UHPC-窄幅钢箱组合梁裂缝宽度计算方法  

UHPC-narrow steel box composite beam crack width calculation method

作　　者：黄荆 莫时旭[1,2] 刘晓贝 郑艳 HUANG Jing;MO Shixu;LIU Xiaobei;ZHENG Yan(College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西建筑新能源与节能重点实验室,广西桂林541004

出　　处：《混凝土》2024年第8期63-66,89,共5页Concrete

基　　金：国家自然科学基金(52068012);广西自然科学基金(2021GXNSFAA220101)。

摘　　要：针对钢-混凝土组合梁负弯矩区易开裂的情况,提出了UHPC-窄幅钢箱组合梁结构,通过UHPC抵抗组合梁负弯矩区的拉力。通过对5根试验梁进行负弯矩下的静力加载试验,得到不同钢纤维掺量对翼板中裂缝分布的影响,分析了各试验梁的裂缝分布特点,并推导了裂缝宽度的计算方法,得到理论值与试验值吻合良好。Aiming at the situation that the negative bending moment area of the steel-concrete composite beam is easy to crack,the UHPC-narrow steel box composite beam structure is proposed,and the tension of the negative bending moment area of the combined beam is resisted by UHPC.Through the static loading test under negative bending moment of the five test beams,the influence of different steel fiber dosage on the crack distribution in the wing plate is obtained,the crack distribution characteristics of each test beam are analyzed,and the calculation method of the crack width is derived,and the theoretical value and the test value are well consistent.

关 键 词：组合梁 负弯矩 超高性能混凝土 裂纹扩展 

分 类 号：TU528.31[建筑科学—建筑技术科学]