预应力筋局部锈蚀断裂混凝土梁抗弯性能试验研究
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摘要
为了研究钢绞线腐蚀断裂对后张预应力混凝土梁受弯性能的影响,制作5片混凝土梁,在不同部位进行电化学快速腐蚀使钢绞线发生局部断裂,然后对其进行静载试验,研究钢绞线局部断裂对混凝土梁裂缝扩展、挠度变形、破坏模式和极限承载力的影响,进而探讨局部断裂的混凝土梁抗弯承载力计算分析方法和抗弯性能数值模拟方法。研究结果表明:预应力筋局部锈蚀断裂对开裂荷载影响较小,但导致构件裂缝分布发生改变,裂缝数量减小,裂缝高度不均匀性明显;构件的破坏形式由断筋局部损伤及对应区域的截面内力共同决定,若断口处弯矩较大,则很可能引起少筋破坏;反之,钢绞线断裂对破坏形式影响较小;钢绞线断裂引起混凝土梁刚度减小,其减小程度与钢绞线断裂的位置相关,钢绞线断裂在端部锚固区对梁的刚度影响很小,从锚固区到弯剪区到纯弯段,刚度减小依次增大;构件极限承载能力受钢绞线断裂位置影响,钢绞线断裂位置越靠近跨中,其抗弯承载力减小越明显。
In order to study the degradation bending property of the post tensioned prestressed concrete beam with the corroded and fractured strand, five kinds of beams were manufactured. An accelerated corrosion test was used to obtain different locally corroded and fractured strands, then all beams were subjected to static load test. The influences of local breakage of steel strands on the crack propagation, deflection deformation, failure mode and ultimate bearing capacity of concrete beams were studied. The calculation method of bending capacity of local fractured concrete beams and numerical simulation method of bending performance were discussed. The results show that the local corrosion fracture of the prestressed tendon has little effect on the cracking load, but it leads to the change of the crack distribution of the component, the decrease of the number of cracks, and the inhomogeneity of the crack height. The failure mode of the beam is determined by the local damage of the broken strand and the internal force of the section in the corresponding region. If the moment at the fracture is large, it causes less rib damage. Conversely, the breakage of the strand has little effect on the damage mode. The stiffness of the concrete beam is degraded due to fracture of the strand, and the degree ofdegradation is related to the location of the strand fracture. Strand fracture has little effect on the stiffness of the beam at the end anchorage zone, but the stiffness degradation is gradually increased from the anchorage zone to the bending shear zone and then to the purely curved zone. The ultimate load-carrying capacity of the component is affected by the breaking position of the strand. When the fracture location of the steel strand is closer to the middle of the span, the bending capacity is more deteriorated.
In order to study the degradation bending property of the post tensioned prestressed concrete beam with the corroded and fractured strand, five kinds of beams were manufactured. An accelerated corrosion test was used to obtain different locally corroded and fractured strands, then all beams were subjected to static load test. The influences of local breakage of steel strands on the crack propagation, deflection deformation, failure mode and ultimate bearing capacity of concrete beams were studied. The calculation method of bending capacity of local fractured concrete beams and numerical simulation method of bending performance were discussed. The results show that the local corrosion fracture of the prestressed tendon has little effect on the cracking load, but it leads to the change of the crack distribution of the component, the decrease of the number of cracks, and the inhomogeneity of the crack height. The failure mode of the beam is determined by the local damage of the broken strand and the internal force of the section in the corresponding region. If the moment at the fracture is large, it causes less rib damage. Conversely, the breakage of the strand has little effect on the damage mode. The stiffness of the concrete beam is degraded due to fracture of the strand, and the degree ofdegradation is related to the location of the strand fracture. Strand fracture has little effect on the stiffness of the beam at the end anchorage zone, but the stiffness degradation is gradually increased from the anchorage zone to the bending shear zone and then to the purely curved zone. The ultimate load-carrying capacity of the component is affected by the breaking position of the strand. When the fracture location of the steel strand is closer to the middle of the span, the bending capacity is more deteriorated.
引文
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[16]王春江,朱震宇,李向民,等.砌体墙侧间受力性能精细有限元模拟[J].浙江大学学报(工学版),2016,50(6):1025-1030.WANG Chunjiang,ZHU Zhenyu,LI Xiangmin,et al.High-precision finite element simulation on lateral mechanical behavior of masonry wall[J].Journal of Zhejiang University(Engineering Science),2016,50(6):1025-1030.
[17]王翔翔,闫明,庞苗.考虑温度荷载的砌体结构分离式有限元分析[J].土木工程学报,2010,43(增刊):252-257.WANG Xiangxiang,YAN Ming,PANG Miao.Finite element analysis of masonry structure based on micro-model[J].China Civil Engineering Journal,2010,43(Suppl):252-257.
[18]方自虎,周海俊,赖少颖,等.ABAQUS混凝土应力-应变关系选择[J].建筑结构,2013,43(10):559-561.FANG Zihu,ZHOU Haijun,LAI Shaoying,et al.Choose of ABAQUS concrete stress-strain curve[J].Building Structure,2013,43(10):559-561.
[2]TREJO D,PILLAI R G,HUESTE M B D,et al.Parameters corrosion and tension capacity of post tensioning strands[J].ACl Materials Journal,2009,106(2):l44-153.
[3]李富民,邓天慈,王江浩,等.预应力混凝土结构耐久性研究综述[J].建筑科学与工程学报,2015,32(2):1-20.LI Fumin,DENG Tianci,WANG Jianghao,et al.Review of research on durability of prestressed concrete structure[J].Journal of Architecture and Civil Engineering,2015,32(2):1-20.
[4]Concreate Society.Durable post-tensioned concrete bridges technical report No.47[R].2nd ed.Crowthorne,UK:Concrete Society,2002:1-10.
[5]WANG Lei,ZHANG Xuhi,ZHANG Jianren,et al.Simplified model for corrosion induced bond degradation between steel strand and concrete[J].Journal of Materials in Civil Engineering,2017,29(4):04016257.
[6]PANTEKI E,MáCA P,H?USSLER-COMBER U.Finite element analysis of dynamic concrete-to-rebar bond experiments in push-in configuration[J].International Journal of Impact Engineering,2017,106:155-170.
[7]郑静,曾辉辉,朱本珍.腐蚀对锚索力学性能影响的试验研究[J].岩石力学与工程学报,2010,29(12):2469-2474.ZHENG Jing,ZENG Huihui,ZHU Benzhen.Test study of influence of erosion on mechanical behavior of anchor[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2469-2474.
[8]VU N A,CASTEL A,FRAN?OIS R.Effect of stress corrosion cracking on stress-strain response of steel wires used in prestressed concrete beams[J].Corrosion Science,2009,51(6):1453-1459.
[9]LI Fumin,YUAN Yingshu,LI Chunqing.Corrosion propagation of prestressing steel strands in concrete subject to chloride attack[J].Construction and Building Materials,2011,25(10):3878-85.
[10]李富民,袁迎曙.腐蚀钢绞线预应力混凝土梁的受弯性能试验研究[J].建筑结构学报,2010,31(2):78-84.LI Fumin,YUAN Yingshu.Experimental study on bending property of prestressed concrete beams with corroded steel strands[J].Journal of Building Structure,2010,31(2):78-84.
[11]蔺恩超.预应力筋应力腐蚀后预应力混凝土梁的受力性能研究[D].扬州:扬州大学建筑科学与工程学院,2006:50-68.LIN Enchao.Experimental reseach on the properties of prestressed concrete beams after the SCC of prestressed bars[D].Yangzhou:Yangzhou University.College of Civil Science and Engineering,2006:50-68.
[12]余芳,贾金青,宋玉普.钢绞线腐蚀后的部分预应力混凝土梁抗弯疲劳性能试验研[J].建筑结构,2012,42(1):97-100.YU Fang,JIA Jinqing,SONG Yupu.Experimental research on fatigue behavior of prestressed concrete beams with corroded steel strands[J].Building Structure,2012,42(1):97-100.
[13]李富民,杨俊,施小飞.腐蚀钢绞线预应力混凝土梁的弯曲疲劳性能退化特征[J].建筑科学与工程学报,2016,33(1):22-29.LI Fuming,YANG Jun,SHI Xiaofeil.Degradation characteristics of flexural fatigue property of prestressed concrete beam with corroded steel strand[J].Journal of Architecture and Civil Engineering,2016,33(1):22-29.
[14]朱尔玉,刘椿,何立,等.预应力混凝土桥梁腐蚀后的受力性能分析[J].中国安全科学学报,2002,16(2):136-140.ZHU Eryu,LIU Chun,HE Li,et al.Stress performance analysis on corroded prestressed concrete beam[J].China Safety Science Journal,2002,16(2):136-140.
[15]刘海成,郭全全,吴金国.部分预应力混凝土环形截面压弯构件延性系数计算[J].沈阳建筑大学学报(自然科学版),2006,22(1):15-20.LIU Haicheng,GUO Quanquan,WU Jinguo.Study on ductility factor of compress-bend member for partial prestressed concrete with ring section[J].Journal of Shengyang Jianzhu University,2006,22(1):15-20.
[16]王春江,朱震宇,李向民,等.砌体墙侧间受力性能精细有限元模拟[J].浙江大学学报(工学版),2016,50(6):1025-1030.WANG Chunjiang,ZHU Zhenyu,LI Xiangmin,et al.High-precision finite element simulation on lateral mechanical behavior of masonry wall[J].Journal of Zhejiang University(Engineering Science),2016,50(6):1025-1030.
[17]王翔翔,闫明,庞苗.考虑温度荷载的砌体结构分离式有限元分析[J].土木工程学报,2010,43(增刊):252-257.WANG Xiangxiang,YAN Ming,PANG Miao.Finite element analysis of masonry structure based on micro-model[J].China Civil Engineering Journal,2010,43(Suppl):252-257.
[18]方自虎,周海俊,赖少颖,等.ABAQUS混凝土应力-应变关系选择[J].建筑结构,2013,43(10):559-561.FANG Zihu,ZHOU Haijun,LAI Shaoying,et al.Choose of ABAQUS concrete stress-strain curve[J].Building Structure,2013,43(10):559-561.