Based on the analysis of bearing characteristic of the staggered truss system , a simplified calculation model of staggered truss structure under vertical loads or lateral loads is presented . after that , according to the simplified calculation model , iterate method for calculating internal forces of vierendeel staggered truss structure under vertical loads and a method for calculating member forces and lateral deflection of structure is provided . at last , a method for calculating effective - length factor of column is provided by analyzing the effect of restraint of column ends , other columns in same story and neighboring story on effective - length of columns 通过对交错桁架结构体系受力特点的分析，确定了在竖向荷载和水平荷载作用下交错桁架结构体系的简化计算模型；然后，根据计算模型，提出了竖向荷载作用下空腹交错桁架结构的内力迭代计算方法以及水平荷载作用下交错桁架结构的内力和侧移计算方法；最后，通过分析柱端约束、同一楼层其它柱子以及相邻楼层柱子的影响，给出了柱子计算长度系数的计算方法。
By using the presented method , the number of nodes having a hand in the iteration is obviously reduced ; and the voltage at each load point and the line losses of distribution network can be directly obtained without iteration ; thereby the line losses of the whole distribution network can be accurately determined 该方法的计算精度比较高，可大大减少参与迭代计算的节点数，而且各负荷点的电压以及配电网的线损不需迭代就可以直接计算得到，从而精确得到整个配电网的线损。
