河南理工大学学报（自然科学版）2024，Vol.43Issue(1)：157-164,195,9.DOI:10.16186/j.cnki.1673-9787.2022090026
部分充填式窄幅钢箱-UHPC组合梁抗剪试验研究
Experimental study on shear strength of partially filled narrow steel box-UHPC composite beam
摘要
Abstract
Objective In order to study the shear performance of partially filled narrow steel box-UHPC com-posite beams,Methods static load tests were carried out on four inverted composite beam specimens by three-point loading,and the load-deflection curves,strain distributions,load-slip curves,and final damage patterns of the composite beams were obtained by investigating the damage patterns and deformation charac-teristics under the action of the negative bending moments.Results The results of the experimental study show that:the UHPC wings significantly improved the deformation capacity and ultimate load carrying ca-pacity of the combined beams;compared with specimen SUCB-3(NC wing),the load carrying capacity of specimens SUCB-1(1/2 UHPC wing)and SUCB-4(full UHPC wing)were increased by 18.2%and 27.3%,while the deformation capacity was increased by 38.02%and 41.2%,respectively;the addition of steel fibers can effectively improve the deformation and ultimate capacity of combined beams under negative bending moments.The addition of steel fibers can effectively inhibit the development of cracks in the wing plate,and the maximum crack width of the specimen was reduced from 1.06 mm to 0.92 mm by increasing the dosage of steel fibers from 0 to 2%,and the deformation capacity was enhanced by 23.61%,while the load-bearing capacity was increased by 4%.Conclusion The formula for calculating the shear capacity of the combined beam considering the contribution of steel box,UHPC flange and filled concrete is presented.关键词
窄幅钢箱-UHPC组合梁/静载试验/抗剪承载力/钢纤维掺量Key words
narrow steel box-UHPC composite beam/static load test/shear bearing capacity/steel fiber content分类
建筑与水利引用本文复制引用
莫时旭,熊豪,郑艳,柴龙杰..部分充填式窄幅钢箱-UHPC组合梁抗剪试验研究[J].河南理工大学学报（自然科学版）,2024,43(1):157-164,195,9.基金项目
国家自然科学基金资助项目(52068012) （52068012）
广西自然科学基金资助项目(2021GXNSFAA220101) （2021GXNSFAA220101）
