PHC管桩抗震性能及其改善措施的试验研究
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摘要
对PHC管桩进行低周往复荷载作用下的抗震性能试验发现,PHC管桩会发生变形且延性不足。为改善其抗震性能,特对PHC管桩在模拟地震力作用下的受力状态、破坏机理进行了分析,并实施了二项改善措施。结果表明,影响PHC管桩在地震力作用下受弯状态抗震性能的主要因素为受力纵筋的变形能力,配置一定量的非预应力筋可明显改善PHC管桩的变形、延性、刚度退化等抗震性能,使高强混凝土的高承载性能得以充分利用。
Bases on the cyclic loading test on the PHC Pile specimens,it finds hat PHC piles have no enough aseismic stability in deformation and ductility.For improving aseismic behavior of PHC piles,the force state and failure mechanism of the piles under imitation seismic action were analyzed.Two improvement measures of serismic behavior of PHC piles are carried out.The results indicate that the aseismic behavior of PHC piles is mainly influenced by the deformation capacity of the longitudinal steel bars.And by adding non-prestressed steel bars to PHC piles,their behaviors in deformation,ductility and stiffness degradation can be improved,and it makes full use of the high bearing of PHC.
Bases on the cyclic loading test on the PHC Pile specimens,it finds hat PHC piles have no enough aseismic stability in deformation and ductility.For improving aseismic behavior of PHC piles,the force state and failure mechanism of the piles under imitation seismic action were analyzed.Two improvement measures of serismic behavior of PHC piles are carried out.The results indicate that the aseismic behavior of PHC piles is mainly influenced by the deformation capacity of the longitudinal steel bars.And by adding non-prestressed steel bars to PHC piles,their behaviors in deformation,ductility and stiffness degradation can be improved,and it makes full use of the high bearing of PHC.
引文
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[6]苏州混凝土水泥制品研究院,苏州中材建筑建材设计研究院.GB13476-2009先张法预应力混凝土管桩[S].北京:中国标准出版社,2009.
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[8]刘宁.预应力混凝土管桩水平承载力现场试验及数值模拟[D].太原:太原理工大学,2011.
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[2]曾庆响.预应力高强混凝土管桩正截面受弯性能试验研究[J].建筑结构,2010,40(4):114-116.
[3]卓维松.PHC管桩水平荷载作用下承载力研究[J].混凝土与水泥制品,2009(3):26-28.
[4]C.M.Tam,Thomas K.L.Tong,Tony C.T.Lau,et al.Diagnosisof prestressed concrete pile defects using probabilistic neuralnetworks[J].Engineering Structures,2004(26):1155-1162.
[5]刘惠珊.桩基震害及原因分析——日本阪神大地震的启示[J].工程抗震,1999(1):37-43.
[6]苏州混凝土水泥制品研究院,苏州中材建筑建材设计研究院.GB13476-2009先张法预应力混凝土管桩[S].北京:中国标准出版社,2009.
[7]吴永红,李连营,陈敖宜,等.天津地标DB29-110—2010预应力混凝土管桩技术规程[S].2010.
[8]刘宁.预应力混凝土管桩水平承载力现场试验及数值模拟[D].太原:太原理工大学,2011.
[9]中国建筑科学研究院.JGJ101—96建筑抗震试验规程[S].北京:中国建筑工业出版社.1997.
[10]柳炳康.预应力填芯管桩抗弯性能与延性特征的试验[J].工业建筑,2007,37(3):46-49.
[11]富文权.预应力混凝土管桩的抗震问题[J].混凝土与水泥制品,1995(1):34-38.
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