预应力连接UHPC预制拼装管廊受力性能试验研究  

Experimental Study on Mechanical Performance of Prestressed UHPC Prefabricated Utility Tunnel

作　　者：朱三凡 胡超 夏樟华[3] 许有胜 姜绍飞[3] ZHU Sanfan;HU Chao;XIA Zhanghua;XU Yousheng;JIANG Shaofei(JianYan Testing Group Co.,LTD,Xiamen 361004,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Shenzhen Municipal Engineering Design Institute Lt.Co,Shenzhen 518035,China)

机构地区：[1]健研检测集团有限公司,福建厦门361004 [2]华侨大学土木工程学院,福建厦门361021 [3]福州大学土木工程学院,福建福州350108 [4]深圳市市政设计研究院有限公司,广东深圳518035

出　　处：《应用基础与工程科学学报》2025年第1期289-299,共11页Journal of Basic Science and Engineering

基　　金：国家“十三五”重点专项课题(2016YFC0700706);福建省科技计划项目引导性项目(2022Y0046);福建省建设科技项目(2022-k-175)。

摘　　要：相比于钢筋混凝土(RC)管廊,超高性能混凝土(UHPC)管廊可以减小结构板厚,获得更大使用空间,并可以提升耐久性和使用寿命.为比较两种管廊在受力情况下的损伤机理和破坏模式,以及开裂荷载、刚度、极限承载力和接缝张开量等指标,进行了预应力筋连接UHPC管廊和RC管廊的静力作用下的受力性能试验,并通过有限元模型分析了预应力度对UHPC管廊纵向刚度的影响规律,研究了纵向刚度的简化计算方法.研究结果表明:相较于RC管廊,UHPC管廊的开裂荷载、屈服荷载和极限荷载分别提高了84%、36%、45.5%;UHPC管廊抗弯刚度大于RC管廊;在达到极限荷载时,UHPC管廊接头竖向错位相较于RC管廊小38.0%,说明UHPC管廊接头性能优于RC管廊,根据有限元分析得到的刚度计算式可为UHPC管廊的设计计算提供依据.Compared to RC(Reinforced Concrete)utility tunnel,Ultra-High Performance Concrete(UHPC)utility tunnel can reduce structural slab thickness,allow for larger usable space,and improve the durability and service life.To compare the damage mechanisms and damage modes of two kindes of utility tunnels,as well as the cracking load,stiffness,ultimate bearing capacity and joint opening under,the mechanical performance test of the prestressing tendon connected UHPC utility tunnel and RC utility tunnel under the static force was carried out.The effect of prestressing degree on the longitudinal stiffness of the UHPC utility tunnel was analyzed by finite element model,and the stiffness calculation method was also to be explored.The results show that compared with RC utility tunnel,the cracking load,yield load and ultimate load of UHPC utility tunnel increase by 84%,36%and 45.5%respectively.And the bending stiffness of UHPC utility tunnel have is larger than that of RC utility tunnel.When reaching the ultimate load,the vertical misalignment of the UHPC utility tunnel joint is 38%smaller than that of the RC utility tunnel,indicating that the mechanical performance of UHPC utility tunnel joints is better than that of RC utility tunnel.The rigid calculation formal of the joints can provide a basis for the design calculation of UHPC utility tunnel.

关 键 词：UHPC 预应力 综合管廊 破坏模式 承载力 抗弯刚度 接头 

分 类 号：TU990.3[建筑科学—市政工程]