整体化层厚度对空心板受力性能影响研究

Study on Influence of Integral Layer Thickness on Mechanical Performance of Hollow Slab

摘要:

对于空心板梁而言，由于缺少横隔板、横隔梁等可以提供强大横向联系的结构构造，因此其横向联系和整体性相对较弱。研究结果显示，增加空心板梁的整体化层（桥面现浇层和桥面铺装）的厚度可以明显改善结构的横向联系。以16 m空心板为例，通过建立有限元模型，对9、12、15、18 cm整体化层下空心板纵向受力、横向变形和支座脱空时结构安全性进行计算。结果表明，整体化层厚度增加对空心板受力有明显改善，15 cm厚度时活载效应降低值与恒载效应增加值之间差值最大，对空心板结构受力改善效果最明显，建议整体化层厚度取用15 cm。

Abstract:

For the hollow slab beams, due to the lack of structural components such as diaphragm plates and diaphragm beams that can provide strong lateral connections, the lateral linkages and integrity of these diaphragms are relatively weak. The results show that the increase of the integral layer thickness (bridge deck cast-in-place layer and bridge deck pavement) of the hollow slab beam can significantly improve the lateral linkages of the structure. Taking the 16-m hollow slab as an example, the finite element model is established to calculate the structural safety of the hollow slabs under the 9 m, 12 m, 15 m and 18 cm integral layers under longitudinal force, lateral deformation and bearing void. The results show that the increase of the integral layer thickness significantly improves the stress of the hollow slab. When the thickness is 15 cm, the difference value between the decrease value of the live load effect and the increase value of the dead load effect is the largest, and the improvement effect on the stress of the hollow slab structure is the most obvious. It is suggested that the thickness of the integral layer should be 15 cm.