此时绳长就是该建筑物的高度。
当极点确定时，观测器对绳长变化比吊重变化敏感。
Observer is more sensitive to the change of rope length than the change of load mass when the poles are determined.
算例结果表明，通过优选绳系形式、吊点位置、绳长等参数，能使最大弯矩峰值下降30%左右。
Results show that the peak of maximum moment is decreased by about 30% after reasonably choosing the rope system, pickup point arrangement and rope element length.
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