钢纤维-GFRP箍筋混凝土梁受剪抗裂性能试验研究
Experimental study on shear-cracking resistance of steel fiber concrete beams reinforced with GFRP stirrups
王孝平 1李文龙 2郭生全1
作者信息
- 1. 中冶检测认证(安徽)有限公司,安徽马鞍山 243000
- 2. 阜阳师范大学信息工程学院,安徽阜阳 236041
- 折叠
摘要
为解决纤维增强聚合物(FRP)配筋混凝土梁的受剪抗裂性能不足和挠度过大等问题,在混凝土中掺入具有优良阻裂特性的钢纤维是一种有效途径.通过8 根钢纤维—玻璃纤维增强聚合物(GFRP)箍筋混凝土梁的受剪试验,研究了钢纤维体积率(0.5%、1.0%、1.5%)和剪跨比(1.5、2.0、3.0)对试验梁斜截面抗裂性能的影响.结果表明:钢纤维能够有效抑制GFRP箍筋混凝土梁内部微裂缝的扩展,提高其整体刚度和抗裂性能.当剪跨比为2.0时,钢纤维体积率为1.5%试验梁的开裂剪力相对于未掺纤维对比梁增加了38.4%.随着剪跨比增加,试验梁受剪抗裂性能逐渐降低.基于试验数据和已有研究结果,提出了钢纤维-GFRP箍筋混凝土梁开裂剪力的建议计算方法,该方法的计算值与试验值吻合良好.
Abstract
The incorporation of steel fibers with excellent crack-resistant properties into concrete is an effective approach to solve the problems of insufficient shear crack resistance and excessive deflection on the beams reinforced with fiber rein-forced polymer(FRP)stirrups.The effects of steel fiber volume rates(0.5%,1.0%,1.5%)and shear span ratios(1.5,2.0,3.0)on the shear crack resistance of the test beams are investigated by testing the shear performance of eight concrete beams reinforced with glass fiber polymer composite(GFRP)stirrups.The results show that steel fiber can effectively inhibit the expansion of micro cracks inside the concrete beams reinforced with GFRP stirrups and thus improve their overall stiff-ness and crack resistance.When the shear span ratio is 2.0,the shear-cracking resistance of the test beam with the steel fi-ber volume ratio of 1.5%increases by 38.4%compared with the control beam without steel fibers.With the increase of shear span ratio,the shear crack resistance of the test beams gradually decreases.Based on the experimental data and exist-ing research results,a suggested formula for cracking load of inclined section of steel fiber concrete beams reinforced with FRP stirrups is proposed,and the calculated values of the proposed model are consistent with the experimental values.
关键词
钢纤维/GFRP箍筋/剪跨比/开裂剪力Key words
steel fiber/GFRP stirrups/shear span ratio/shear-cracking force引用本文复制引用
基金项目
安徽省教育厅自然科学研究重点项目(2022AH052823)
阜阳师范大学信息工程学院自然科学重点项目(FXG2021ZZ01)
阜阳师范大学信息工程学院青年人才基金重点项目(2022xgrcxm04)
阜阳师范大学信息工程学院质量工程重点项目(2022XGJYZD02)
出版年
2024
国家科技期刊平台
NSTL
万方数据