华中科技大学学报（自然科学版）2025，Vol.53Issue(8)：75-81,7.DOI:10.13245/j.hust.250335
钢箱-LUHPC组合梁抗弯试验及受弯承载力计算
Bending test and bending capacity calculation of steel-LUHPC composite box beams
摘要
Abstract
A lightweight ultra-high performance concrete(LUHPC)material,which has the advantages of light deadweight,high strength,and good cracking resistance,etc was developed.The steel-LUHPC composite box beam bridge was formed by stacking prefabricated LUHPC bridge deck panels and steel box girders,which can further reduce the deadweight of the bridge and improve the bridge spanning capacity.In order to clarify the bending capacity of the steel-LUHPC composite box beam bridge,two steel-LUHPC composite box beams were designed and fabricated,in which the and axle were located in the LUHPC deck plate and steel box girder,respectively,and the bending performance and damage mode of the steel-LUHPC composite box beams were obtained through the four-point bending and loading test,and the graphical diagrams of the combined girder cross-section stress were proposed and the formula for calculating bending ultimate bearing capacity of the steel-LUHPC composite box beams were deduced.The calculation formula of flexural ultimate load capacity of steel-LUHPC composite box beam was derived.The results show that the cross-section strain of the steel-LUHPC composite box beam conforms to the assumption of flat cross-section,and the loading process is divided into three stages:elastic stage,yielding stage and damage stage,and the damage mode is the tensile yielding of the steel box and the compression collapse of the upper surface of the LUHPC plate.The formula for calculating the flexural ultimate load capacity of the steel-LUHPC composite box beam is proposed,and its calculation results match the test results with the errors of 0.2%and 1.7%,respectively,which verifies the correctness of the formula.The research work provides theoretical and experimental basis for promoting the application of LUHPC materials in bridge engineering.关键词
轻质超高性能混凝土/钢箱-LUHPC组合梁/抗弯性能试验/破坏模式/承载力计算公式Key words
lightweight ultra-high performance concrete/steel-LUHPC composite box beam/flexural performance test/damage mode/bearing capacity calculation formula分类
交通工程引用本文复制引用
曹玉贵,罗云枫,刘沐宇,詹建辉..钢箱-LUHPC组合梁抗弯试验及受弯承载力计算[J].华中科技大学学报（自然科学版）,2025,53(8):75-81,7.基金项目
湖北省重点研发计划资助项目(2020BCB065,2020BCB081). （2020BCB065,2020BCB081）
