超高性能混凝土提升预制沟道管廊接头力学性能研究  

Enhancement of mechanical performance of precast utility tunnel manhole joints with UHPC ultra-high performance concrete

作　　者：付伟庆 黄鑫[1] 王鑫鹏 苗圃 侯东帅 王建 FU Weiqing;HUANG Xin;WANG Xinpeng;MIAO Pu;HOU Dongshuai;WANG Jian(College of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《铁道科学与工程学报》2025年第3期1215-1228,共14页Journal of Railway Science and Engineering

基　　金：国家重点研发计划(2018YFC0704804);国家自然科学基金资助项目(52178488);上海市工程技术研究中心建设专项(17DZ2251800)。

摘　　要：预制沟道管廊作为一种城市地下支线管廊,因埋深浅且上部竖向荷载较大,其接头连接部位易发生局部损坏及廊体竖向错动,过量变形可能危及廊内管线安全使用。基于此,采用试验和理论分析相结合的方法,研究超高性能混凝土(ultra-high performance concrete,UHPC)材料对管廊接头力学性能的提升效应并提出承载力计算方法。首先采用足尺试验研究管廊接头腋角局部采用UHPC材料加强后的力学性能;然后应用ABAQUS软件建立管廊有限元模型,基于经过验证的模型,开展UHPC腋角长度、UHPC腋角高度和UHPC强度等多参数对接头承载力的影响分析。试验结果表明:将占管廊10%的普通混凝土材料替换为超高性能混凝土材料后,接头抗弯承载力提高134%,接头抗弯刚度增加165%;抗剪承载力提高179%,接头抗剪刚度增加118%,证明这种局部加强方法是可行和有效的。分析结果表明:UHPC加强管廊腋角高度每增加20 mm,抗弯、抗剪承载力分别增加42 kN·m和38 kN;UHPC材料强度每增加20 MPa,接头抗弯和抗剪承载力分别增加68 kN·m和37 kN;UHPC加强管廊腋角长度每增加100 mm,接头抗弯承载力提高44 kN·m;钢棒预紧力每增大25 kN,接头抗剪承载力提高30 kN;钢棒数量由2根增加到4根,接头抗剪承载力提高196 kN。研究得到的接头抗弯、剪承载力公式,计算结果与试验结果较为吻合,可为新型管廊接头的设计和应用提供依据。Precast utility tunnels,as a type of urban underground branch utility corridor,are typically installed at shallow depths with significant vertical loads above them.This makes the joint connections susceptible to localized damage and misalignment of the tunnel sections,which can lead to significant deformations and result in the malfunction of the pipelines within the corridor.This study employed experimental and theoretical analysis methods to investigate the effectiveness of using Ultra-High Performance Concrete(UHPC)material to enhance the mechanical performance of tunnel manhole joints and to develop calculation methods for their load-bearing capacity.The artical began with full-scale experiments to examine the mechanical performance of tunnel joints after reinforcing the haunched area with UHPC material.Subsequently,the ABAQUS software was utilized to construct a finite element model of the utility tunnel.After validation,the model was used to analyze the impact of multiple parameters,such as the length and height of the haunched area and the strength of the UHPC,on the joint's load-bearing capacity.The experimental results indicate that by replacing 10%of the ordinary concrete material in the tunnel with UHPC material,the joint’s bending resistance increased by 134%,and the joint’s bending stiffness increased by 165%.The shear capacity is enhanced by 179%,and the joint’s shear stiffness increased by 118%,demonstrating that this localized reinforcement method is feasible and effective.The analysis shows that for every 20 mm increase in the height of the UHPC-strengthened haunched area of the tunnel,the bending and shear load-bearing capacities increase by 42 kN·m and 38 kN,respectively.For every 20 MPa increase in the strength of the UHPC material,the joint’s bending and shear load-bearing capacities increase by 68 kN‧m and 37 kN,respectively.When the length of the UHPC-strengthened haunched area of the tunnel is increased by 100 mm,the joint’s bending load-bearing capacity is raised by 44 kN·m.

关 键 词：沟道式管廊 超高性能混凝土 力学性能 ABAQUS 承载力计算方法 

分 类 号：TU375[建筑科学—结构工程]