{"id":3844,"date":"2019-01-15T08:25:16","date_gmt":"2019-01-15T08:25:16","guid":{"rendered":"http:\/\/buildsoftsupport.com\/?post_type=ht_kb&p=3844"},"modified":"2019-01-15T08:25:16","modified_gmt":"2019-01-15T08:25:16","slug":"why-is-the-sum-of-results-of-the-seperate-load-groups-not-equal-to-the-results-in-a-combination","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/es\/knowledge-base\/why-is-the-sum-of-results-of-the-seperate-load-groups-not-equal-to-the-results-in-a-combination\/","title":{"rendered":"Why is the sum of results of the seperate load groups not equal to the results in a combination?"},"content":{"rendered":"

The sum of the results in the separate load groups equal the results in a combination on the condition that the model does not contain non-linearities.<\/p>\n

Example<\/h2>\n

A beam is loaded with 2 load groups. For these 2 load groups the bending moment My is also determined.<\/p>\n

\"\"<\/p>\n

Consider a combination 1.5 x Load1 + 1.0 x Load2.<\/p>\n

Using hand calculations, you’d expect a bending moment of\u00a01.5 x\u00a05.63kNm + 1.0 x -11.25kNm = -2.81kNm. And indeed, in Diamonds we find -2.81kNm. This method of calculating is called ‘Superposition<\/strong>‘.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

Lets redo the exersize, but this time the support on the right can not take tension<\/strong>.<\/p>\n

\"\"<\/p>\n

The bending moment you’d calculate by hand equals 1.5 x\u00a05.63kNm\u00a0+ 1.0 x\u00a0-30kNm = -21.56kNm. This is not the same as the result you’d obtain in Diamonds:<\/p>\n

\"\"<\/p>\n

Cause:<\/p>\n