混合配筋管桩拟静力试验研究
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摘要
对PHC管桩和不同配筋强度比的PRC管桩进行拟静力试验研究,并使用弹簧来模拟桩周土作用。参考天津滨海新区地质条件设置弹簧参数,使之更符合实际的受力性能。分析试验得到的滞回曲线、骨架曲线和耗能能力等来研究管桩在往复荷载作用下的抗震性能,找到非预应力钢筋和预应力钢筋的最佳配筋强度比。结果表明,PRC管桩滞回曲线更饱满,延性更好;增加非预应力钢筋能改善PHC管桩延性,而非预应力钢筋配筋率过大也会造成混凝土在钢筋屈服前被压碎,非预应力钢筋和预应力钢筋的配筋强度比应保持在0.4～0.8之间。
Pseudo static tests of PHC pipe piles and PRC pipe piles with different reinforcement ratios were carried out, and the spring was used to simulate soil action around piles. The spring parameters were set up according to the geological conditions of Tianjin Binhai New Area to make it more consistent with the actual mechanical performance. The seismic behavior of pipe pile under cyclic loading was studied by hysteretic curve, skeleton curve and energy dissipation capacity from the test, and the optimum reinforcement strength ratio of non-prestressing steel bar and prestressing steel bar was obtained. The results show that PRC pipe pile has fuller hysteretic curve and better ductility. Increasing the non-prestressing steel bar can improve the ductility of PHC pipe pile. The excessive reinforcement ratio of non-prestressing steel bar will also cause the concrete to be crushed before the steel bar yields. The strength ratio of non-prestressing steel bar and prestressing steel bar should be kept between 0.4～0.8.
Pseudo static tests of PHC pipe piles and PRC pipe piles with different reinforcement ratios were carried out, and the spring was used to simulate soil action around piles. The spring parameters were set up according to the geological conditions of Tianjin Binhai New Area to make it more consistent with the actual mechanical performance. The seismic behavior of pipe pile under cyclic loading was studied by hysteretic curve, skeleton curve and energy dissipation capacity from the test, and the optimum reinforcement strength ratio of non-prestressing steel bar and prestressing steel bar was obtained. The results show that PRC pipe pile has fuller hysteretic curve and better ductility. Increasing the non-prestressing steel bar can improve the ductility of PHC pipe pile. The excessive reinforcement ratio of non-prestressing steel bar will also cause the concrete to be crushed before the steel bar yields. The strength ratio of non-prestressing steel bar and prestressing steel bar should be kept between 0.4～0.8.
引文
[1] IKEDA S,TSUBAKI T,YAMAGUCHI T.Ductility improvement of prestressed concrete piles[J].Transactions of the Japan Concrete Institue,1982,4:531-538.
[2] MUGURUMA H,WATANABE F,NISHIYAMA M.Improving the flexural ductility of pretensioned high strength spun concrete piles by lateral confining of concrete[C]//Proceedings of the Pacific Conference on Earthquake Engineering.Wairakei,1987:385-396.
[3] 王铁成,王文进,赵海龙,等.不同高强预应力管桩抗震性能的试验对比[J].工业建筑,2014,44(7):84-89.
[4] 宋永生,陶文成,杨博,等.局部加强型预应力管桩抗弯试验与设计计算方法研究[J].建筑结构,2017,47(9):80-84.
[5] 戎贤,王旭月,李艳艳.掺入钢纤维的PHC管桩抗震性能试验研究[J].建筑结构,2014,44(8):10-14.
[6] 王新玲,杜琳,黄伟东.混合配筋预应力混凝土管桩抗弯刚度模型研究[J].郑州大学学报(工学版),2013,34(6):80-84.
[7] 王新玲,冯香玲.混合配筋新型预应力混凝土管桩抗弯性能研究[J].施工技术,2012,41(371):118-122.
[8] 王铁成,杜宙芳,赵海龙,等.混合配筋管桩的抗震性能试验研究[J].土木工程与管理学报,2015,32(3):27-32.
[9] 韩理安.水平荷载桩的计算[M].长沙:中南大学出版社,2004:9.
[10] 建筑抗震试验规程:JGJ/T 101—2015[S].北京:中华人民共和国住房和城乡建设部,2015.
[2] MUGURUMA H,WATANABE F,NISHIYAMA M.Improving the flexural ductility of pretensioned high strength spun concrete piles by lateral confining of concrete[C]//Proceedings of the Pacific Conference on Earthquake Engineering.Wairakei,1987:385-396.
[3] 王铁成,王文进,赵海龙,等.不同高强预应力管桩抗震性能的试验对比[J].工业建筑,2014,44(7):84-89.
[4] 宋永生,陶文成,杨博,等.局部加强型预应力管桩抗弯试验与设计计算方法研究[J].建筑结构,2017,47(9):80-84.
[5] 戎贤,王旭月,李艳艳.掺入钢纤维的PHC管桩抗震性能试验研究[J].建筑结构,2014,44(8):10-14.
[6] 王新玲,杜琳,黄伟东.混合配筋预应力混凝土管桩抗弯刚度模型研究[J].郑州大学学报(工学版),2013,34(6):80-84.
[7] 王新玲,冯香玲.混合配筋新型预应力混凝土管桩抗弯性能研究[J].施工技术,2012,41(371):118-122.
[8] 王铁成,杜宙芳,赵海龙,等.混合配筋管桩的抗震性能试验研究[J].土木工程与管理学报,2015,32(3):27-32.
[9] 韩理安.水平荷载桩的计算[M].长沙:中南大学出版社,2004:9.
[10] 建筑抗震试验规程:JGJ/T 101—2015[S].北京:中华人民共和国住房和城乡建设部,2015.
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