{"id":18751,"date":"2025-10-10T14:47:02","date_gmt":"2025-10-10T14:47:02","guid":{"rendered":"https:\/\/support.buildsoft.eu\/?post_type=ht_kb&p=18751"},"modified":"2025-11-17T09:57:46","modified_gmt":"2025-11-17T09:57:46","slug":"there-are-two-options-to-model-a-hollow-core-slab-which-one-do-i-use","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/es\/knowledge-base\/there-are-two-options-to-model-a-hollow-core-slab-which-one-do-i-use\/","title":{"rendered":"There are two options to model a hollow-core-slab. Which one do I use?"},"content":{"rendered":"

The two options we’re talking about are \"\"\u00a0and \"\".<\/p>\n

Let’s talk about the differences first<\/h2>\n

Besides the above mentioned difference, there is another difference regarding the torsional rigidity (= D66<\/sub> in the stiffness matrix<\/a>) :<\/p>\n\n\n\n\n\n
\"\"<\/th>\n\"\"<\/th>\n<\/tr>\n
The size of the openings cannot be entered. Thus by default the weight reduction due to the openings is neglected. If you do want to take it into account, we recommend playing with the self-weight of concrete to compensate (see Material library<\/a>).<\/td>\nThe size of the openings can be entered. Thus the weight reduction due to the openings is automatically taken into account.<\/td>\n<\/tr>\n
By default the torsional rigidity is neglected ( = the torsional factor is equal to 0%) to match beam-behaviour.\"\"<\/a>You can take the torsional ridigidy into account by entering a value for the torsion factor.<\/td>\nBy default the torsional rigidity is calculated using a torsion factor of 80%.<\/p>\n

You cannot change the torsion factor.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Notes:<\/p>\n