Mechanics characteristics and analytical model of double-pile and double-column structure of bridge on steep transverse slope
The foundation of bridge in mountain area is inevitably built on steep slope,and the deformation or failure of unstable slope will pose a serious threat to the safety of overlying bridge span,so it is urgent to develop an efficient and reliable mechanical model.Firstly,the double pile and double column structure of the bridge was divided into different characteristic sections,and its mechanical characteristics were analyzed.Secondly,considering the coordination relationship between pile-soil interaction and pile top deformation,and introducing boundary conditions,a simplified model for the internal force and displacement of double-pile and double-column structure of bridge on cross slope section was established.Thirdly,considering the influence of P-Δ effect and cap/tie beam on the force of pile,the continuous conditions(i.e.,continuity of displacement,rotation angle,shear force and bending moment)satisfied by adjacent feature sections were introduced,the flexure differential equation was established,and the corresponding calculation program was compiled on the MATLAB platform.The power series solution of the internal force and displacement of the foundation of the double-pile and double-column structure of the bridge on the cross slope section was proposed.Finally,the reliability of the model was verified by comparing the model results with the finite element calculation results.The results show that the proposed model regards pier and pile foundation as a whole,and the model is also applicable to the structural analysis of multi-channel beams.The model takes into account the distribution of axial force and bending moment of the two piles in the transverse connection,and obtains the transverse force in the transverse connection.In addition,the model does not need to assume free section shear forces and iterative calculations.With the increase of residual glide force,the displacement and bending moment of piles in front and back of each characteristic section of the structure increase obviously.The lateral connection redistributes the displacement and internal force of pile foundation and has a strong constraint effect,which can better improve the load and deformation of front and rear piles.
bridge on transverse slopedouble pile and double column structuremechanics characteristicpower series solutionfinite element analysis
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维普
