大縱肋正交異性組合橋面板疲勞性能研究
[Abstract]:The concrete structure layer is introduced into the slab structure of the large longitudinal rib orthotropic steel bridge. The steel deck slab and the concrete structure layer are composed of a new type of orthotropic composite deck slab with large longitudinal rib. It is an effective way to improve the fatigue performance of orthotropic steel bridge slab with large longitudinal ribs from the structural system level. Based on the finite element numerical analysis, the stress amplitude improvement effect of orthotropic composite deck system with large longitudinal ribs on the typical fatigue vulnerability details of steel bridge panels is determined. The fatigue test of key fatigue vulnerability details of structure is carried out by full-scale segment model test. The fatigue safety of key fatigue vulnerability details during the design life period and the durability of concrete structure under fatigue load are verified. On this basis, the fatigue damage evolution of the key fatigue vulnerability details and the fatigue failure mode of the structural system are studied experimentally and theoretically. The results show that the large longitudinal rib orthotropic composite deck structure system can significantly reduce the stress amplitude of U rib and roof and the connecting details of U rib and transverse partition. The opening position of transverse partition is the key structural detail to control the fatigue performance of steel bridge panel. The fatigue performance of steel bridge slab and the fatigue durability of concrete structure layer meet the requirements of design life and have certain safety reserve. The fatigue cracking in the negative moment region of concrete structure has no significant effect on the fatigue performance of steel bridge slabs, and the fatigue failure mode of large longitudinal rib orthotropic composite deck slab shows typical two-stage characteristics. The fatigue fracture of the bolt leads to the local deterioration of the combined effect, which accelerates the fatigue damage accumulation rate of the key fatigue vulnerability details of the steel bridge panel and finally the fatigue cracking.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(51578455,51178394,51378431) “十二五”國家科技支撐計(jì)劃項(xiàng)目(2011BAG07B03) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2682014CX078)
【分類號】:U441.4
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