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工程力学  2013 

体外预应力混凝土连续梁的弯矩重分布试验研究

DOI: 10.6052/j.issn.1000-4750.2011.11.0725, PP. 263-269

Keywords: 桥梁工程,弯矩重分布,加载试验,混凝土连续梁,体外预应力

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Abstract:

进行了3根体外预应力混凝土两跨连续梁受力全过程试验。试验表明,自加载至受拉区混凝土开裂前,连续梁处于弹性阶段,边支座、中支座反力、跨中截面和中支座截面弯矩的实测值与采用弹性理论计算值接近。受拉区混凝土开裂后至非预应力受拉钢筋屈服,边支座反力及跨中截面弯矩实测值开始向大于弹性理论计算值的方向偏离;而中支座反力及中支座截面弯矩实测值则向小于弹性理论计算值的方向偏离。当梁内受拉非预应力筋屈服后,边支座、中支座反力的实测值以及跨中截面弯矩和中支座截面弯矩实测值与弹性理论计算值的偏差进一步增大,这种偏差在试验梁破坏时达到最大。3根试验梁中支座截面弯矩重分布值分别为12.8%、16.9%及14.6%。试验实测值还与4个不同设计规范的弯矩重分布计算值进行了比较。结果表明:采用美国ACI318-95规范及中国GB50010-2010规范计算的中支座截面弯矩重分布值均小于试验实测值;除一根编号为B5的梁外,加拿大A23.3-M84规范的预测值与试验值最为接近;而英国BS8110规范则偏于不安全。实际设计中,可按中国规范公式来计算体外预应力混凝土连续梁的弯矩重分布,但必须合理确定体外预应力筋的极限应力。

References

[1]  Fischer G, Li V C. Deformation behavior of fiber-reinforced polymer reinforced engineered cementitious composite (ECC) flexural members under reversed cyclic loading conditions [J]. ACI Structural Journal, 2003, 100(1): 25―35.
[2]  Kodur V K R, Campbell T I. Evaluation of moment redistribution in a two-Span continuous prestressed concrete beam [J]. ACI Structural Journal, 1996, 93(6): 721―728.
[3]  Park R, Paulay T. Reinforced concrete structures [M]. The United States of America: John Wiley & Sons, 1975.
[4]  Priestley M J N, Kowalsky M J. Direct Displacement- based seismic design of concrete buildings [J]. Bulletion of the New Zealand Society for Earthquake Engineering, 2000, 33(4): 421―444.
[5]  Wyche P J, Uren J G, Reynolds G C. Interaction between prestress secondary moments, moment redistribution, and ductility-a treatise on the Australian concrete codes [J]. ACI Structural Journal, 1993, 89(1): 57―70.
[6]  钱稼茹, 程丽荣, 周栋梁. 普通箍筋约束混凝土柱的中心受压性能[J]. 清华大学学报, 2002, 42(10): 1369―1373.
[7]  ACI Committee 318, Building code requirements for structural concrete (ACI 318-95) and commentary (318R-95) [S]. Farmington Hills, Michigan, USA: American Concrete Institute, 1995: 369.
[8]  Qian Jiaru, Cheng Lirong, Zhou Dongliang. Behavior of axially loaded concrete columns confined with ordinary hoops [J]. Journal of Tsinghua University, 2002, 42(10): 1369―1373. (in Chinese)
[9]  Architectural Institute of Japan. AIJ structural Japanese design guidelines for reinforced concrete building [S]. Japan, 1990: 77―123.
[10]  Canadian Standards Association. Code for the design of concrete structures for buildings (CAN3-A23.3-M84) [S]. Rexdale, Ontario, Canada, 1984: 281.
[11]  British Standards Institution. The structural use of concrete: Part 1, code of practice for design and construction [S]. 389 Chiswick High Road, London, UK: British Standards Institution, 1985: 99.
[12]  GB 50010-2010, 混凝土结构设计规范[S]. 北京: 中国建筑工业出版社, 2010.
[13]  GB 50010-2010, Code for design of concrete structures [S]. Beijing: China Architecture and Building Press, 2010. (in Chinese)
[14]  Mattock A H, Yamzaki J, Kattula B T. Comparative study of prestressed concrete beams with and without bond [J]. ACI Journal, 1971, 68(2): 116―125.
[15]  Lin T Y, Thornton K. Secondary moment and moment redistribution in continuous prestressed concrete beams [J]. PCI Journal, 1972, 17(1): 8―20.
[16]  ACI Committee 318. Code requirements for reinforced concrete (ACI 318-71) [S]. Farmington Hills, Michigan, USA: American Concrete Institute, 1971: 78.
[17]  Du Jinsheng, Liu Xila. Experimental study of RC continuous beams strengthened by external prestressing [C]// Innovation and sustainability of modern railway: Lei Xiaoyan. Proceedings of ISMR’ 2008. Beijing: China Railway Publishing House, 2008: 221―227.
[18]  Aravinthan T, Witchukreangkrai E, Mutsuyoshi H. Flexural behavior of two-span continuous prestressed concrete girders with highly eccentric external tendons [J]. ACI Structural Journal, 2005, 102(3): 402―411.
[19]  简斌, 白绍良, 王正霖. 预应力混凝土连续梁弯矩调幅的延性要求[J]. 工程力学, 2001, 18(2): 51―57.
[20]  Jian Bin, Bai Shaoliang, Wang Zhenglin. Ductility requirement in the moment redistribution of prestressed concrete continuous beams [J]. Engineering Mechanics, 2001, 18(2): 51―57. (in Chinese)

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