T型加劲肋钢顶板-纤维混凝土组合桥面板的抗弯承载力

Flexural bearing capacity of steel plate with T-shaped stiffener and fiber reinforced concrete composite slab

为研究考虑T型加劲肋贡献的组合桥面板抗弯承载力,采用经试验验证的有限元模型开展关键参数分析,主要影响参数包括纤维混凝土层厚度、纤维混凝土强度、钢顶板厚度、钢板强度和钢筋直径。结果表明:正弯矩抗弯承载力随纤维混凝土板厚度、纤维混凝土强度、钢顶板厚度和钢板强度的增加而提高;负弯矩抗弯承载力随钢顶板厚度、钢筋直径和钢板强度的提高呈线性增长趋势,但不随纤维混凝土强度增加而提升。基于组合桥面板的受力特性与破坏模式对其正负弯矩区的抗弯承载力公式进行研究,提出考虑T肋贡献修正系数的组合桥面板正弯矩区抗弯承载力修正计算公式,并推导出考虑T肋参与受力的组合桥面板负弯矩区抗弯承载力计算公式,均具有较好的计算精度。

In order to study the flexural bearing capacity of the composite bridge deck considering the contribution of T-shaped stiffeners,the key parameters were analyzed by using a test-validated finite element model,and the main influencing parameters included the thickness of the fiber reinforced concrete layer,the strength of the fiber reinforced concrete,the thickness of the steel roof,the strength of the steel plate and the diameter of the steel bar.The results showed that the flexural bearing capacity of positive moment increased with the increase of the thickness of fiber reinforced concrete slab,the strength of fiber reinforced concrete,the thickness of steel roof and the strength of steel plate;the flexural bearing capacity of negative moment increased linearly with the increase of the thickness of steel roof,the diameter of steel bar and the strength of steel plate,but not with the increase of fiber reinforced concrete strength.Based on the mechanical characteristics and failure modes of the composite deck,the flexural bearing capacity formula of the positive and negative bending moment regions was studied,the calculation formula of the flexural bearing capacity of the composite deck in the positive moment region was proposed,and the calculation formula of the flexural bearing capacity of the composite bridge deck in the negative bending moment area considering the T-rib’s participation in the force was deduced,all of which had a good calculation accuracy.