型钢-UHTCC组合梁静载力学性能试验研究
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摘要
为促进超高韧性水泥基复合材料(UHTCC)在组合结构中的应用,开展了型钢-UHTCC组合梁静载力学性能试验研究。同时与型钢-混凝土组合梁试件的荷载-挠度关系、抗弯承载力、裂缝开展、破坏形态以及型钢与两种水泥基材料的变形协调性进行了对比分析。研究结果表明:在UHTCC与混凝土轴心抗压强度基本一致的情况下,UHTCC与混凝土两种材料之间的变形能力差异导致两种组合梁的静载力学性能存在明显差异。与型钢-混凝土组合梁相比,型钢-UHTCC组合梁的跨中最大挠度是其2.26倍,整体性更佳;相同荷载条件下的裂缝宽度仅为其50%左右;抗弯承载力提高了6.4%;跨中截面应变更加符合平截面假定;UHTCC能够与钢材变形协调、共同工作。
To promote the application of ultra-high toughness cementitious composites(UHTCC) in composite structures, research on mechanical performance of steel reinforced UHTCC(SRU) beams was carried out. The load-deflection relationship, the flexural capacity, the crack development, the failure mode and the deformation coordination of the steel and two kinds of cement-based materials were compared and analyzed with steel reinforced concrete(SRC) beams. The results indicated that at approximately same uniaxial compressive strength of UHTCC and concrete, the deformation capacity difference between UHTCC and concrete resulted in obvious mechanical performance differences between the two kinds of composite beams. The maximum deflection in midspan of the SRU beam with better integrity was 2.26 times of the SRC beam. The SRU beam crack width at the same load was only about 50% of the SRC beam. The SRU beam flexural capacity increased by 6.4% and the midspan cross-section strain was more in line with cross-section assumption. UHTCC can coordinate with the steel deformation and work together with steel.
To promote the application of ultra-high toughness cementitious composites(UHTCC) in composite structures, research on mechanical performance of steel reinforced UHTCC(SRU) beams was carried out. The load-deflection relationship, the flexural capacity, the crack development, the failure mode and the deformation coordination of the steel and two kinds of cement-based materials were compared and analyzed with steel reinforced concrete(SRC) beams. The results indicated that at approximately same uniaxial compressive strength of UHTCC and concrete, the deformation capacity difference between UHTCC and concrete resulted in obvious mechanical performance differences between the two kinds of composite beams. The maximum deflection in midspan of the SRU beam with better integrity was 2.26 times of the SRC beam. The SRU beam crack width at the same load was only about 50% of the SRC beam. The SRU beam flexural capacity increased by 6.4% and the midspan cross-section strain was more in line with cross-section assumption. UHTCC can coordinate with the steel deformation and work together with steel.
引文
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[2]徐世烺,李贺东.超高韧性水泥基复合材料直接拉伸试验研究[J].土木工程学报,2009,42(9):32―41.Xu Shilang,Li Hedong.Uniaxial tensile experiments of ultra-high toughness cementitious composite[J].China Civil Engineering Journal,2009,42(9):32―41.(in Chinese)
[3]李庆华,徐世烺.超高韧性水泥基复合材料基本性能和结构应用研究进展[J].工程力学,2009,26(增刊2):23―67.Li Qinghua,Xu Shilang.Performance and application of ultra high toughness cementitious composite:a review[J].Engineering Mechanics,2009,26(Suppl 2):23―67.(in Chinese)
[4]李庆华,徐世烺.钢筋增强超高韧性水泥基复合材料受弯构件理论分析[J].工程力学,2010,27(7):92―102.Li Qinghua,Xu Shilang.Theoretical analysis on flexural behavior of reinforced ultra high toughness cementitious composite members[J].Engineering Mechanics,2010,27(7):92―102.(in Chinese)
[5]Maalej M,Li V C.Introduction of Strain Hardening Engineered Cementitious Composites in Design of Reinforced Concrete Flexural Members for Improved Durability[J].ACI Structural Journal,1995,92(2):167―176.
[6]李庆华,徐世烺.超高韧性复合材料控裂功能梯度复合梁弯曲性能试验研究[J].中国科学(E辑:技术科学),2009,39(8):1391―1406.Li Qinghua,Xu Shilang.Experimental investigation and analysis on flexural performance of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites[J].Science in China Series E:Technological Sciences,2009,52(6):1648―1664.(in Chinese)
[7]徐世烺,李庆华.超高韧性复合材料控裂功能梯度复合梁弯曲性能理论研究[J].中国科学(E辑:技术科学),2009,39(6):1081―1094.Xu Shilang,Li Qinghua.Theoretical analysis on bending behavior of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites[J].Science in China Series E:Technological Sciences,2009,52(2):363―378.(in Chinese)
[8]Kim Y Y,Fischer G,Li V C.Performance of bridge deck link slabs designed with ductile engineered cementitious composite[J].ACI Structural Journal,2004,101(6):792―801.
[9]Kanda T,Watanabe S,Li V C.Application of pseudo strain hardening cementitious composites to shear resistant structural elements[C]//.Proceedings FRAMCOS-3.Freiburg:Aedificatio Publishers,1998:1477―1490.
[10]Fischer G,Fukuyama H,Li V C.Effect of matrix ductility on the performance of reinforced ECC column members under reversed cyclic loading conditions[C]//Proceedings of the JCI International Workshop on Ductile Fiber Reinforced Cementitious Composites(DFRCC).Tokyo:Japan Concrete Institute,2002:269―278.
[11]Parra-Montesinos G,Wight J K.Seismic response of exterior RC column-to-steel beam connections[J].ASCE Journal of Structural Engineering,2000,126(10):1113―1121.
[12]Fischer G,Li V C.Intrinsic response control of moment resisting frames utilizing advanced composite materials&structural elements[J].ACI Structural Journal,2003,100(2):166―176.
[13]Fukuyama H,Suada H.Experimental response of HPFRCC dampers for structural control[J].Journal of Advanced Concrete Technology,2003,1(3):317―326.
[14]Canbolat B A,Parra-Montesinos G J,Wight J K.Experimental study on the seismic behavior of high-performance fiber reinforced cement composite coupling beams[J].ACI Structural Journal,2005,102(1):159―166.
[15]Li V C,Wang S X.Flexural behaviors of glass fiber-reinforced polymer(GFRP)reinforced engineered cementitious composite beams[J].ACI Materials Journal,2002,99(1):11―21.
[16]Rokugo K,Kunieda M,Kamada T,et al.Structural applicationa of strain hardening type DFRCC as tesion carrying material[C]//Proceedings of the JCI International Workshop on Ductile Fiber Reinforced Cementitious Composites(DFRCC).Tokyo:Japan Concrete Institute,2002:249―258.
[17]GB/T 50081―2002,普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2003.GB/T 50081―2002,Standard for test method of mechanical properties on ordinary concrete[S].Beijing:China Architecture&Building Press,2003.(in Chinese)
[18]陈肇元,朱金铨,吴佩刚,等.高强混凝土及其应用[M].北京:清华大学出版社,1992:69―73.Chen Zhaoyuan,Zhu Jinquan,Wu Peigang,el al.High strength concrete and its applications[M].Beijing:Tsinghua University Press,1992:69―73.(in Chinese)
[19]程文瀼,王铁城,颜德姮.混凝土结构上混凝土结构设计原理第5版[M].北京:中国建筑工业出版社,2012:41―45.Cheng Wenrang,Wang Tiecheng,Yan Deheng.Concrete structures-volume I:Design principles of concrete structures,the fifth edition[M].Beijing:China Architecture&Building Press,2012:41―45.(in Chinese)
[20]李庆华,徐世烺.超高韧性水泥基复合材料在受弯构件中应用研究[J].工程力学,2010,27(增刊2):235―239.Li Qinghua,Xu Shilang.Application of ultra high toughness cementitious composites in flexural members[J].Engineering Mechanics,2010,27(Suppl2):235―239.(in Chinese)