预制主梁UHPC湿接缝受弯性能试验研究  

Experimental study on flexural behaviour of wet joint of UHPC prefabricated main girder

作　　者：张哲[1] 靳文豪 张晨曦 汤意 王伟 杜战军 高继平 邓恩峰 ZHANG Zhe;JIN Wenhao;ZHANG Chenxi;TANG Yi;WANG Wei;DU Zhanjun;GAO Jiping;DENG Enfeng(School of Civil Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China;China Construction Eighth Bureau(Xiamen)Construction Co.,Ltd.,Xiamen,Fujian 361000,China;Henan Provincial Communications Planning&Design Institute Co.,Ltd.,Zhengzhou,Henan 450000,China;Henan YaoLuanXi Expressway Construction Co.,Ltd.,Luoyang,Henan 471000,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]中建八局(厦门)建设有限公司,福建厦门361000 [3]河南省交通规划设计研究院股份有限公司,河南郑州450000 [4]河南省尧栾西高速公路建设有限公司,河南洛阳471000

出　　处：《公路交通科技》2025年第4期105-111,共7页Journal of Highway and Transportation Research and Development

基　　金：河南省交通运输科技计划项目(2020J-2-7,2021J3);河南省自然科学基金项目(242300421177);河南省科技研发计划联合基金项目(235200810013)。

摘　　要：【目标】湿接缝是影响横向多梁体系桥梁受力性能与耐久性的关键,本研究依托郑栾高速某横向多梁体系桥梁,将超高性能混凝土(UHPC)用于湿接缝。【方法】开展12个足尺试件抗弯性能试验,探究钢筋搭接形式、钢筋搭接长度、湿接缝界面形状以及配筋率对UHPC湿接缝开裂荷载与极限承载力的影响。【结果】UHPC湿接缝试件的薄弱部位是湿接缝与预制板的接缝,但在试件破坏时预制板受压区混凝土压碎,湿接缝未出现裂缝;横向UHPC湿接缝强度可以达到或超过现浇混凝土桥面板;当钢筋搭接长度超过10倍钢筋直径之后,继续提高搭接长度对湿接缝的承载力无显著影响,采用UHPC可简化湿接缝内钢筋搭接形式;湿接缝采用菱形界面和提高配筋率均可显著提高试件的开裂荷载及极限荷载;相比于直线形钢筋搭筋,U形钢筋搭接在弹性阶段有较高的抗弯刚度,但二者极限承载力比较接近。【结论】试验结果表明,综合考虑现场施工工艺等因素,对于横向多梁体系湿接缝的施工,采用UHPC湿接缝、钢筋直线搭接(搭接长度≥10 d)的施工效果较为理想,可减少搭接钢筋焊接量且免去振捣环节。现行《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362—2018)可用于计算含UHPC湿接缝试件抗弯承载力,理论值与试验值平均比值为0.90。[Objective]The wet joint is the key factor that influencing the mechanical property and durability of bridges with transverse multi-girder system.The study based on a bridge with transverse multi-girder system on Zhengzhou-Luanchuan expressway.The ultra-high performance concrete(UHPC)was used for the bridge wet joint.[Method]12 full-scale specimens were design and tested for flexural behaviour.The influences of reinforcement configuration,reinforcement length,wet joint interface shape and reinforcement ratio on crake load and ultimate bearing capacity of UHPC wet joint were investigated.[Result]The weak point of specimen with UHPC wet joint is the joint between wet joint and precast slab.However,when specimen failure,the concrete at precast slab compression zone crushes,and no cracks appear on wet joint.The capacity of transverse UHPC wet joint can be equal to or exceed the cast-in-place bridge deck.When the reinforcement lap length exceeds 10 times the reinforcement diameter,further increasing the lap length has no significant effect on the joint bearing capacity.The use of UHPC can simplify the form of reinforcement lap in wet joints.It is helpful to improve the crake load and ultimate bearing capacity of wet joint by using the U-shape reinforcement,rhombus-shape wet joint,and increasing reinforcement ratio.Compared with linear reinforcement,the U-shape reinforcement has higher bending stiffness in elastic stage,but their ultimate bearing capacities are quite close.[Conclusion]Considering in-situ construction techniques and other influencing factors,it is a relatively ideal construction method that employing UHPC wet joints and straight lap joints for reinforcement with a lap length no less than 10 times of reinforcement diameter.It is beneficial to reducing lap joints welding and omitting vibration.The current‘Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts’(JTG 3362—2018)can be used to calculate the flexural behaviour of UHPC wet joint specimen.The

关 键 词：桥梁工程 受弯性能 试验研究 湿接缝 超高性能混凝土 开裂荷载 极限承载力 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU398[交通运输工程—道路与铁道工程]