不同连接程度板桁桥对混凝土板应力的影响

针对目前高速铁路应用较多的64m下承式板桁半结合桥,通过改变混凝土与钢桁梁之间连接刚度以及剪力键分布距离来分析比较其对混凝土应力的影响,计算表明,连接刚度的增加,混凝土板的轴向应力随之增加,但弯曲应力影响较小。通过剪力键布置间距减小,纵梁上方处混凝土板应力影响较大,而混凝土边缘以及中心线处应力影响较小。

Effect of Plate Girder Bridge with Different Coupling Stiffness on Stress of Concrete Slab

In terms of 64m through semi-combined plate girder bridge which is used more widely at present,the effect of coupling stiffness between concrete & steel truss girder and distribution distance of shear key on concrete slab is analyzed and compared by changing the coupling stiffness and distribution distance.The calculation shows that with the increase of coupling stiffness axial stress of concrete slab increases while beading stress is slightly affected.By decreasing the distribution distance of shear key,stress of concrete slab at the upside of longitudinal girder is largely affected and the stress at the edge while along the center line is slightly affected.