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应用动态规划法，将吊车荷载不利组合问题转化为递推极值函数的数学问题，根据动态规划法的最优性原理，给出吊车荷载作用下的杆件最大内力，对控制内力的计算加以讨论，从而得出相关结论。
According to the principle of optimality of dynamic programming, the maximum internal force of the rod under crane load is given by applying the dynamic programming method to solve the mathematical problem of the disadvantageous combination of crane load to the recursive extremum function. Discussion, to draw the relevant conclusions.