河南理工大学学报（自然科学版）2025，Vol.44Issue(2)：164-175,12.DOI:10.16186/j.cnki.1673-9787.2023100025
负弯矩作用下部分充填式窄幅钢箱-UHPC组合梁刚度分析
Stiffness analysis of partially-filled narrow steel box-UHPC composite beams under negative bending moment
摘要
Abstract
Objectives This study investigates the flexural performance of partially-filled narrow steel box-UHPC(ultra-high performance concrete)composite beams under negative bending moment,static load tests were conducted on nine composite beams with varying steel fiber contents,reinforcement ratios,and relative filling heights under reverse concentrated force.Methods The contributions of different parameters to the enhancement of the beams'mechanical properties were quantitatively assessed.Additionally,theo-retical deflection calculations,which take into account interface slip and flange cracking,were compared and validated against experimental results.Results The stiffness of the partially-filled narrow steel box-UHPC composite beams reached its peak in the overall elastic stage.After flange cracking,the stiffness slightly decreased.When the lower flange of the steel box locally yielded under compression,multiple through-cracks formed at mid-span.At the ultimate load stage,there was no significant reduction in bearing capacity.Compared with partially-filled narrow steel box-Normal Concrete(NC)composite beams and nar-row steel box-UHPC composite beams,as the parameters increased,the ultimate bearing capacity,stiff-ness at the serviceability limit state,and stiffness at the ultimate limit state of the partially-filled narrow steel box-UHPC composite beam increased by up to 57%,25%,and 21%,respectively.The loads corre-sponding to crack widths of 0.05 mm,0.1 mm,and 0.2 mm increased by up to 155%,266%,and 100%,respectively.Conclusions The partially-filled narrow steel box-UHPC composite beam exhibits high stiff-ness,excellent crack resistance,and superior bearing capacity.The current codes for calculating the de-flection of composite beams under negative moments are overly conservative.In contrast,the effective mo-ment of inertia method,which considers the influence of interface slip in composite beams under negative moments,provides more accurate calculations of the deflection of the test beams.关键词
部分充填式窄幅钢箱-UHPC组合梁/超高性能混凝土/负弯矩/极限承载力/裂缝宽度Key words
partially filled narrow steel box-UHPC composite beams/ultra-high performance concrete/ulti-mate bearing capacity/crack width分类
建筑与水利引用本文复制引用
莫时旭,柴龙杰,郑艳,黄意均,檀新宁..负弯矩作用下部分充填式窄幅钢箱-UHPC组合梁刚度分析[J].河南理工大学学报（自然科学版）,2025,44(2):164-175,12.基金项目
国家自然科学基金资助项目(52068012) （52068012）
广西自然科学基金项目(2021GXNSFAA220101) （2021GXNSFAA220101）
广西绿色建材与建筑工业化重点实验室项目(桂科能22-J-21-1) （桂科能22-J-21-1）
