湖南大学学报（自然科学版）2025，Vol.52Issue(7)：50-60,11.DOI:10.16339/j.cnki.hdxbzkb.2025066
RBP-UHPC变截面悬挑梁足尺受弯试验研究
Research on Full-scale Bending Test of RBP-UHPC Variable Section Cantilever Beam
摘要
Abstract
In order to investigate the mechanical behavior of RBP-UHPC(retard-bonded prestressed ultra-high performance concrete)cantilever beam,two full-scale RBP-UHPC variable section cantilever beams were tested based on the background of the cantilever stairs in Shanghai Opera House.The test results show that during the loading process,the key variable sections cracked in turn,and the cracks were most dense near the key sections.The farther away from the key variable sections,the shorter and sparser the cracks were.The failure position of the cantilever beam was 2.6 m away from the root of the beam.The closer the section was to the failure section,the sooner the strain of UHPC and rebar reached the elastic compressive strain of UHPC and the yield strain of the rebar.The safety margin of the failure section of the two beams was 1.97 and 1.81 respectively,which had good structural performance and can meet the strength requirements of practical engineering.A calculation model for the ultimate bending moment of RBP-UHPC π-shaped variable section cantilever beam with structural plate was proposed.Compared with the existing codes,the calculated results of the model in this paper were in the best agreement with the experimental results and were safer.关键词
缓粘结预应力/超高性能混凝土/变截面/悬挑梁/受弯试验Key words
retard-bonded prestressed/ultra-high performance concrete(UHPC)/variable section/cantilever beam/bending test分类
建筑与水利引用本文复制引用
何林忆,熊学玉,包联进,陈建兴..RBP-UHPC变截面悬挑梁足尺受弯试验研究[J].湖南大学学报（自然科学版）,2025,52(7):50-60,11.基金项目
上海市社会发展科技攻关项目(20dz1202003),Science and Technology Commission of Shanhai Municipality(20dz1202003) （20dz1202003）
国家自然科学基金资助项目(52078364),National Natural Science Foundation of China(52078364) （52078364）
安徽省住房城乡建设科学技术计划资助项目(2020-YF21),Anhui Province of Housing and Urban-Rural Construction Science and Technology Plan Project(2020-YF21) （2020-YF21）
