预应力钢筒超高性能混凝土管套箍混凝土短柱的抗压性能研究  

Study on compressive behavior of pier concrete strengthened with prestressed ultra-high concrete cylinder pipe jacket

作　　者：陈岱杰 曹杰荣 黄维佳 渊喆 石兵 楼拓 丁庆军[2] 李进辉 侯东帅 CHEN Daijie;CAO Jierong;HUANG Weijia;YUAN Zhe;SHI Bing;LOU Tuo;DING Qingjun;LI Jinhui;HOU Dongshuai(Construction Headquarters of the Second Phase of Liuheng Bridge,Zhoushan 316000,China;State Key Laboratory of Silicate Material for Architecture,Wuhan University of Technology,Wuhan 430070,China;China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300000,China;China Railway Construction Port and Shipping Bureau Group Co.,Ltd.,Zhuhai 519000,China;School of Materials Science and Engineering,Wuhan Textile University,Wuhan 430070,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266000,China)

机构地区：[1]舟山市六横大桥二期工程建设指挥部,浙江舟山316000 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [3]中国铁建大桥工程局集团有限公司,天津300000 [4]中国铁建港航局集团有限公司,广东珠海519000 [5]武汉纺织大学材料科学与工程学院,湖北武汉430070 [6]青岛理工大学土木工程学院,山东青岛266000

出　　处：《混凝土》2024年第4期35-40,共6页Concrete

基　　金：国家自然科学基金(U2006224)。

摘　　要：跨海大桥面临着严峻的耐久性问题,尤其是混凝土桥墩。提出以围套的形式保护海洋工程桥墩混凝土柱防止海水侵蚀,在钢管外壁设置剪力钉,然后浇筑超高性能混凝土(UHPC),并缠绕预应力钢丝,最后浇筑UHPC,形成预应力钢筒超高性能混凝土管(PUCCP)。制备了PUCCP套箍混凝土柱,并对其进行了抗压试验,并与素混凝土柱和UHPC套箍混凝土柱进行对比。此外,分析了PUCCP中预应力大小对PUCCP套箍混凝土柱抗压性能的影响。试验结果表明:相比素混凝土柱和UHPC套箍混凝土柱,PUCCP套箍可显著提高混凝土柱的抗压强度,且随着预应力的增加,混凝土柱的抗压强度相应增加;PUCCP套箍能对混凝土柱提供比UHPC套箍更充分的侧向约束,以实现应变硬化行为,从而显著提高混凝土柱的初始刚度和延性。Cross-sea bridges face severe durability problems,especially concrete piers.It propose to protect the concrete columns of o-cean engineering piers from seawater erosion in the form ofa sleeve,which sets shear nails on the outer wall of the steel pipe,then pouring ultra-high performance concrete(UHPC)and winding prestressed steel wires,and finally pouring UHPC to form a prestressed ultra-high-performance concrete cylinder pipe(PUCCP).Concrete columns confined by PUCCP were prepared and its compressive tests were con-ducted and compared with plain concrete short columns and concrete columns confined by UHPC in this work.Moreover,the effect of the magnitude of prestress in the PUCCP on the compressive properties for concrete columns confined by PUCCP is analyzed.The experimen-tal results show that compared with the plain concrete columns and the concrete columns confined by UHPC,PUCCP hoops can signifi-cantly improve the compressive strength of the concrete columns,and it increase accordingly with the increase of prestress.The PUCCP hoops to concrete columns can provide a more adequate lateral constraint than that of UHPC hoops to achieve the strain-hardening behav-ior,which significantly improves the initial stiffness and ductility.

关 键 词：预应力钢筒超高性能混凝土管 混凝土 短柱 抗压性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]