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为研究波形钢腹板(钢腹杆)-混凝土组合箱抗扭特性,进行了构件的抗扭承载力试验,结果表明:混凝土底板首先出现斜向裂缝,裂缝与混凝土主拉应变垂直,顶底板裂缝呈螺旋状开展,裂缝方向与主梁纵轴线约成45°;底板出现宽度较大的主斜裂缝,钢筋受拉屈服,组合箱受扭破坏。采用有限元软件ANSYS对扭转试验构件进行了非线性有限元分析,有限元分析结果与试验结果吻合良好。参照混凝土箱梁的开裂扭矩计算公式,建立了组合箱开裂扭矩的计算公式;应用混凝土箱梁变角度空间桁架理论,根据波形钢腹板(钢腹杆)-混凝土组合箱达到极限扭矩时可能出现三种破坏形式,建立了组合箱极限扭矩的计算公式。通过与试验结果和实桥截面有限元分析结果的比较表明,建立的波形钢腹板(钢腹杆)-混凝土组合箱抗扭承载力简化计算公式具较高精度,最大误差不超过10%,可运用于实桥计算。
In order to study the torsional behavior of the corrugated steel web (steel web) -substitching box, the torsional bearing capacity test of the component was carried out. The results show that the concrete slab first appears diagonal crack, the crack is perpendicular to the main tensile strain of the concrete, The cracks are spirally shaped, and the direction of the cracks is about 45 ° with the longitudinal axis of the main girder. The main slant cracks with larger width appear on the bottom plate, the steel bars yield and pull, and the combined box is twisted and damaged. The finite element software ANSYS was used to do the nonlinear finite element analysis of torsion test components. The results of finite element analysis agree well with the experimental results. According to the calculation formula of cracking torque of concrete box girder, the formula of cracking torque of composite box is established. According to the space truss theory of variable angle of concrete box girder, it may appear when the corrugated steel web (steel web) - concrete composite box reaches the limit torque Three kinds of damage forms, set up the combined box limit torque formula. The results of comparison with the experimental results and the finite element analysis of the actual bridge cross section show that the simplified formula for calculating the torsional load carrying capacity of the corrugated steel web (steel web) - concrete composite box has high accuracy with the maximum error less than 10% Can be applied to real bridge calculation.