体内预应力胶合木梁短期受弯性能试验研究
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摘要
为研究体内预应力胶合木梁短期受弯性能,对15根胶合木梁进行了受弯试验研究,包括1组未增强试件、1组直线形有黏结预应力筋增强试件、2组抛物线形有黏结预应力筋增强试件以及3组抛物线形无黏结预应力筋增强试件。试验结果表明:为布置抛物线形预应力筋,该文首次提出的胶合木梁中抛物线形孔道的开槽方案效果良好,注胶密实性较好;预应力筋增强试件中,摩擦系数?的试验均值为0.0030,?的试验均值为0.10;相比未增强试件,直线形有黏结预应力筋增强试件的受弯极限承载力提高了33.2%,抗弯刚度提高了27.2%,抛物线形有黏结预应力筋增强试件的受弯极限承载力分别提高了29.9%和50.1%,抗弯刚度分别提高了28.9%和30.8%,抛物线形无黏结预应力筋增强试件的受弯极限承载力分别提高了23.7%、32.3%和7.9%,抗弯刚度分别提高了17.3%、18.8%和20.4%;抛物线形预应力筋增强试件相对于直线形受弯极限承载力略有降低,有黏结预应力筋试件相对于无黏结短期受弯性能更好;增大张拉控制应力能有效提高构件受弯极限承载力,但对抗弯刚度的提高贡献不大。
A total of 15 glulam beams, including a group of unreinforced glulam beams, a group of straight-bonded prestressed glulam beams, two groups of parabolic-bonded prestressed glulam beams and three groups of parabolic-unbonded prestressed glulam beams, were tested to study their short-term flexural behaviors.The experimental results showed that the curved slot manufacturing method and gluing process were effective and strong strand-laminate bonds were realized. For prestressed glulam beams, the average value of friction coefficient k was 0.0030, and the average value of m was 0.10. Compared to the unreinforced glulam beams, the ultimate bearing capacity of straight-bonded prestressed glulam beams increased by 33.2%, the flexural stiffness increased by 27.2%. For parabolic-bonded prestressed glulam beams, the ultimate bearing capacity may be increased by 29.9% and 50.1% respectively, the flexural stiffness increased by 28.9% and 30.8% respectively. For parabolic-unbonded prestressed glulam beams, the ultimate bearing capacity increased by 23.7%, 32.3% and 7.9% respectively, the flexural stiffness increased by 17.3%, 18.8% and 20.4% respectively. The ultimate bearing capacity of curved prestressed glulam beams was slightly lower than that of straight prestressed glulam beams,and the bonded prestressed glulam beams showed better flexural behavior than the unbonded ones. Moreover, it was found that the increase of tensioning stress effectively improved the ultimate bearing capacity but contributed little to the improvement of flexural stiffness.
A total of 15 glulam beams, including a group of unreinforced glulam beams, a group of straight-bonded prestressed glulam beams, two groups of parabolic-bonded prestressed glulam beams and three groups of parabolic-unbonded prestressed glulam beams, were tested to study their short-term flexural behaviors.The experimental results showed that the curved slot manufacturing method and gluing process were effective and strong strand-laminate bonds were realized. For prestressed glulam beams, the average value of friction coefficient k was 0.0030, and the average value of m was 0.10. Compared to the unreinforced glulam beams, the ultimate bearing capacity of straight-bonded prestressed glulam beams increased by 33.2%, the flexural stiffness increased by 27.2%. For parabolic-bonded prestressed glulam beams, the ultimate bearing capacity may be increased by 29.9% and 50.1% respectively, the flexural stiffness increased by 28.9% and 30.8% respectively. For parabolic-unbonded prestressed glulam beams, the ultimate bearing capacity increased by 23.7%, 32.3% and 7.9% respectively, the flexural stiffness increased by 17.3%, 18.8% and 20.4% respectively. The ultimate bearing capacity of curved prestressed glulam beams was slightly lower than that of straight prestressed glulam beams,and the bonded prestressed glulam beams showed better flexural behavior than the unbonded ones. Moreover, it was found that the increase of tensioning stress effectively improved the ultimate bearing capacity but contributed little to the improvement of flexural stiffness.
引文
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[2]Sliker A.Reinforced wood laminated beams[J].Forest Produce,1962,3(6):91-96
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[4]Triantafillou T C,Deskovic N.Prestressed FRP sheets as external reinforcement of wood members[J].Journal of Structural Engineering,1992,118(5):1270-1284
[5]Plevris N,Triantafillou T C.FRP-reinforced wood as structural material[J].Journal of materials in Civil Engineering,1992,4(3):300-317
[6]Dolan C W,Galloway T L,Tsunemori A.Prestressed glued-laminated timber beam-pilot study[J].Journal of Composites for Construction,1997,1(1):10-16
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[9]De Luca V,Marano C.Prestressed glulam timbers reinforced with steel bars[J].Construction and Building Materials,2012,30:206-217
[10]McConnell E,McPolin D,Taylor S.Post-tensioning of glulam timber with steel tendons[J].Construction and Building Materials,2014,73:426-433
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[12]Yang H,Liu W,Lu W,et al.Flexural behavior of FRPand steel reinforced glulam beams:experimental and theoretical evaluation[J].Construction and Building Materials,2016,106:550-563
[13]林诚,杨会峰,刘伟庆,等.预应力胶合木梁的受弯性能试验研究[J].结构工程师,2014,30(1):160-164(Lin Cheng,Yang Huifeng,Liu Weiqing,et al.Experimental study on the flexural behavior of prestressed glulam beams[J].Structural Engineers,2014,30(1):160-164(in Chinese))
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[15]Yang H,Ju D,Liu W,et al.Prestressed glulam beams reinforced with CFRP bars[J].Construction&Building Materials,2016,109:73-83
[16]GB/T 21839-2008预应力混凝土用钢材试验方法[S].北京:中国标准出版社,2008(GB/T 21839-2008 Steel for prestressed concrete-Test methods[S].Beijing:Standards Press of China,2008(in Chinese))
[17]GB/T 228.1-2010金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010(GB/T228.1-2010 Metallic materials-tensile testing-part 1:method of test at room temperature[S].Beijing:Standards Press of China,2010(in Chinese))
[18]曹艳超.预应力混凝土梁孔道压浆效果检测技术及应用[D].石家庄:石家庄铁道大学,2015(Cao Yanchao.Testing technology and application of the duct grouting effects in the prestressed concrete beam[D].Shijiazhuang:Shijiazhuang Tiedao University,2015(in Chinese))
[19]周勇政.沥青基灌浆技术在后张预应力结构中的应用及试验研究[D].北京:北京交通大学,2015(Zhou Yongzheng.Application and experimental study on bitumen-based grouting technology for post-tensioned prestressed structures[D].Beijing:Beijing Jiaotong University,2015(in Chinese))
[20]GB/T 50329-2012木结构试验方法标准[S].北京:中国建筑工业出版社,2012(GB/T 50329-2012 Standard method for test methods of timber structures[S].Beijing:China Architecture&Building Press,2012(in Chinese))
[21]GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2015(GB 50010-2010 Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2015(in Chinese))
[22]陆伟东,刘伟庆,耿启凡,等.竖嵌CFRP板条层板增强的胶合木梁受弯性能研究[J].建筑结构学报,2014,35(8):151-157(Lu Weidong,Liu Weiqing,Geng Qifan,et al.Study on flexural behavior of glued laminated timber beams reinforced with vertical CFRP lath inlay[J].Journal of Building Structures,2014,35(8):151-157(in Chinese))
[2]Sliker A.Reinforced wood laminated beams[J].Forest Produce,1962,3(6):91-96
[3]Peterson J.Wood beams prestressed with bonded tension elements[J].Journal of the Structural Division,1965,91(1):103-120
[4]Triantafillou T C,Deskovic N.Prestressed FRP sheets as external reinforcement of wood members[J].Journal of Structural Engineering,1992,118(5):1270-1284
[5]Plevris N,Triantafillou T C.FRP-reinforced wood as structural material[J].Journal of materials in Civil Engineering,1992,4(3):300-317
[6]Dolan C W,Galloway T L,Tsunemori A.Prestressed glued-laminated timber beam-pilot study[J].Journal of Composites for Construction,1997,1(1):10-16
[7]Galloway T L,Fogstad C,Dolan C W,et al.Initial tests of kevlar prestressed timber beams[C]//Proceedings of National Conference on Wood Transportation Structures,Forest Products Laboratory,USDA Forest Service,Madison,WI.1996:215-224
[8]Borri A,Corradi M,Grazini A.A method for flexural reinforcement of old wood beams with CFRP materials[J].Composites Part B:Engineering,2005,36(2):143-153
[9]De Luca V,Marano C.Prestressed glulam timbers reinforced with steel bars[J].Construction and Building Materials,2012,30:206-217
[10]McConnell E,McPolin D,Taylor S.Post-tensioning of glulam timber with steel tendons[J].Construction and Building Materials,2014,73:426-433
[11]杨会峰,刘伟庆.FRP增强胶合木梁的受弯性能研究[J].建筑结构学报.2007,28(1):64-71(Yang Huifeng,Liu Weiqing.Study on flexural behavior of FRPreinforced glulam beams[J].Journal of Building Structures,2007,28(1):64-71(in Chinese))
[12]Yang H,Liu W,Lu W,et al.Flexural behavior of FRPand steel reinforced glulam beams:experimental and theoretical evaluation[J].Construction and Building Materials,2016,106:550-563
[13]林诚,杨会峰,刘伟庆,等.预应力胶合木梁的受弯性能试验研究[J].结构工程师,2014,30(1):160-164(Lin Cheng,Yang Huifeng,Liu Weiqing,et al.Experimental study on the flexural behavior of prestressed glulam beams[J].Structural Engineers,2014,30(1):160-164(in Chinese))
[14]杨会峰,朱文祥,郝建东,等.体外预应力胶合木梁抗弯性能试验研究[J].南京工业大学学报:自然版,2016,38(5):68-73(Yang Huifeng,Zhu Wenxiang,Hao Jiandong,et al.Experimental study on the flexural behaviors of external prestressed glulam beams[J].Journal of Nanjing Tech University:Natural Edition,2016,38(5):68-73(in Chinese))
[15]Yang H,Ju D,Liu W,et al.Prestressed glulam beams reinforced with CFRP bars[J].Construction&Building Materials,2016,109:73-83
[16]GB/T 21839-2008预应力混凝土用钢材试验方法[S].北京:中国标准出版社,2008(GB/T 21839-2008 Steel for prestressed concrete-Test methods[S].Beijing:Standards Press of China,2008(in Chinese))
[17]GB/T 228.1-2010金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010(GB/T228.1-2010 Metallic materials-tensile testing-part 1:method of test at room temperature[S].Beijing:Standards Press of China,2010(in Chinese))
[18]曹艳超.预应力混凝土梁孔道压浆效果检测技术及应用[D].石家庄:石家庄铁道大学,2015(Cao Yanchao.Testing technology and application of the duct grouting effects in the prestressed concrete beam[D].Shijiazhuang:Shijiazhuang Tiedao University,2015(in Chinese))
[19]周勇政.沥青基灌浆技术在后张预应力结构中的应用及试验研究[D].北京:北京交通大学,2015(Zhou Yongzheng.Application and experimental study on bitumen-based grouting technology for post-tensioned prestressed structures[D].Beijing:Beijing Jiaotong University,2015(in Chinese))
[20]GB/T 50329-2012木结构试验方法标准[S].北京:中国建筑工业出版社,2012(GB/T 50329-2012 Standard method for test methods of timber structures[S].Beijing:China Architecture&Building Press,2012(in Chinese))
[21]GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2015(GB 50010-2010 Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2015(in Chinese))
[22]陆伟东,刘伟庆,耿启凡,等.竖嵌CFRP板条层板增强的胶合木梁受弯性能研究[J].建筑结构学报,2014,35(8):151-157(Lu Weidong,Liu Weiqing,Geng Qifan,et al.Study on flexural behavior of glued laminated timber beams reinforced with vertical CFRP lath inlay[J].Journal of Building Structures,2014,35(8):151-157(in Chinese))
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