| Civil and Transportation Engineering |
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| Flexural performance experiment of composite reinforcement |
| XU Quan biao, CHEN Gang, HE Jing feng, GONG Shun feng |
1. The Architectural Design and Research Institute of Zhejiang University Co. Ltd, Hangzhou 310028, China;
2. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China |
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Abstract The composite reinforcement concrete prefabricated square piles were innovatively developed to improve the anti-cracking performance of common concrete prefabricated square piles; the horizontal load-carrying capacity and deformation ductility of the prestressed concrete pipe piles. The experiments of flexural performance of nine square pile specimens for three kinds of commonly-used pile types were conducted to investigate the differences between prestressed and non-prestressed concrete prefabricated square piles on aspects of anti-cracking performance, flexural capacity, deformation ductility and damage characteristics. Results show that the applied prestress can evidently improve the anti-cracking capacity of square piles, and the crack distribution of the pile concrete is more uniform and its distribution range is smaller. Simultaneously, the number of crack in pile body is much less and the cracking bending moment becomes larger. In addition, the experimental results of ultimate flexural bearing capacity for square pile specimens are far greater than the calculated values from the specification formula. As to the prestressed square pile specimens, the ultimate flexural bearing capacity reduces 15% or so and the deformation ductility decreases approximately 30% in comparison with the non-prestressed ones. The failure mode of the composite reinforcement concrete prefabricated square pile specimens can be described as follows: the non-prestressed rebar of the tension zone first starts to yield, then the prestressed steel bar is tensioned to fracture, finally the concrete in the compression zone is crushed．
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Published: 22 September 2016
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复合配筋混凝土预制方桩抗弯性能试验
为解决普通混凝土预制方桩抗裂性能差、预应力混凝土管桩水平承载力低和变形延性差的现状,创新研发复合配筋混凝土预制方桩.通过3种常用桩型9根方桩试件足尺度抗弯性能试验,研究预应力和非预应力混凝土预制方桩在抗裂性能、抗弯承载力、变形延性及破坏特征等方面的差异.结果表明：施加预应力显著提高了方桩的抗裂性能,桩身混凝土裂缝分布范围小且更均匀,裂缝数目更少,开裂弯矩更大；方桩试件的极限抗弯承载力试验值远大于规范公式计算值,施加预应力比未施加预应力方桩试件的极限抗弯承载力减小15%左右,变形延性降低约30%|复合配筋混凝土预制方桩试件的破坏形式如下：受拉区非预应力钢筋首先屈服,受拉区预应力钢筋被拉断,最后受压区混凝土被压碎.
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