六面体单元下预应力等代荷载计算

对于具有复杂几何形状的桥梁，用体单元进行有限元分析有得天独厚的优势。预应力在有限元分析中一般按等代荷载考虑，但体单元的预应力等代荷载计算很少见到讨论。笔者提出一种运用高斯积分和牛顿迭代法的数值算法计算体单元情况下的预应力等代荷载，该方法能够适应各种复杂的预应力钢束形状。经过算例检验，该方法有很高的精度。

Calculation for equivalent loads of prestress in hexahedron element

For the bridge of complex geometry shape,body element analysis has excellent advantage in the FE analysis.Prestress is converted normally into equivalent loads in the finite element analysis,but calculation of equivalent loads of prestress in body element is very few to be discussed.The authors put forward a kind of numerical method combined with the Newton iterative algorithm and Gauss integral algorithm,this method can meet be used to calculate the equivalent loads of prestress in the various complex steel in bundle shapes.Through the final regular inspection,this method has been proved to have very high precision.