UHPC加固钢筋混凝土梁抗弯承载力试验研究  

Experimental Study on Flexural Capacity of Reinforced Concrete Beams Reinforced with UHPC

作　　者：郑纲 李迎昊 王康宁 ZHENG Gang;LI Yinghao;WANG Kangning

机构地区：[1]桥梁智能与绿色建造全国重点实验室,湖北武汉430034 [2]中铁大桥科学研究院有限公司,湖北武汉430034

出　　处：《城市道桥与防洪》2024年第6期259-262,共4页Urban Roads Bridges & Flood Control

基　　金：湖北省交通运输厅科技项目(2020-186-2-8);中国中铁股份有限公司科技研究开发计划项目(2022-专项-02)。

摘　　要：为研究普通钢筋混凝土梁不同受力区域加固超高性能混凝土(UHPC)后抗弯承载力的变化情况,设计、制作了3根试验梁[未加固钢筋混凝土梁(RC)、受压区UHPC加固梁(UC)和受拉区UHPC加固梁(UT)],采用四点加载法进行抗弯试验,分析加固前后试验梁的破坏模式、荷载-挠度曲线及承载力变化规律。结果表明:试验梁UC和UT相较于RC,刚度和承载力大幅提高,其中承载力分别提高61.2%和96.9%;提出了钢筋混凝土梁受压区、受拉区(考虑纤维贡献)加固UHPC后的抗弯承载力简化计算公式,计算值和试验值误差小于5%,具有较高的计算精度和适用性。To study the change of flexural capacity of ordinary reinforced concrete beams reinforced with ultra-high performance concrete(UHPC)in different compressive zones,three test beams(reinforced concrete beam RC without reinforced,UHPC reinforced beam UC in compressive zone and UHPC reinforced beam UT in tensile zone)are designed and fabricated,and four-point loading method is used for flexural tests to analyze the failure mode,load-deflection curve and bearing capacity change of the test beam before and after reinforcement.The result shows that compared with the unreinforced RC beams,the stiffness and bearing capacity of test beams UC and UT are greatly improved,in which the bearing capacities increase by 61.2%and 96.9%respectively.A simplified formula for calculating the flexural capacity of concrete beams reinforced with UHPC in compressive zone and tensile zone(considering fiber contribution)is proposed.The error between the calculated value and the test value is less than 5%,which has the high calculation accuracy and applicability.

关 键 词：桥梁加固 超高性能混凝土 抗弯承载力 试验研究 理论分析 

分 类 号：U444[建筑科学—桥梁与隧道工程]