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通过影响面理论，绘制网架所有杆件内力影响面的方法，求解悬挂吊车荷载作用下该量值的影响量，根据这些影响量从而计算网架林件内力的不利组合．
By influencing the surface theory, the method of drawing the influence surface of all the internal forces of the grid frame is solved, and the influence quantity of the suspended crane under the load is calculated. Based on these influence quantities, the unfavorable combination of internal forces of the network frame timber pieces is calculated.