{"id":370430,"date":"2024-07-04T09:02:51","date_gmt":"2024-07-04T09:02:51","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/composite-beam-stiffness-behaviour\/"},"modified":"2024-07-15T11:59:34","modified_gmt":"2024-07-15T11:59:34","slug":"composite-beam-stiffness-behaviour","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/composite-beam-stiffness-behaviour\/","title":{"rendered":"Composite beam: Stiffness behaviour"},"content":{"rendered":"<p>Hello together,<\/p>\n<p>I modelled a composite beam consiting of a steel girder and a cross laminated timber (CLT) slab in mechanical. The beam is a single span system with a line load.<\/p>\n<p>Every layer of the CLT is modelled individually. The material modell of the timber is defined as an orthotropic elasticity with three different modulus of elasticity for each direction.<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/04-07-2024-1720083558-mceclip0.png\"><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/04-07-2024-1720083558-mceclip0.png\"><\/a><\/p>\n<p>For a load in the linear elastic range, i evaluate the deflection at midspan and use this to determine the elastic bending stiffness.&nbsp;<\/p>\n<p>I compared the results to an analytical caluclation approach, a simplified truss modell with 2d elements for the timber and another numerical modell with 3d elements for the timber. All these calculations lead to significantly lower deformations (10 to 25 %) although all parameters were inserted the same.&nbsp;<\/p>\n<p>If I calculate the CLT plate or the steel beam alone, the result is the same in all programmes as in ansys. if I set the modulus of elasticity at right angles to the plate plane very high in ansys, the result is also the same.&nbsp;<\/p>\n<p>The composite bending stiffness is therefore determined much lower with ansys because the modulus of elasticity at right angles to the plane of the panel has a much greater effect than with the other programmes.<br \/>why is this the case? have i chosen a wrong setting in ansys?<\/p>\n<p>Thank you for your help!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-370430","topic","type-topic","status-closed","hentry","topic-tag-composite"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["408"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1721044748:15140"],"_bbp_subscription":["88","5915"],"_bbp_topic_id":["370430"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","5915","432614"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["373356"],"_bbp_last_active_id":["373356"],"_bbp_last_active_time":["2024-07-24 07:26:08"]},"test":"noah-boehmbau-thm-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/370430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/370430\/revisions"}],"predecessor-version":[{"id":371896,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/370430\/revisions\/371896"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=370430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}