UHPC加固钢筋混凝土T梁的抗弯承载力计算  

Calculation of flexural capacity of UHPC-reinforced concrete T-beams

作　　者：靳玉栋 陈聪 刘鹤 郭玉鹏 亓兴军 JIN Yudong;CHEN Cong;LIU He;GUO Yupeng;QI Xingjun(Jiqing High Speed Railway Co.,Ltd.,Jinan 250102,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]济青高速铁路有限公司,山东济南250102 [2]山东建筑大学交通工程学院,山东济南205101

出　　处：《混凝土与水泥制品》2024年第5期46-50,共5页China Concrete and Cement Products

基　　金：山东省交通运输厅科技计划项目(2022B06);济青高速铁路有限公司科技计划项目(JQKJ2024-10)。

摘　　要：综合考虑结构设计原理与现行桥梁加固规范,推导了UHPC加固钢筋混凝土T梁的抗弯承载力基本假定及计算公式,采用非线性有限元软件建立了试件的三维实体模型,进行了四点弯曲模拟试验,并对比分析了理论公式计算值与数值模拟试验值。结果表明:在截面高度增加10~20 cm的情况下,UHPC加固试件的抗弯承载力有显著提升;加固试件的抗弯承载力数值模拟试验值均大于理论计算值,平均相对误差为14.4%,理论公式具有一定的安全储备;推导的理论计算公式能简单、快速地预测试件的抗弯承载力,可为UHPC加固钢筋混凝土T梁的理论计算与工程应用提供参考。The basic assumptions and formula for the flexural capacity of UHPC-reinforced concrete T-beam were deduced by combining the structural design principle with the current bridge reinforcement code.The nonlinear finite element software was used to establish a three-dimensional solid model of a simply supported T-beam,carry out four-point bending simulation tests,and compare the calculated values of the theoretical formulas with the numerical simulation test values.The results show that the flexural load capacity of T-beam is significantly increased with a small increase of 10~20 cm in section height,which proves that ultra-high performance concrete is an excellent bridge reinforcement material with high reinforcement efficiency;the numerical simulation test values of flexural load capacity of T-beam are larger than the theoretical calculation values after reinforcement,with an average relative error of 14.4%,and the theoretical formulas have a certain amount of safety reserves.The formula derived from the research results can predict the flexural load capacity of T-beam combined section beams in a simple,safe and fast way,and provide a reference for the theoretical calculation and engineering application of ultra-high-performance concrete reinforced reinforced concrete T-beam.

关 键 词：加固 超高性能混凝土(UHPC) T梁 抗弯承载力 理论计算 

分 类 号：TU528.7[建筑科学—建筑技术科学]