预应力钢绞线超高强混凝土管桩抗剪性能试验研究
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摘要
为解决普通预应力超高强混凝土管桩变形延性差和水平承载力低的现状,创新研发了预应力钢绞线超高强混凝土管桩。通过3种常用桩型6根管桩足尺度试件的抗剪性能试验,对比研究了预应力钢绞线超高强混凝土管桩与普通预应力超高强混凝土管桩在抗剪承载力、变形延性、破坏特征及裂缝开展等方面的差异。结果表明:以钢绞线替代钢棒作为主筋可以有效提高管桩受剪状态下的变形延性和极限承载力;预应力钢绞线超高强混凝土管桩试件裂缝开展更为密集均匀,竖向裂缝的长度较短,横向分叉较多;普通预应力超高强混凝土管桩试件均以预应力钢棒拉断破坏,而预应力钢绞线超高强混凝土管桩试件均以受压区混凝土压碎破坏,抗剪破坏滞后于抗弯破坏。
Ordinary ultra-high strength concrete pipe pile with prestressed steel bar is of low deformation ductility and horizontal load-bearing capacity. To tackle this problem, we replaced the prestressed bar with prestressed steel strand and compared the performances(including shearing capacity, deformation ductility, damage characteristics and cracking pattern) between prestressed steel strand ultra-high strength concrete pipe piles and ordinary prestressed ultra-high strength concrete pipe piles via shearing performance tests on six full-scale pipe pile specimens of three commonly-used pile types. Results evinced that replacing steel bars with steel strands as main reinforcement could effectively improve the deformation ductility and the ultimate load-carrying capacity of pipe piles under shearing condition. The cracks of ultra-high strength concrete pipe pile with prestressed steel strand develop more densely and uniformly, shorter in vertical direction yet with more lateral bifurcations than those of ordinary prestressed ultra-high strength concrete pipe piles. Ordinary prestressed ultra-high strength concrete pipe pile specimens are destructed following the tensile failure of steel bars; the failure of ultra-high strength concrete pipe pile specimens with prestressed steel strand are generated by the crushing failure of compressed concrete zone with shearing failure lagging behind flexural failure.
Ordinary ultra-high strength concrete pipe pile with prestressed steel bar is of low deformation ductility and horizontal load-bearing capacity. To tackle this problem, we replaced the prestressed bar with prestressed steel strand and compared the performances(including shearing capacity, deformation ductility, damage characteristics and cracking pattern) between prestressed steel strand ultra-high strength concrete pipe piles and ordinary prestressed ultra-high strength concrete pipe piles via shearing performance tests on six full-scale pipe pile specimens of three commonly-used pile types. Results evinced that replacing steel bars with steel strands as main reinforcement could effectively improve the deformation ductility and the ultimate load-carrying capacity of pipe piles under shearing condition. The cracks of ultra-high strength concrete pipe pile with prestressed steel strand develop more densely and uniformly, shorter in vertical direction yet with more lateral bifurcations than those of ordinary prestressed ultra-high strength concrete pipe piles. Ordinary prestressed ultra-high strength concrete pipe pile specimens are destructed following the tensile failure of steel bars; the failure of ultra-high strength concrete pipe pile specimens with prestressed steel strand are generated by the crushing failure of compressed concrete zone with shearing failure lagging behind flexural failure.
引文
[1] 闫瑞明,闻建军.软土地区预应力管桩断桩事故的预防与处理[J].土木工程学报,2007,40(增刊1):421-424.
[2] 张忠苗,张乾青,刘俊伟,等.软土地区预应力管桩偏位处理实例分析[J].岩土工程学报,2010,32(6):975-980.
[3] 高文生,刘金砺,赵晓光,等.关于预应力混凝土管桩工程应用中的几点认识[J].岩土力学,2015,36(增刊2):610-616.
[4] 刘小乐.预应力混凝土管桩抗弯性能研究[D].合肥:合肥工业大学,2013.
[5] 俞向阳.将钢绞线安装于端板上的安装套件及安装方法:CN201610021502.1[P].2016-05-04.
[6] 俞晓东.用于制造钢绞线钢筋笼的固定装置及制造设备和制造方法:CN201610020291.X[P].2016-04-06.
[7] 俞向阳.一种具有钢绞线的先张法离心混凝土桩及制造方法:JP6165357B2[P].2017-07-19.
[8] YU Xiang-yang.Pre-tensioned Centrifugal Concrete Pile Provided with Steel Strands:US9783987B2[P].2017-10-10.
[9] 刘永超.预应力混凝土管桩结构性能研究及新桩型开发[D].天津:天津大学,2009.
[10] 亓乐,宋修广,张宏博,等.管桩水平承载特性室内模型试验研究[J].长江科学院院报,2017,34(10):74-78.
[11] 张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪性能试验研究[J].岩土工程学报,2011,33(增刊2):271-277.
[12] 张忠苗,刘俊伟,邹健,等.加强型预应力混凝土管桩抗弯剪性能试验研究[J].浙江大学学报(工学版),2011,45(6):1074-1080.
[13] AKDAG C T,?ZDEN G.Nonlinear Behavior of Reinforced Concrete (RC) and Steel Fiber Added RC (WS-SFRC) Model Piles in Medium Dense Sand [J].Construction and Building Materials,2013,48:464-472.
[14] 郑刚,张天奇,李庆刚,等.考虑剪跨比及截桩填芯影响的PHC管桩抗剪承载力试验研究[J].土木工程学报,2014,47(7):97-109.
[15] 徐铨彪,陈刚,贺景峰,等.复合配筋混凝土预制方桩抗弯性能试验[J].浙江大学学报(工学版),2016,50(9):1768-1776.
[16] 徐铨彪,陈刚,龚顺风,等.复合配筋混凝土预制方桩抗剪性能试验研究[J].工业建筑,2017,47(7):102-108.
[17] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.先张法预应力混凝土管桩:GB 13476—2009 [S].北京:中国标准出版社,2009:7-9.
[18] 中华人民共和国住房和城乡建设部,中国建筑标准设计研究院.预应力混凝土管桩:10G409 [S].北京:中国计划出版社,2010:5-17.
[19] 柯晓军.新型高强混凝土组合柱抗震性能及设计方法研究[D].西安:西安建筑科技大学,2014.
[2] 张忠苗,张乾青,刘俊伟,等.软土地区预应力管桩偏位处理实例分析[J].岩土工程学报,2010,32(6):975-980.
[3] 高文生,刘金砺,赵晓光,等.关于预应力混凝土管桩工程应用中的几点认识[J].岩土力学,2015,36(增刊2):610-616.
[4] 刘小乐.预应力混凝土管桩抗弯性能研究[D].合肥:合肥工业大学,2013.
[5] 俞向阳.将钢绞线安装于端板上的安装套件及安装方法:CN201610021502.1[P].2016-05-04.
[6] 俞晓东.用于制造钢绞线钢筋笼的固定装置及制造设备和制造方法:CN201610020291.X[P].2016-04-06.
[7] 俞向阳.一种具有钢绞线的先张法离心混凝土桩及制造方法:JP6165357B2[P].2017-07-19.
[8] YU Xiang-yang.Pre-tensioned Centrifugal Concrete Pile Provided with Steel Strands:US9783987B2[P].2017-10-10.
[9] 刘永超.预应力混凝土管桩结构性能研究及新桩型开发[D].天津:天津大学,2009.
[10] 亓乐,宋修广,张宏博,等.管桩水平承载特性室内模型试验研究[J].长江科学院院报,2017,34(10):74-78.
[11] 张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪性能试验研究[J].岩土工程学报,2011,33(增刊2):271-277.
[12] 张忠苗,刘俊伟,邹健,等.加强型预应力混凝土管桩抗弯剪性能试验研究[J].浙江大学学报(工学版),2011,45(6):1074-1080.
[13] AKDAG C T,?ZDEN G.Nonlinear Behavior of Reinforced Concrete (RC) and Steel Fiber Added RC (WS-SFRC) Model Piles in Medium Dense Sand [J].Construction and Building Materials,2013,48:464-472.
[14] 郑刚,张天奇,李庆刚,等.考虑剪跨比及截桩填芯影响的PHC管桩抗剪承载力试验研究[J].土木工程学报,2014,47(7):97-109.
[15] 徐铨彪,陈刚,贺景峰,等.复合配筋混凝土预制方桩抗弯性能试验[J].浙江大学学报(工学版),2016,50(9):1768-1776.
[16] 徐铨彪,陈刚,龚顺风,等.复合配筋混凝土预制方桩抗剪性能试验研究[J].工业建筑,2017,47(7):102-108.
[17] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.先张法预应力混凝土管桩:GB 13476—2009 [S].北京:中国标准出版社,2009:7-9.
[18] 中华人民共和国住房和城乡建设部,中国建筑标准设计研究院.预应力混凝土管桩:10G409 [S].北京:中国计划出版社,2010:5-17.
[19] 柯晓军.新型高强混凝土组合柱抗震性能及设计方法研究[D].西安:西安建筑科技大学,2014.