地震作用下管桩模型的内力分布研究
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摘要
目前针对预应力混凝土管桩的地震内力分布研究较少,缺乏管桩的应用机理。管桩内力研究,对于了解桩基承载性状和桩土作用机理,进行工程优化设计至关重要。通过振动台试验对双桩进行了内力分布研究,分析了不同工况变化时对桩身内力分布的影响。结果表明管桩内力分布跟上部结构、激振频率以及激振强度都有直接的关系。在各种工况作用下,模型管桩在距离桩顶4～6倍桩径处弯矩最大,距离桩顶20倍桩径左右处往下弯矩变化较小且趋于平稳。试验结果为后续理论研究提供了依据,为工程设计提供了参考。
There are few studies about the earthquake internal force distribution of prestressed concrete pipe piles and lack of pipe pile application mechanism.Pile internal forces research plays an important role in understanding the pile bearing behavior,mechanism action of pile-soil and optimum engineering design.Based on the analysis of double piles internal force distribution with the shaking table test,the impact on the internal force distribution of the piles under different operating conditions is analyzed.The results show that the pile internal force distribution keeps a direct relationship with the upper part of the structure,the excitation frequency and excitation intensity.Under various operating conditions,the maximum moment of pipe piles model is at a distance of 4-6 times the pile diameter from pipe piles top,and from the top of the pile about 20 times the pile diameter down the moment change is small and stabilized.The results provide a basis for further theoretical study and a reference for engineering design.
There are few studies about the earthquake internal force distribution of prestressed concrete pipe piles and lack of pipe pile application mechanism.Pile internal forces research plays an important role in understanding the pile bearing behavior,mechanism action of pile-soil and optimum engineering design.Based on the analysis of double piles internal force distribution with the shaking table test,the impact on the internal force distribution of the piles under different operating conditions is analyzed.The results show that the pile internal force distribution keeps a direct relationship with the upper part of the structure,the excitation frequency and excitation intensity.Under various operating conditions,the maximum moment of pipe piles model is at a distance of 4-6 times the pile diameter from pipe piles top,and from the top of the pile about 20 times the pile diameter down the moment change is small and stabilized.The results provide a basis for further theoretical study and a reference for engineering design.
引文
[1]阮起楠.地震区预应力混凝土管桩设计探讨[J].混凝土与水泥制品,2000,(4):23～28.
[2]Philip James Meymand,Shaking Table Scale Model Tests ofNonlinear Soil-Pile-Superstructure Interaction in Soft Clay[D].UMI,Fall 1998.
[3]黄春霞,张鸿儒,隋志龙.大型剪切变形模型箱的研制[J].岩石力学与工程学报,2006,(10):2128～2134.
[2]Philip James Meymand,Shaking Table Scale Model Tests ofNonlinear Soil-Pile-Superstructure Interaction in Soft Clay[D].UMI,Fall 1998.
[3]黄春霞,张鸿儒,隋志龙.大型剪切变形模型箱的研制[J].岩石力学与工程学报,2006,(10):2128～2134.
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