PRC管桩接头抗弯性能试验研究  

Experimental study on flexural performance of PRC pipe piles joints

作　　者：徐妍 唐昌意 李松 崔凯[2] 梅晓 郭谷良 李军 王景梅[6] XU Yan;TANG Changyi;LI Song;CUI Kai;MEI Xiao;GUO Guliang;LI Jun;WANG Jingmei(Zhuhai Institute of Urban Planing&Design,Zhuhai 519000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 611752,China;Urban Planning and Construction Bureau Guangdong-Macao In-Depth Cooperation Zone in Hengqin,Zhuhai 519031,China;Jianhua Construction Materials(Hunan)Co.,Ltd.,Yueyang 410500,China;Wuhan Wuchuang Machinery Equipment Co.,Ltd.,Wuhan 430040,China;School of Civil Engineering,Guangdong Communication Polytechnic,Guangzhou 510650,China)

机构地区：[1]珠海市规划设计研究院,珠海519000 [2]西南交通大学土木工程学院,成都611752 [3]横琴粤澳深度合作区城市规划和建设局,珠海519031 [4]建华建材(湖南)有限公司,岳阳410500 [5]武汉五创机械设备有限公司,武汉430040 [6]广东交通职业技术学院土木工程学院,广州510650

出　　处：《建筑结构》2024年第22期139-144,151,共7页Building Structure

基　　金：国家自然科学基金项目(42177128);2022年度广州市基础研究计划基础与应用基础研究项目(202201011724)。

摘　　要：为探究影响混合配筋管桩(PRC管桩)接头性能的因素,开展了3组共8根PRC管桩接头抗弯性能试验,得到PRC管桩跨中弯矩与挠度的曲线关系及破坏形式。分析预应力钢筋的张拉比例、张拉方式以及接头形式对PRC管桩接头抗弯承载力的影响,并将试验所得极限弯矩值与规范理论计算值进行对比。结果表明,同等条件下PRC管桩的预应力筋在50%张拉应力时桩身极限抗弯承载力最强,最大挠跨比为1/129;预应力筋与非预应力筋同时张拉时,PRC管桩的延性及承载力均可获得一定提升,最大挠跨比为1/66;桩头外套钢管对接头强度的提高作用最明显,但更容易造成接头处的应力集中;接头处抗弯承载力约为桩身抗弯承载力的64%~82%。综合考虑,桩头加锚固筋时接头抗弯承载力较高且更为安全。In order to investigate the factors affecting the joint performance of hybrid reinforced concrete piles(PRC pipe piles),three groups of eight PRC pipe pile joints were tested for flexural performance,and the curvilinear relationship between bending moment and deflection in the span of PRC pipe piles as well as the damage form were obtained.The influence of the tension ratio,tensioning method and joint form of prestressed reinforcement on the bending capacity of PRC pipe pile joints was analyzed,and the ultimate bending moment value obtained from the tests was compared with the theoretical calculation value of the specification.The results show that under the same condition,the PRC pipe pile has the strongest ultimate bending capacity when tension stress of prestressed reinforcement is 50%,and the maximum deflection-span ratio is 1/129.When the prestressed reinforcement and non-prestressed reinforcement are tensioned at the same time,the ductility and load carrying capacity of the PRC pile pile can be improved to some extent,and the maximum deflection-span ratio is 1/66.The jacketed steel pipe at the head of the pile has the most obvious effect on the strength of the joints but is more likely to cause the stress concentration at the joints.The bending capacity of the joint is about 64%~82%of the bending capacity of the pile body.Considering all the factors,the bending capacity of the joint is higher and safer when anchoring bars are added to the pile head.

关 键 词：PRC管桩 桩间接头 抗弯性能 张拉比例 张拉方式 接头形式 

分 类 号：TU473.1[建筑科学—结构工程]