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为了解宽翼缘(大挑臂)混凝土箱梁关键的受力特性,以沈阳四环路高坎浑河大桥引桥(主跨35m预应力混凝土连续箱梁桥,翼缘宽度达5.3m)为例进行分析研究。分析表明,与常规翼缘宽度箱梁相比,宽翼缘箱梁的剪力滞效应、顶板横向受力、上部结构抗倾覆稳定性等受力特点显著,是控制设计的关键因素,在设计过程中应予以充分重视,进行详细的分析验算,确保结构安全,针对以上关键受力点均进行了分析计算,分析方法和计算结果可供同类桥梁设计验算参考。
In order to understand the key stress characteristics of concrete box girder with wide flanges (large arm), taking the approach bridge (the span of 35m prestressed concrete continuous box girder bridge with main span of 5.3m) Example for analysis and research. The analysis shows that compared with the conventional box girders with wide flanges, the shear lag effect, the transverse force of roof and the anti-overturning stability of superstructure stress characteristics of the wide flange box girder are significant and are the key factors in the control design. In the design During the process, full attention should be paid to detailed analysis and checking to ensure structural safety. All the above key stress points have been analyzed and calculated. The analysis methods and calculation results can be used for reference of similar bridge designs.