异形钢筋混凝土梁桥剪力滞效应分析

Analysis of Shear Lag Effect in Irregular Girder Reinforced Concrete(RC) Bridge

利用有限单元法对异形钢筋混凝土梁桥的剪力滞效应进行分析,得到了关键截面的剪力滞系数和有效分布宽度,并与现行规范和文献[1]的有效宽度进行对比。结果表明:异形梁桥的剪力滞效应明显,部分梁段跨中截面出现负剪力滞效应;当T型截面梁宽跨比小于0.25时,现行规范、文献[1]和有限单元法计算的有效宽度相近,当宽跨比大于0.4时,规范有效宽度偏于保守,文献[1]和有限单元计算的有效宽度相近。

Finite element method is used to analyze the shear lag effect in irregular girder RC bridge. Shear lag coefficient and effective distribution width of the key sections are obtained, and compared with the effective widths in the current norms and documents. The results show that shear lag effect of irregular girder bridge is evident, and there is negative shear lag effect in midspan sections of some girders. When the width span ratio of T-type section beam is less than 0.25, the effective widths of the current norms and documents are close to the calculation of the finite element method. When the width span ratio is larger than 0.4, the effective width of the norms is conservative, and the effective width is close to the calculation of finite element.