求翻译：　 对于双立柱堆垛机机架结构，首先确定堆垛机机架的尺寸；其次对水平载荷产生的弯矩、由行走车轮的反力产生的弯矩、有叉取作业产生的弯矩进行受力分析；然后估算其初始值，再进行校核；最后确定实际值。是什么意思？

For the double-column stacker rack structure, first determine the size of the stacker rack; the second moment of the horizontal load generated by walking wheel reaction force moment, the moment generated by the fork take the job carried out by The force analysis; and then estimate its initial value,

For a dual-standard stack-frame structure, first determine if the stack frame size; and the second level of the bending load torque converter, and walk by the wheel of the anti-competitiveness have bent a fork lift truck, the job of the Force to bend torque analysis; and then assess their initial va