【摘要】 针对波形钢腹板PC组合梁桥钢腹板与内衬混凝土在施工阶段剪力分配关系尚不明确、腹板屈曲稳定等问题,以萧曹运河桥为工程背景,通过理论计算和有限元分析,研究了最大悬臂施工阶段桥梁墩处腹板结合段波形钢腹板厚度尺寸对结构抗剪性能的影响,并进行结构屈曲分析。结果表明:添加内衬混凝土可以有效降低钢腹板剪应力水平;当内衬混泥土厚度超过20cm时,其承担剪力超过60%;1、2号块钢腹板厚度(16mm、20mm、25mm、30mm和35mm)变化对整个最大悬臂段钢腹板剪应力影响较小;钢腹板剪应力最大为119.907MPa,未发生屈曲,结构安全储备充足,抗剪性能优良。更多还原

【Abstract】 For the PC box girder bridge with corrugated steel webs, the shear distribution relationship during the construction phase of the beam section with lining concrete and steel webs is not clear. And there is also a lack of corrugated steel web buckling analysis. Taking the Xiao Cao Canal Bridge as an example and through the theoretical calculation and analysis of finite element method, the influence of the size of steel webs at the root of the bridge during the maximum cantilever construction period on the shear performance of the structure was performed. The results show that adding lining concrete can effectively reduce the shear stress level of steel web. The lining concrete takes over 60 % of the shear force when its thickness exceeds 20 cm.Changes in the thickness of the steel web at the root(16 mm, 20 mm, 25 mm, 30 mm, and 35 mm)have little effect on the shear stress of the steel web in the entire maximum cantilever status. The maximum shear stress of the web is 119.907 MPa, and no buckling occurs. The kind of structure has sufficient safety reserves and excellent shear performance.更多还原