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销钉式抗拔管桩接头抗弯性能试验研究
Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint
2024年第9期
抗拔管桩;机械接头;抗弯性能;开裂弯矩;极限弯矩;裂缝分布
Resistant extraction pile; Pin of mechanical joint; Flexural behavior; Cracking moment; Ultimate bending moment; Crack distribution
2024年第9期
10.19761/j.1000-4637.2024.09.052.06
宁波市重大科技任务攻关项目(2022Z030);宁波市交通运输科技项目(202217)。
曹伟伟,严天龙,张芳芳
宁波中淳高科股份有限公司,浙江 宁波 315000

曹伟伟,严天龙,张芳芳

曹伟伟,严天龙,张芳芳.销钉式抗拔管桩接头抗弯性能试验研究[J].混凝土与水泥制品,2024(9):52-57.

CAO W W,YAN T L,ZHANG F F.Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint[J].China Concrete and Cement Products,2024(9):52-57.

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摘  要:为提高预制混凝土桩的桩间连接质量,研发了一种销钉式机械连接接头。通过销钉式机械连接、销钉式机械连接与焊接连接组合的预制桩桩间接头的抗弯性能试验,对比分析了两种连接方式的受弯承载力、破坏特性与裂缝分布情况。结果表明:两种连接方式的管桩接头试件的开裂弯矩与极限弯矩试验值均大于理论值,满足设计要求;销钉式连接的管桩接头试件破坏形式为销钉受拉脱落,销钉式连接和焊接组合的管桩接头试件破坏形式为接头受压面混凝土破坏;两种连接方式的管桩接头试件在桩身裂缝出现前,各混凝土测点应变呈线性增长,试件跨中截面应变分布基本满足平截面假定。 Abstract: In order to improve the connection performance between prefabricated concrete piles, pin mechanical joints are used. Flexural performance tests were conducted on piles connected with pin mechanical joints, pin mechanical joints and hand welded combination respectively. The flexural capacity, failure characteristics and crack distribution were compared and analyzed. The results show that the measured values of cracking moment and ultimate bending moment are higher than the theoretical values, meeting the joints design requirements. The failure of the specimen with pin mechanical joints is that part of the joints are pulled out, while the failure of the specimen with pin mechanical connection and welding combination is the concrete failure of the joint compression surface. Before the cracks appear, the strain at the concrete measuring points of the specimens increases linearly, and the plane-section assumption agrees well with the results of strain distribution in the mid-span section of the specimens.
英文名 : Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint
刊期 : 2024年第9期
关键词 : 抗拔管桩;机械接头;抗弯性能;开裂弯矩;极限弯矩;裂缝分布
Key words : Resistant extraction pile; Pin of mechanical joint; Flexural behavior; Cracking moment; Ultimate bending moment; Crack distribution
刊期 : 2024年第9期
DOI : 10.19761/j.1000-4637.2024.09.052.06
文章编号 :
基金项目 : 宁波市重大科技任务攻关项目(2022Z030);宁波市交通运输科技项目(202217)。
作者 : 曹伟伟,严天龙,张芳芳
单位 : 宁波中淳高科股份有限公司,浙江 宁波 315000

曹伟伟,严天龙,张芳芳

曹伟伟,严天龙,张芳芳.销钉式抗拔管桩接头抗弯性能试验研究[J].混凝土与水泥制品,2024(9):52-57.

CAO W W,YAN T L,ZHANG F F.Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint[J].China Concrete and Cement Products,2024(9):52-57.

摘要
参数
结论
参考文献
引用本文

摘  要:为提高预制混凝土桩的桩间连接质量,研发了一种销钉式机械连接接头。通过销钉式机械连接、销钉式机械连接与焊接连接组合的预制桩桩间接头的抗弯性能试验,对比分析了两种连接方式的受弯承载力、破坏特性与裂缝分布情况。结果表明:两种连接方式的管桩接头试件的开裂弯矩与极限弯矩试验值均大于理论值,满足设计要求;销钉式连接的管桩接头试件破坏形式为销钉受拉脱落,销钉式连接和焊接组合的管桩接头试件破坏形式为接头受压面混凝土破坏;两种连接方式的管桩接头试件在桩身裂缝出现前,各混凝土测点应变呈线性增长,试件跨中截面应变分布基本满足平截面假定。

Abstract: In order to improve the connection performance between prefabricated concrete piles, pin mechanical joints are used. Flexural performance tests were conducted on piles connected with pin mechanical joints, pin mechanical joints and hand welded combination respectively. The flexural capacity, failure characteristics and crack distribution were compared and analyzed. The results show that the measured values of cracking moment and ultimate bending moment are higher than the theoretical values, meeting the joints design requirements. The failure of the specimen with pin mechanical joints is that part of the joints are pulled out, while the failure of the specimen with pin mechanical connection and welding combination is the concrete failure of the joint compression surface. Before the cracks appear, the strain at the concrete measuring points of the specimens increases linearly, and the plane-section assumption agrees well with the results of strain distribution in the mid-span section of the specimens.

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(1)销钉式抗拔管桩连接接头试件抗弯试验测得的开裂弯矩、极限弯矩试验值均大于理论计算得到的桩身开裂弯矩、极限弯矩,销钉式机械连接接头的质量可靠。
(2)两种连接方式的销钉式抗拔管桩连接接头试件的受弯破坏形式有所不同,销钉式机械连接试件的受弯破坏形式为桩底接头处销钉连接槽与销钉受拉变形脱落;而销钉式机械连接与焊接连接组合的试件接头处没有出现裂缝,试件的受弯破坏形式为受压区混凝土破坏。
(3)两种连接方式的销钉式抗拔管桩连接接头试件在桩身裂缝出现前,各混凝土测点应变呈线性增长,试件跨中截面应变分布基本满足平截面假定;竖向裂缝出现后截面中性轴上移,受压区混凝土应变稳定增长。

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[5] 周家伟,王云飞,龚顺风,等.弹卡式连接预应力混凝土方桩接头受弯性能研究[J].建筑结构,2020,50(13):121-133.
[6] 邓剑涛,袁涛,邓成河.预制桩用套珠式连接器的研究与应用[J].混凝土与水泥制品,2021(3):40-42.
[7] 齐金良.螺锁式预应力混凝土异型方桩连接接头受弯性能研究[J].建筑结构,2021,51(8):105-109.
[8] 中华人民共和国国家市场质量监督管理总局,中国国家标准化管理委员会.先张法预应力混凝土管桩:GB/T 13476—2023[S].北京:中国标准出版社,2023.

曹伟伟,严天龙,张芳芳.销钉式抗拔管桩接头抗弯性能试验研究[J].混凝土与水泥制品,2024(9):52-57.

CAO W W,YAN T L,ZHANG F F.Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint[J].China Concrete and Cement Products,2024(9):52-57.

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