High Pier - Span Continuous Rigid Frame Bridge Ultimate Bearing Capacity And Wind Performance Studies,

With the span of the continuous rigid frame bridges becoming longer and the pier becoming higher, it is much more important to pay attention to the stability and wind-resistant performance of them.Taking the Wenming Bridge and Shandianjiang Bridge in Ruchen Highway as the background engineerings,the stability and wind-resistant behavior were studied in this paper,which are composed of the following six aspects.(1)By use of the finite element program Midas-civil,the first-order linear stabilities in representative work conditions,such as the highest pier,the maximum cantilever and the fulfilled bridge condition of the two bridges, were analysed.(2)By ues of the finite element program Midas-civil and with the effect of the initial imperfection taken into account,the geometrical nonlinearity stabilities at the maximum cantalever stage were analysed to discuss the effect of the geometrical nonlinearity to the stability.(3)By use of the finite element program Midas-FEA, the geometrical and material nonlinearity stabilities at the maximum cantalever stage were analysed.The results show that the effect of material nonlinearity in the stability analysis must be considered in order to reveal the ultimate bearing capacity of the structure.(4)By use of the Fluent software, the aerostatic coefficients of the single girder cross-section of Shandianjiang Bridge were calculated and the effect of different factors to aerostatic coefficients were discussed in this paper.(5)Based on the result of the aerostatic coefficients,this paper made a preliminary study on galloping stability,flutter stability,vortex-induced vibration and the internal forces induced by wind loads.(6)Additionally,the aerodynamic interference effect on aerostatic coefficients of a double-deck bridge with different bridge distance and wind attacks were studied in this paper.