Composite girder bridge deck
I have been trying to run temperature difference load cases 'Heating' and 'Cooling' on the attached MIDAS model we have created to design a simply supported bridge deck with concrete slab. We have bridge deck about 11.000m wide supported by 4 plate girders and 250 mm thick deck slab.
I have input the temperature difference loads contained in the load cases using 'Beam Section Temp'. For the input for these load cases I have used 0 as initial temperature and provided temperature gradient using top of the deck as the reference.
For the 'Heating' load case the analysis gives sagging moments in the internal longitudinal members and the hogging moments in the external longitudinal members.
For the 'Cooling' load case the analysis gives sagging moments in the external longitudinal members and hogging moments in the internal longitudinal members.
W can not understand why we are getting opposite sign bending moments in the external and the internal longitudinal members which are running along the global x direction.
|Stage_2 - GAST3 LC 27 Heating.pdf|
|Stage_2 - GAST3 LC 28 Cooling.pdf|
|Stage_2 - GAST3.mcb|