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UNIF 1 TO 2 UY=-2.3 On the element from 1 to 2 a uniform load with a magnitude of 2.3 lbs. per inch acts in the -Y direction.
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UNIF 1, 2, UY -2, 3 Same
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UNIF 100 TO 200 INC=2 INCTO=3
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LAST=500 UX=0.03, -1, 0.03 There are uniform loads acting on elements 100-200, 102-203,...,300-500 with a small horizontal component and a -1 load in the Y. It looks like you have G load input for the piping problem.
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UNIF (1) to (30) UY=-2.3 The first thirty elements in the element list have a uniform load of -2.3 pounds per inch acting in the -Y direction.