建筑结构学报2026，Vol.47Issue(8)：134-148,15.DOI:10.14006/j.jzjgxb.2025.0588
地聚物混凝土带翼缘箱梁受扭性能试验与承载力计算方法
Experimental investigation on torsional capacity calculation methods for geopolymer concrete box girders with flanges
摘要
Abstract
To investigate the torsional behavior of geopolymer concrete(GPC)box girders with flanges,pure torsion tests were conducted on one conventional concrete(OPC)girder and seven GPC girders.The investigated parameters included concrete type(conventional concrete and GPC),GPC strength grade(C50 and C70),reinforcement arrangement(under-reinforced,properly-reinforced,partially over-reinforced in longitudinal reinforcement,and partially over-reinforced in stirrups),and web thickness(50,70,and 90 mm).Based on the experimental results,the effects of these parameters on the torsional performance were systematically analyzed.The results indicate that GPC box girders exhibit similar failure modes and cracking patterns as OPC girders under pure torsion.The cracking torque of GPC girders is approximately 55.6％-78.5％of that of conventional concrete girders with the same strength grade,whereas the concrete type has little influence on the torsional capacity.For properly reinforced girders with strength ratio of 1.28,GPC strength has a limited effect on torsional capacity when the reinforcement ratio is the same.The shape of the torque-reinforcement strain curve is closely related to the failure mode of the specimens.Under the same external torque,the concrete strain in the flanges is generally smaller than that in the webs and bottom concrete plates,being approximately 55％of the latter.Compared with OPC beams,GPC beams develop a larger number of cracks with smaller average crack spacing and overall greater crack widths.A modified softened membrane model and simplified design equations based on the current Chinese code(GB/T 50010-2010)and the American code(ACI 318-19)were proposed to predict the cracking torque and torsional capacity of GPC box girders with flanges.Comparison with the experimental results of the seven tested girders demonstrates that both the modified model and the simplified equations provide good applicability and high prediction accuracy.关键词
地聚物混凝土/带翼缘箱梁/纯扭试验/开裂扭矩/受扭承载力/简化计算公式Key words
geopolymer concrete/box girder with flanges/pure torsion test/cracking torque/torsional capacity/simplified calculation formula分类
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周聪,汪建群,黄博,史才军,周之栋..地聚物混凝土带翼缘箱梁受扭性能试验与承载力计算方法[J].建筑结构学报,2026,47(8):134-148,15.基金项目
国家自然科学基金项目(52578202,52478173,51638008),湖南省自然科学基金项目(2025JJ50236). （52578202,52478173,51638008）
