复合配筋混凝土预制方桩接头抗弯性能试验
发布时间：2018-12-17 09:22
【摘要】：为了提高混凝土预制方桩的连接性能,重新设计了桩身的连接接头.通过对3种常用桩型共9根复合配筋混凝土预制方桩接头试件进行足尺度抗弯性能试验,研究方桩连接接头的抗弯承载力、变形延性及破坏特征等.结果表明:方桩接头试件破坏时,桩身混凝土裂缝分布紧密,裂缝竖向发展分叉较多,部分裂缝相互交错;复合配筋混凝土预制方桩接头试件的极限抗弯承载力试验值远大于桩身极限抗弯承载力规范公式的计算值,且都大于50%以上;方桩接头试件破坏形式主要有两种:桩身正截面抗弯破坏和端板与桩身连接破坏,发生桩身正截面抗弯破坏的接头试件具有更好的承载能力和变形性能.
[Abstract]:In order to improve the connection performance of precast concrete square pile, the connection joint of pile body was redesigned. The flexural strength, deformation ductility and failure characteristics of square pile joints were studied by means of foot scale flexural behavior tests of 9 concrete composite reinforced concrete prefabricated square pile joints of three kinds of commonly used piles. The results show that when the specimens of square pile joints are destroyed, the cracks in the pile body are closely distributed, the vertical development and bifurcation of cracks are more, and some cracks are interlaced with each other. The test values of ultimate flexural bearing capacity of composite reinforced concrete prefabricated square pile joints are much larger than the calculated values of the formula of ultimate flexural bearing capacity of pile body, and are more than 50%. There are two kinds of failure modes of square pile joint: bending failure of normal section of pile body and joint failure of end plate and pile body. Joint specimens with bending failure of normal section of pile body have better bearing capacity and deformation performance.
【作者单位】： 浙江大学建筑设计研究院有限公司;浙江大学结构工程研究所;
【基金】：国家自然科学基金资助项目(51479176,51009122)
【分类号】：TU473.13
本文编号：2384015
[Abstract]:In order to improve the connection performance of precast concrete square pile, the connection joint of pile body was redesigned. The flexural strength, deformation ductility and failure characteristics of square pile joints were studied by means of foot scale flexural behavior tests of 9 concrete composite reinforced concrete prefabricated square pile joints of three kinds of commonly used piles. The results show that when the specimens of square pile joints are destroyed, the cracks in the pile body are closely distributed, the vertical development and bifurcation of cracks are more, and some cracks are interlaced with each other. The test values of ultimate flexural bearing capacity of composite reinforced concrete prefabricated square pile joints are much larger than the calculated values of the formula of ultimate flexural bearing capacity of pile body, and are more than 50%. There are two kinds of failure modes of square pile joint: bending failure of normal section of pile body and joint failure of end plate and pile body. Joint specimens with bending failure of normal section of pile body have better bearing capacity and deformation performance.
【作者单位】： 浙江大学建筑设计研究院有限公司;浙江大学结构工程研究所;
【基金】：国家自然科学基金资助项目(51479176,51009122)
【分类号】：TU473.13
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