不同箍筋形式UHPC梁受扭性能试验  

Experimental study on torsional behavior of UHPC beams with different stirrup configurations

作　　者：李丽[1,2,3] 熊云峰 全勇鹏 张维佳 王延伟 LI Li;XIONG Yunfeng;QUAN Yongpeng;ZHANG Weijia;WANG Yanwei(Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;School of Civil Engineering,Guilin University of Technology,Guilin 541004,China;China Railway Tunnel Group Municipal Engineering Company,Hangzhou 310012,China;The 2nd Engineering Co.,Ltd.,of China Railway Tunnel Group,Langfang 065201,China)

机构地区：[1]桂林理工大学广西绿色建材与建筑工业化重点实验室,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [3]桂林理工大学土木工程学院,广西桂林541004 [4]中铁隧道局集团市政工程公司,浙江杭州310012 [5]中铁隧道集团二处有限公司,河北廊坊065201

出　　处：《广西大学学报（自然科学版）》2024年第5期917-929,共13页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(51968016)

摘　　要：为了揭示箍筋形式对超高性能混凝土(UHPC)矩形梁受扭性能影响,以箍筋形式、间距为变量,开展UHPC梁纯扭试验和计算方法研究。对6根UHPC矩形梁进行纯扭试验。分析受扭梁的失效模式和受扭性能,最后基于螺旋箍筋UHPC梁受力机制,推导极限扭矩计算公式,并与现行规范进行比较。结果表明:不同箍筋形式UHPC矩形梁的失效模式均为延性破坏;箍筋间距相同时,螺旋箍筋梁的裂缝分布更密集;极限扭矩、扭转延性及屈服刚度与箍筋间距呈负相关,螺旋箍筋屈服刚度提升更为显著;本文提出的螺旋箍筋UHPC梁极限扭矩公式计算值与试验值结果吻合良好,表明螺旋箍筋UHPC梁具有较好的抗扭性能,提出的计算公式可较好地预测极限扭矩。To investigate the influence of stirrup configurations on the torsional behavior of ultra-high performance concrete(UHPC)rectangular beams,an experimental and analytical study was undertaken with stirrup form and spacing as variables.Pure torsion tests were conducted on six UHPC rectangular beams,then the failure modes and torsional behavior of the beams were analyzed.Based on the stress mechanism of spiral stirrup UHPC beams,the formula for calculating the ultimate torsional capacity was derived and compared with current regulations.The results show that the failure mode of UHPC rectangular beams with different stirrup configurations is ductile failure.It is observed that when stirrup spacing is consistent,beams with spiral stirrups exhibit a denser crack distribution.Furthermore,there is a negative correlation between ultimate torsional capacity,torsional ductility,and yield stiffness with stirrup spacing,with spiral stirrups showing a more significant improvement.The calculated ultimate torsional capacities for spiral stirrup UHPC beams,as presented in this study,aligned well with the experimental findings.All these findings suggest that spiral stirrup UHPC beams offer robust torsional performance,and the proposed formula can effectively predict their ultimate torsional capacity.

关 键 词：箍筋形式 超高性能混凝土 纯扭试验 受扭性能 

分 类 号：TU375.1[建筑科学—结构工程]