1.7.3.1 Problem of Sag due to Concektrated Stress
Study of minimum number of ply against the problem of sag being increased between carriers by lumps of carrying material. As to the problem of sag it is usual that the sag is applied in such a manner that it is kept within 2% of the carrier spacing. But, abnormal sag is created between two carriers when big lumps are loaded, even if the total carrying quantity is unchanged. Table 1.24 shows the minimum numbers of ply against this problem.