钢-混凝土波形钢腹板组合梁弯扭性能研究  

Research on bending-torsional behaviors of steel-concrete composite beam with corrugated steel webs

作　　者：李运生 李孟彪[1,2] 王亚萍 张彦玲 LI Yunsheng;LI Mengbiao;WANG Yaping;ZHANG Yanling(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Key Lab of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《河北科技大学学报》2022年第1期99-109,共11页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(51778377);河北省自然科学基金(E2018210149);石家庄铁道大学研究生创新资助项目(YC2021084,YC2021017)。

摘　　要：为进一步揭示弯扭作用下钢-混凝土波形钢腹板组合梁的开裂机理和弯扭破坏模式,完成了5片试验梁在弯矩和扭矩联合作用下的弯扭性能模型试验,结合ANSYS有限元分析,给出弯扭作用下波形钢腹板组合梁开裂弯矩折减系数和开裂扭矩折减系数计算公式,以及极限弯矩和极限扭矩相关关系。结果表明:随着扭弯比增大,开裂弯矩减小,开裂扭矩增大,混凝土板斜裂缝与梁轴的夹角逐渐减小;破坏形式由正截面受弯破坏逐渐变化为以最大主拉斜裂缝开裂过大、裂缝间混凝土斜压短柱达到极限压应变为特征的受扭破坏。扭弯比k小于0.15时,极限弯矩基本不受扭矩影响;大于0.6时,极限扭矩基本不受弯矩影响;在0.15和0.6之间时,极限弯矩和极限扭矩均出现明显削弱,二者呈现单调下降的直线相关关系。针对一定扭弯比范围内的波形钢腹板组合梁,提出的开裂弯矩和开裂扭矩折减系数计算公式以及极限弯-扭关系方程,揭示了弯扭作用下混凝土板的开裂机理和弯扭破坏模式,可为研究其他扭弯比条件下的波形钢腹板组合梁弯扭性能提供参考。To further reveal the cracking mechanism and the bending-torsional failure mode caused by the bending-torsional behaviors of the steel-concrete composite beam with corrugated steel webs,model experiments were conducted on five test beams under the combined bending-torsional load.Combined with ANSYS finite element analysis,reduction factors for both the cracking bending moment and torsional moment were proposed,and the bending-torsional correlation formula between the ultimate bending moment and torsional moment was suggested.The results show that,with the increase of the ratio of bending moment,the cracking torsional moment increases,while the cracking bending moment and the angle between the inclined crack and the longitudinal axis decrease gradually;the failure mode is changed from bending failure of normal section to torsional failure which is characterized by a main inclined crack and the inclined compressed concrete column reaching to the ultimate strain.When the torsional bending ratio k≤0.15,the torsional moment has little influence on the ultimate bending moment;when k≥0.6,the bending moment has little influence on the ultimate torsional moment;when 0.15<k<0.6,both the ultimate bending moment and the torsional moment are reduced apparently by the combined bending-torsional effect with a monotone decreasing linear correlation.The experimental study can reveal the interaction between the bending and torsional properties of composite beams with corrugated steel webs in a certain range of k,which reveals the cracking mechanism and bending torsion failure mode of concrete slabs under bending and torsion,provides some reference for the study of the bending and torsional properties of composite beams with corrugated steel webs in other range of k.

关 键 词：复合结构 钢-混凝土波形钢腹板组合梁 弯扭性能 开裂荷载 极限荷载 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]