFRC can replace the composition RC for improving crack-resistance performance of flexural structures.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第8期33-37,共5页
China Civil Engineering Journal
基金
河南省科技攻关课题(0324240013)
河南省高等学校创新人才培养工程项目(2005)
