加速锈蚀后预应力混凝土方桩连接接头抗拉性能研究  

Study on Tensile Performance of Connection Joints of Prestressed Concrete Square Pile After Accelerated Corrosion

作　　者：樊华 徐铨彪[2,3] 陈刚 陈虹霖[4] 龚顺风 FAN Hua;XU Quan-biao;CHEN Gang;CHEN Hong-lin;GONG Shun-feng(Jiaxing Xinchuang Concrete Products Co.,Ltd.,Jiaxing 314109,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310028,China;Architectural Design&Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310028,China;Department of Civil Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]嘉兴欣创混凝土制品有限公司,浙江嘉兴314109 [2]浙江大学平衡建筑研究中心,浙江杭州310028 [3]浙江大学建筑设计研究院有限公司,浙江杭州310028 [4]浙江大学土木工程学系,浙江杭州310058

出　　处：《混凝土与水泥制品》2022年第4期36-41,共6页China Concrete and Cement Products

基　　金：浙江省重点研发计划项目(2018C03033-1);住房和城乡建设部科技项目(2019-K-046)。

摘　　要：为研究氯盐环境下预应力混凝土方桩连接接头的耐久性能,对弹卡式与焊接式连接方桩接头试件进行了通电加速锈蚀试验,并对劣化后两种接头试件和预应力钢棒分别进行了抗拉性能试验。结果表明:劣化后弹卡式连接接头试件整体连接性能较好,破坏形式为桩身裂缝开展充分,接头连接完好,下节桩预应力钢棒被拉断;焊接式连接接头试件在焊缝处锈蚀相对严重,轴向开裂拉力下降幅度较大,破坏形式为接头焊缝处被拉开,两侧端板完全脱离,桩身未出现裂缝;两种接头形式劣化后预应力钢棒材料力学性能下降均在10%以内。To study the durability of connection joints of prestressed concrete square pile in chlorine salt environments,the electrical accelerated corrosion tests were conducted on the connection joint specimens of prestressed concrete square piles using elastic clip connection and welded connection,and then the tensile behavior tests of two types of square pile connection joint specimens and the prestressing steel rods were also conducted,respectively.The results show that the deteriorated square pile joint specimens with elastic clip connection have good overall connection performance and more durability.The failure mode is that the cracks in the pile body are fully developed,the joint connection is intact,and the prestressed steel rods of the lower pile are pulled off.However,the weld seam at the connection joints for the welded connection square pile specimens are corroded seriously,and the axial cracking tensile force declines greatly.The failure mode is that there is no crack in the pile body,the weld seam at the joint connection is pulled apart and the end plates on both sides are completely detached.The mechanical properties of the prestressed steel rods decreases within 10%.

关 键 词：预应力混凝土方桩 连接接头 弹卡式连接 加速锈蚀 耐久性 抗拉性能 

分 类 号：TU528[建筑科学—建筑技术科学]