| 机械连接预应力实心方桩承台节点抗震性能试验研究 |
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| 引用本文： | 孙传智,缪长青,李爱群,,鲜铖,朱方之.机械连接预应力实心方桩承台节点抗震性能试验研究[J].世界地震工程,2019,35(4):039-49. |
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| 作者姓名： | 孙传智 缪长青 李爱群 鲜铖 朱方之 |
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| 作者单位： | 1. 宿迁学院 建筑工程学院, 宿迁 223800;2. 东南大学 土木工程学院, 南京 210096;3. 北京建筑大学, 北京 100044 |
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| 摘 要： | 预应力管桩在高烈度抗震设防地区已禁用，而普通钢筋混凝土方桩成本较高。首先针对卡扣式机械连接预应力混凝土实心方桩、PHC管桩和普通钢筋混凝土方桩与承台处的节点进行拟静力试验，并利用试验数据针对Park-Ang损伤模型进行了修正，进行了损伤指数分析。研究结果表明:预应力方桩比普通钢筋混凝土方桩的抗裂性能明显好，而预应力混凝土实心方桩承台节点耗能能力和延性低于预应力管桩和普通钢筋混凝土方桩；截桩施工导致桩端部损失部分预应力，相比较未截桩试件屈服荷载和极限荷载均减小，节点裂缝开展较早，损伤较未截桩试件严重；增配普通钢筋试件的滞回曲线比较饱满，水平承载能力和位移延性得到提升，节点抗震性能得到提升与改善；预应力混凝土实心方桩损伤前期较小，而一旦发生损伤后，损伤指数发展较快。
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| 关 键 词： | 机械连接 预应力实心方桩 低周反复试验 抗震性能 损伤指数 |
Experimental study on seismic performance of prestressed concrete solid pile using mechanical connection |
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| SUN Chuanzhi,MIAO Changqing,LI Aiqun,' target="_blank" rel="external">,XIAN Cheng,ZHU Fangzhi.Experimental study on seismic performance of prestressed concrete solid pile using mechanical connection[J].World Information On Earthquake Engineering,2019,35(4):039-49. |
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| Authors: | SUN Chuanzhi MIAO Changqing LI Aiqun " target="_blank">' target="_blank" rel="external"> XIAN Cheng ZHU Fangzhi |
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| Affiliation: | 1. School of Civil Engineering and Architecture, Suqian College, Suqian 223800, China;2. School of Civil Engineering, Southeast University, Nanjing 210096, China;3. Beijing University of Civil Engineering and Architecture, Beijing 100044, China |
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| Abstract: | The prestressed pipe piles have been banned in high seismic fortification intensity areas, while the ordinary reinforced concrete square piles have higher costs. The cap-pile joints were tested under low frequency cyclic loading for the prestress concrete solid square pile, PHC pipe pile and reinforced concrete square pile. The experimental data were used to modify the Park-Ange damage model and the damage index was analyzed. The results show that the prestressed square piles have better crack resistance performance than the common reinforced concrete square piles, while the energy dissipation capacity and ductility of prestressed square piles are lower than the prestressed tube piles and common reinforced concrete square piles. The prestress loss is caused by the end pile cutting, the reduced yield load and the ultimate load, the earlier crack of the node as well as more serious damage than the uncut pile specimen. The addition of the ordinary steel bars makes the hysteresis curve of the prestressed square piles fuller, the horizontal strength and ductility increased and the performance of the node improved. The prestressed concrete solid square pile presents less damage when the loading displacement is small, and once the damage occurs, the damage index develops rapidly. |
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| Keywords: | mechanical connection prestressed concrete solid pile cyclic loading test seismic performance damage index |
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