{"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":"

Hello together,<\/p>\n

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

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

<\/a><\/p>\n

For a load in the linear elastic range, i evaluate the deflection at midspan and use this to determine the elastic bending stiffness. <\/p>\n

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. <\/p>\n

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. <\/p>\n

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.
why is this the case? have i chosen a wrong setting in ansys?<\/p>\n

Thank you for your help!<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-370430","topic","type-topic","status-closed","hentry","topic-tag-composite"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t