Round-ended Pier And Pile Foundation Of Railway Bridge Limit State Design Method Research

Currently, the mainstream approach of international bridge engineering design has completed the transition from the allowable stress method to limit state method which base on reliability theory. However, Chinese railway bridge engineering still uses the allowable stress method to do the design calculation. Japan, Europe, the United States and other developed countries all use the limit state design method based on reliability theory. In order to meet international standards, the bridge design method needs to be changed from the allowable stress method to limit state method.According to the relevant research results base on the2011edition of "Railway Bridge Design Standard (limit state method)"(draft), by using the advanced technology and research result for reference and collecting the relevant information, railway bridge gravity piers section calculation is programmed. The reliability index of round-ended railway bridge and hollow entity pier is calculate depend on the current standard and bridge engineering experience. In the reliability index calculation process, the statistical work is done on the operational factors and the calculationon the effect respectively is also done. To calculate the area of the cross-sectional compression zone, the area of round-ended pier-side cross-sectional compression zone calculation procedure is programed. For the5sets of round-ended hollow pier and entities pier the standard diagram contain176piers, the normal limit state and the ultimate limit state inspection reliability index is calculated, and the calculation results are analyzed.The single pile bearing capacity of pile foundation calculation is programed base on the2011edition of "Railway Bridge Design Standard (limit state method)"(draft). The program contains four modules:Driven, vibration sinking or pile tip explosion-expanded pile. Drilled pile and holing pouring pile. Driven, vibration sinking pile on the rock layer. Rock-socketed piles (including column). The difference between Chinese norm and European norm on pile foundation is compared. And two examples are picked to do the comparison calculation according to the European standard and Chinese standard. Single pile bearing capacity calculation is programed to analyze the example. By comparing the results, the calculation difference between European standard and Chinese standard is analyzed. So it will give the data support for the revise of future pile foundation pile side resistance partial coefficients and revision pile tip resistance partial coefficients.