预应力RPC-NC叠合梁弯曲疲劳性能试验分析
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摘要
为研究预应力活性粉末混凝土(RPC)-普通混凝土(NC)叠合梁的弯曲疲劳性能,以中国铁路32 m跨度T型梁为原型,设计并制作了4根完全相同的缩尺模型RPC-NC叠合梁,其中1根梁进行静载试验另外3根梁进行等幅疲劳试验.对试验梁在不同疲劳加载循环下的正截面应变分布、受压区NC应变变化、裂缝发展、疲劳挠度及刚度发展的变化规律进行了分析,并将疲劳加载后未发生疲劳破坏的叠合梁、未经历疲劳加载的叠合梁以及相同结构尺寸和配筋情况下的普通混凝土梁的静力弯曲性能进行对比.结果表明:和普通混凝土适筋梁相同,RPC-NC叠合梁的疲劳破坏由非预应力纵筋疲劳断裂引起;在疲劳荷载作用下,截面应变沿截面高度始终近似呈线性分布,RPC-NC叠合梁正截面变形符合平截面假定;疲劳加载结束后,未发生破坏的RPC-NC叠合梁和疲劳加载前相比延性有所下降,但仍大于未经历疲劳加载的普通混凝土梁.根据试验结果,拟合得到试验梁与疲劳加载循环次数有关的刚度退化公式,可为RPC-NC叠合梁的设计提供一定的参考.
To study the flexural fatigue performance of prestressed reactive powder concrete(RPC)-normal concrete(NC) composite beams, four identical reduced-scale model beams were designed and produced on the basis of a 32 m span T-girder of Chinese railway. One of the beams suffered static load and others were under bending fatigue test. Strain distribution in normal section, strain variation in compressed NC, crack propagation, and the development of fatigue deflection and stiffness were analyzed. Furthermore, flexural property of the composite beams without failure after fatigue loading were compared with the composite beams that did not experience fatigue loading and the NC beams with identical structural size and reinforcement condition. Results show that fatigue failure of prestressed RPC-NC composite beams was caused by the fatigue fracture of non-prestressed longitudinal bars, which was the same as balanced-reinforced NC beam. Strain in normal section was always approximately linear with the height of the section under fatigue load, which means the plane section assumption can be applied to prestressed RPC-NC composite beams. Flexural ductility of the composite beams without failure after fatigue loading declined compared with the composite beam before fatigue loading, while it was still greater than NC beam. Stiffness degradation formula of test beams related to fatigue loading cycles was obtained by fitting experimental data, which can be a reference for the design of prestressed RPC-NC composite beams.
To study the flexural fatigue performance of prestressed reactive powder concrete(RPC)-normal concrete(NC) composite beams, four identical reduced-scale model beams were designed and produced on the basis of a 32 m span T-girder of Chinese railway. One of the beams suffered static load and others were under bending fatigue test. Strain distribution in normal section, strain variation in compressed NC, crack propagation, and the development of fatigue deflection and stiffness were analyzed. Furthermore, flexural property of the composite beams without failure after fatigue loading were compared with the composite beams that did not experience fatigue loading and the NC beams with identical structural size and reinforcement condition. Results show that fatigue failure of prestressed RPC-NC composite beams was caused by the fatigue fracture of non-prestressed longitudinal bars, which was the same as balanced-reinforced NC beam. Strain in normal section was always approximately linear with the height of the section under fatigue load, which means the plane section assumption can be applied to prestressed RPC-NC composite beams. Flexural ductility of the composite beams without failure after fatigue loading declined compared with the composite beam before fatigue loading, while it was still greater than NC beam. Stiffness degradation formula of test beams related to fatigue loading cycles was obtained by fitting experimental data, which can be a reference for the design of prestressed RPC-NC composite beams.
引文
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[16]罗小勇,陈跃科,邓鹏麒.无粘结部分预应力混凝土梁的疲劳性能试验研究[J].建筑结构学报,2007,28(3):100LUO Xiaoyong,CHEN Yueke,DENG Pengqi.Experimental study on fatigue properties of unbounded partially prestressed concrete (UPC) beams[J].Journal of Building Structures,2007,28(3):100.DOI:10.14006/j.jzjgxb.2007.03.013
[2] YU R,SPIESZ P,BROUWERS H J H.Mix design and properties assessment of ultra-high performance fibre reinforced concrete (UHPFRC)[J].Cement and Concrete Research,2014,56:29.DOI:10.1016/j.cemconres.2013.11.002
[3] WILLE K,EL-TAWIL S,NAAMAN A E.Properties of strain hardening ultra high performance fiber reinforced concrete (UHP-FRC) under direct tensile loading[J].Cement & Concrete Composites,2014,48:53.DOI:10.1016/j.cemconcomp.2013.12.015
[4] AHMAD S,ZUBAIR A,MASLEHUDDIN M.Effect of key mixture parameters on flow and mechanical properties of reactive powder concrete[J].Construction and Building Materials,2015,99:73.DOI:10.1016/j.conbuildmat.2015.09.010
[5] NOSHIRAVANI T,BRüHWILER E.Rotation capacity and stress redistribution ability of R-UHPFRC-RC composite continuous beams:an experimental investigation[J].Materials and Structures,2013,46:2013.DOI:10.1617/s11527-013- 0033-5
[6] HUYNH L,FOSTER S,VALIPOUR H,et al.High strength and reactive powder concrete columns subjected to impact:experimental investigation[J].Construction and Building Materials,2015,78:153.DOI:10.1016/j.conbuildmat.2015.01.026
[7] 李莉,郑文忠.活性粉末混凝土连续梁塑性性能试验[J].哈尔滨工业大学学报,2010,42(2):193LI Li,ZHENG Wenzhong.Experimental study on plastic property of reactive powder concrete continuous beams[J].Journal of Harbin Institute of Technology,2010,42(2):193.DOI:10.11918/ j.issn.0367-6234.2010.02.005
[8] 邓宗才,袁常兴.高强钢筋与活性粉末混凝土黏结性能的试验研究[J].土木工程学报,2014,47(3):69DENG Zongcai,YUAN Changxing.Experimental study on bond capability between high strength rebar and reactive powder concrete[J].China Civil Engineering Journal,2014,47(3):69.DOI:10.15951/j.tmgcxb.2014.03.011
[9] MOSTOFINEJAD D,NIKOO M R,HOSSEINI S A.Determination of optimized mix design and curing conditions of reactive powder concrete (RPC)[J].Construction and Building Materials,2016,123:754.DOI:10.1016/j.conbuildmat.2016.07.082
[10]郑文忠,吕雪源.活性粉末混凝土研究进展[J].建筑结构学报,2015,36(10):45ZHENG Wenzhong,LV Xueyuan.Literature review of reactive powder concrete[J].Journal of Building Structures,2015,36(10):45.DOI:10.14006/j.jzjgxb.2015.10.006
[11]季文玉,李旺旺,过民龙,等.预应力RPC-NC叠合梁挠度试验及计算方法[J].吉林大学学报(工学版),2018,48(1):130JI Wenyu,LI Wangwang,GUO Minlong,et al.Experimentation and calculation methods of prestressed RPC-NC composite beam deflection[J].Journal of Jilin University (Engineering and Technology Edition),2018,48(1):130.DOI:10.13229/j.cnki.jdxbgxb20161204
[12]HABEL K.Structural behaviour of elements combining ultra-high performance fibre reinforced concretes (UHPFRC) and reinforced concrete[D].Lausanne:Universit?t Karlsruhe,2004
[13]HABEL K,DENARIé E,BRüHWILER E.Time dependent behavior of elements combining ultra-high performance fiber reinforced concretes (UHPFRC) and reinforced concrete[J].Materials and Structures,2006,39:557.DOI:10.1617/s11527-005-9045-0
[14]HABEL K,DENARIé E,BRüHWILER E.Structural response of elements combining ultrahigh-performance fiber-reinforced concretes and reinforced concrete[J].Journal of Structural Engineering,2006,132:1793.DOI:10.1061/(ASCE)0733-9445(2006)132:11(1793)
[15]季文玉,李旺旺,王珏.预应力RPC-NC叠合梁抗弯延性试验分析[J].哈尔滨工业大学学报,2017,49(6):21JI Wenyu,LI Wangwang,WANG Jue.Experimental analysis on flexural ductility of prestressed RPC-NC composite beam[J].Journal of Harbin Institute of Technology,2017,49(6):21.DOI:10.11918 /j.issn.0367-6234.201606036
[16]罗小勇,陈跃科,邓鹏麒.无粘结部分预应力混凝土梁的疲劳性能试验研究[J].建筑结构学报,2007,28(3):100LUO Xiaoyong,CHEN Yueke,DENG Pengqi.Experimental study on fatigue properties of unbounded partially prestressed concrete (UPC) beams[J].Journal of Building Structures,2007,28(3):100.DOI:10.14006/j.jzjgxb.2007.03.013
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