湿热环境下预应力CFRP加固高强混凝土梁的抗弯性能研究
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摘要
为研究高温、高湿环境对碳纤维布加固高强混凝土梁抗弯性能的影响,在温度为40℃和温度为20℃环境下,对CFRP预应力及非预应力加固的24根梁进行弯曲试验。结果表明:在温度为20℃的自然环境下,与无CFRP布粘贴的基准梁相比,粘贴非预应力CFRP布加固的试验梁,其开裂荷载提高35.6%,极限荷载提高37.6%,并且随着CFRP的施加和预应力等级的逐渐加大,其开裂荷载显著升高;在温度为40℃的湿热环境下,与无CFRP布粘贴的基准梁相比,非预应力CFRP加固的试验梁,其开裂荷载提高27.3%,极限荷载提高29.3%,随着CFRP预应力等级逐渐提高,其开裂荷载呈逐渐增大趋势;与温度为20℃自然环境相比,在温度为40℃的湿热环境下,试验梁的开裂荷载与极限荷载呈下降趋势,且随着预应力等级的增大,下降幅度变大。
In order to analyze the flexural performance of CFRP reinforced high-strength concrete beams in wet-thermal environments, 24 non-prestressed and CFRP prestressing beams were tested for bending under the environments where the relative humidity is 98%, the temperature is 40℃, the relative humidity is 70% and the temperature is 20℃. The results show that compared with high-strength concrete beams, the cracking load and ultimate load of CFRP reinforced high-strength concrete beams increased by 35.6% and 37.6% when the temperature is 20℃ and humidity is 70%. With the increase of CFRP prestress, the ultimate load and the cracking load have significantly increased. Compared with high-strength concrete beams, the CFRP-reinforced high-strength concrete's ultimate load increased by 27.3% and 29.3% under the environments where the humidity is 98% and the temperature is 40℃. With the increase of the CFRP prestress, the ultimate load and the cracking load have remarkably increased. Compared with the environments where the relative humidity is 70% and the temperature is 20℃, beams, cracking load and the ultimate load have different degrees of decline under conditions of relative humidity of 98%, the temperature of 40℃. With the prestress level increases, the decline has become larger.
In order to analyze the flexural performance of CFRP reinforced high-strength concrete beams in wet-thermal environments, 24 non-prestressed and CFRP prestressing beams were tested for bending under the environments where the relative humidity is 98%, the temperature is 40℃, the relative humidity is 70% and the temperature is 20℃. The results show that compared with high-strength concrete beams, the cracking load and ultimate load of CFRP reinforced high-strength concrete beams increased by 35.6% and 37.6% when the temperature is 20℃ and humidity is 70%. With the increase of CFRP prestress, the ultimate load and the cracking load have significantly increased. Compared with high-strength concrete beams, the CFRP-reinforced high-strength concrete's ultimate load increased by 27.3% and 29.3% under the environments where the humidity is 98% and the temperature is 40℃. With the increase of the CFRP prestress, the ultimate load and the cracking load have remarkably increased. Compared with the environments where the relative humidity is 70% and the temperature is 20℃, beams, cracking load and the ultimate load have different degrees of decline under conditions of relative humidity of 98%, the temperature of 40℃. With the prestress level increases, the decline has become larger.
引文
[1] Huang L,Yan B,Yan L,et al.Reinforced concrete beams strengthened with externally bonded natural flax FRP plates[J].Composites Part B:Engineering,2016,91:569-578.
[2] 洪雷,张雨剑,王苏岩.冻融循环作用下CFRP-高强混凝土的界面行为[J].水利与建筑工程学报,2016,14(3):200-205.
[3] 张红涛.复杂环境与荷载作用下CFRP加固高强钢筋混凝土梁耐久性能研究[D].大连:大连理工大学,2018.
[4] 江海鑫.冻融和干湿循环下预应力CFRP加固高强混凝土的耐久性研究[D].大连:大连理工大学,2017.
[5] 钮鹏,李旭,王晓初,等.FRP增强加固技术在土木工程中的研究进展[J].混凝土,2018(5):152-156.
[6] Hawileh R A,Rasheed H A,Abdalla J A,et al.Behavior of reinforced concrete beams strengthened with externally bonded hybrid fiber reinforced polymer systems[J].Materials & Design,2014,53:972-982.
[7] 洪雷,太永伟.预应力CFRP加固高强混凝土梁试验[J].建筑科学与工程学报,2018,35(6):66-72.
[8] Aslam M,Shafigh P,Jumaat M Z,et al.Strengthening of RC beams using prestressed fiber reinforced polymers-A review[J].Construction and Building Materials,2015,82:235-256.
[9] 李伟文,徐文冰,周英武,等.硫酸盐溶液干湿循环对FRP加固混凝土梁抗剪性能的劣化作用[J].北京工业大学学报,2014,40(8):1226-1231.
[10] Tang Hongyuan,Deng Xuezhi,Zhou Xiaojun.Experimental study on behavior of steel channel strengthened with CFRP[J].Curved and Layered Structures,2017,4(1):288-298.
[11] 朱虹,施嘉伟,吴刚,等.FRP加固混凝土结构冻融循环耐久性能研究综述[J].建筑结构,2007,37(S1):389-392.
[12] 尚守平,张宝静,吕新飞.预应力CFRP 板加固钢筋混凝土梁间接刚度试验[J].中国公路学报,2016,29(11):74-81.
[13] 王勃,孙正财,周柏成,等.预应力CFRP加固混凝土结构[J].混凝土,2018(1):151-153.
[14] 张剑,江雷,殷王华.预应力CFRP/GFRP纤维加固梁的延性性能研究[J].新技术新工艺,2016,12(14):34-35.
[15] Klamer E L,Hordijk D A,Janssen H J M.The influence of temperature on the bonding of externally bonded CFRP[J].ACI Special Publication,2005,230(88):1551-1570.
[16] 王苏岩,朱方芳,张红涛,等.持载与湿热环境下CFRP加固高强混凝土梁结构性能研究[J].水利与建筑工程学报,2018,16(3):36-41.
[17] 曲俊龙,洪雷,王涛,等.一种FRP预应力加载试验装置:中国,CN207650018U[P].2018-07-24.
[2] 洪雷,张雨剑,王苏岩.冻融循环作用下CFRP-高强混凝土的界面行为[J].水利与建筑工程学报,2016,14(3):200-205.
[3] 张红涛.复杂环境与荷载作用下CFRP加固高强钢筋混凝土梁耐久性能研究[D].大连:大连理工大学,2018.
[4] 江海鑫.冻融和干湿循环下预应力CFRP加固高强混凝土的耐久性研究[D].大连:大连理工大学,2017.
[5] 钮鹏,李旭,王晓初,等.FRP增强加固技术在土木工程中的研究进展[J].混凝土,2018(5):152-156.
[6] Hawileh R A,Rasheed H A,Abdalla J A,et al.Behavior of reinforced concrete beams strengthened with externally bonded hybrid fiber reinforced polymer systems[J].Materials & Design,2014,53:972-982.
[7] 洪雷,太永伟.预应力CFRP加固高强混凝土梁试验[J].建筑科学与工程学报,2018,35(6):66-72.
[8] Aslam M,Shafigh P,Jumaat M Z,et al.Strengthening of RC beams using prestressed fiber reinforced polymers-A review[J].Construction and Building Materials,2015,82:235-256.
[9] 李伟文,徐文冰,周英武,等.硫酸盐溶液干湿循环对FRP加固混凝土梁抗剪性能的劣化作用[J].北京工业大学学报,2014,40(8):1226-1231.
[10] Tang Hongyuan,Deng Xuezhi,Zhou Xiaojun.Experimental study on behavior of steel channel strengthened with CFRP[J].Curved and Layered Structures,2017,4(1):288-298.
[11] 朱虹,施嘉伟,吴刚,等.FRP加固混凝土结构冻融循环耐久性能研究综述[J].建筑结构,2007,37(S1):389-392.
[12] 尚守平,张宝静,吕新飞.预应力CFRP 板加固钢筋混凝土梁间接刚度试验[J].中国公路学报,2016,29(11):74-81.
[13] 王勃,孙正财,周柏成,等.预应力CFRP加固混凝土结构[J].混凝土,2018(1):151-153.
[14] 张剑,江雷,殷王华.预应力CFRP/GFRP纤维加固梁的延性性能研究[J].新技术新工艺,2016,12(14):34-35.
[15] Klamer E L,Hordijk D A,Janssen H J M.The influence of temperature on the bonding of externally bonded CFRP[J].ACI Special Publication,2005,230(88):1551-1570.
[16] 王苏岩,朱方芳,张红涛,等.持载与湿热环境下CFRP加固高强混凝土梁结构性能研究[J].水利与建筑工程学报,2018,16(3):36-41.
[17] 曲俊龙,洪雷,王涛,等.一种FRP预应力加载试验装置:中国,CN207650018U[P].2018-07-24.