轻型桥台受台背强夯振动力作用的力学模型

针对轻型桥台受台背强夯振动力作用的情况 ,确定桥台的受力和支撑条件 ,建立了桥台内力和位移计算的力学模型。通过计算分析表明 ,桥台承受强夯冲击的能力与支撑条件紧密相关 ;台背水平向合力的作用点位置是沿台高及台宽变化的 ,其最大水平方向位移或挠度的截面位置与最大拉应变的截面位置不一致 ,与支撑条件及台身高度等因素有关 ;结合对轻型桥台变形和受力极限值的分析可知 ,按近似梁的理论评价桥台承受振动及冲击的能力是安全的。

Mechanics model of light-weight back abutmentunder strong vibrating force

This paper argues about the definition of the force and support of abutment according to the back subgrade of light weight abutment under strong vibrating force,and the foundation of a model of mechanics for intefical force and displacement calculation.The calculation and analysis indicate that the bearing ability of abutment under strong vibrating force is closely related to the support.The horizontal resultant in back abutment is changed with height and breath,and the max horizontal displacement or deflection section is different from the max flexural tensile strain section.The cause is the support,height of abutment and other factors.Deformation and ultimate force of the light weight abutment are analyzed.Calculating results show that the approximate beam theory is safety to evaluate the resistance of abutment under strong vibrating and impact force.