摘要
为了研究考虑剪力滞效应后的箱梁弯曲变形计算问题,由箱梁弯曲的曲率方程出发,探讨了剪力滞效应对箱梁挠曲变形的影响机理。结合设计规范,提出了箱梁弯曲变形计算的剪力滞系数和有效翼缘分布宽度2种修正方法,利用提出的2种修正方法对简支梁和连续梁在集中和均布荷载下的挠度进行了计算。结果表明:剪力滞系数的修正方法精度较高;考虑到设计的方便性,建议在剪力滞系数未知的情况下采用有效翼缘分布宽度修正方法来考虑剪力滞效应对刚度的影响。
In order to study bending deformation and its calculation for box girders considering shear lag effect, mechanism of shear lag effect on bending deformation was investigated based oncurvature equation. Based on the design specification, shear lag coefficient (SLC) and effective flange width (EFW) were presented to modify the bending deflection of box girders. Using SLCand EFW methods, effect of shear lag on deflection of example box girders of simply supported beam and continuous beam under concentrated force and uniform load was analyzed. The resultsshow although SLC has more accuracy than EFW, EFW can be used to calculate box girders deflection when SLC is unknown.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第1期93-97,共5页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51168030
51208242)
教育部长江学者和创新团队发展计划项目(IRT1139)
中国博士后科学基金项目(2012M521815)
甘肃省杰出青年基金项目(1210RJDA009)
关键词
桥梁工程
箱梁
理论分析
剪力滞
变形
修正系数
bridge engineering
box girder
theoretical analysis
shear lag
deflection
modified coefficient