{"id":5490,"date":"2020-06-25T14:10:40","date_gmt":"2020-06-25T14:10:40","guid":{"rendered":"http:\/\/buildsoftsupport.com\/?post_type=ht_kb&p=5490"},"modified":"2023-08-17T10:16:17","modified_gmt":"2023-08-17T10:16:17","slug":"why-does-the-deformation-at-time-infinite-differ-from-the-deformation-calculated-in-time","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/es\/knowledge-base\/why-does-the-deformation-at-time-infinite-differ-from-the-deformation-calculated-in-time\/","title":{"rendered":"Why does the deformation at time infinite differ from the deformation calculated in time?"},"content":{"rendered":"

Overview of the differences<\/h2>\n

If you would compare the cracked deflection\u00a0\"\"<\/a> to the cracked deflection \"\"at time\u00a0t = \u221e, <\/em>they’re not equal if you use default settings. This is why:<\/p>\n\n\n\n\n\n\n\n
The deformation at time infinite\u00a0\"\"<\/a><\/th>\nThe deformation over time\u00a0\"\"<\/th>\n<\/tr>\n
The result of this calculation is on deformation at time t = \u221e<\/em>.<\/td>\nThe result of this calculation is the deformation at different times and at time t = \u221e<\/em>.<\/td>\n<\/tr>\n
The cracked stiffness<\/strong> is determined using a SLS RC enveloppe.<\/td>\nThe cracked stiffness<\/strong> is determined using the combinations imposed by the user.<\/p>\n
    \n
  • Some clients use\u00a0a SLS QP for dead loads and a SLS RC for variable loads.<\/li>\n
  • Some clients use an SLS RC 1 for both dead loads and variable loads.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
Non-linearities (no tension at top walls, support that cannot bear tension, …) are taken into account.<\/td>\nNon-linearities are neglected.<\/td>\n<\/tr>\n
It is supposed\u00a0that all loads cause creep.<\/td>\nIt is supposed that all permanent loads (self-weight and dead loads) + the quasi permanent\u00a0part of the variable loads cause creep.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The deformation at time t = \u221e\u00a0<\/em>calculated with \"\"<\/a>, is usally larger then the deformation at time t = \u221e\u00a0<\/em>calcualted with \"\".<\/p>\n

How to obtain\u00a0approximately the same result for both calculation methods<\/h2>\n

The settings for this\u00a0\"\"<\/a> calculation cannot be changed by the user, so will change the setting of this \"\"\u00a0calculation so the results approach those of this \"\"<\/a>calculation.<\/p>\n

    \n
  1. Remove all non-linearities from the model.<\/li>\n
  2. Select SLS RC 1 (we cannot select and SLS RC enveloppe,\u00a0so we select the next best thing: SLS RC 1) as the combination for cracking for all load groups \"\"<\/a>.\"\"<\/li>\n
  3. Add an additional combination (named ‘New combination in the image below’) to\u00a0\"\".
    \nMake sure to set the factor Cc(t) to 1 for all load groups. Meaning that all load groups cause creep for the full 100%.    \"\"<\/a><\/li>\n
  4. Compare the cracked deformation of this new combination with the cracked deformation obtained with\u00a0this\"\"<\/a>calculation.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Overview of the differences If you would compare the cracked deflection\u00a0 to the cracked deflection at time\u00a0t = \u221e, they’re not equal if you use default settings. This is why: The deformation at time infinite\u00a0 The deformation over time\u00a0 The result of this calculation is on deformation at time t…<\/p>\n","protected":false},"author":3,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":[],"ht-kb-category":[68],"ht-kb-tag":[987],"_links":{"self":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/5490"}],"collection":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/comments?post=5490"}],"version-history":[{"count":3,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/5490\/revisions"}],"predecessor-version":[{"id":9993,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/5490\/revisions\/9993"}],"wp:attachment":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/media?parent=5490"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb-category?post=5490"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb-tag?post=5490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}