7. LOADS

CHAPTER 7 "CARGOES" 19 3.1.1.1 Temperature Change Member There are 2 types of temperature change in the member: These two types of temperature input have no essential difference except that a temperature difference ΔT from a reference temperature, from which axial stress is applied, is defined in the temperature change. In both types there is a temperature definition of the upper fiber T1 and the lower fiber T2, the difference of which causes bending stress. Finally there is also a temperature load input to the nodes: When there is a diaphragm function the beams move uniformly and not deform horizontally. So the temperature change is meaningless because they will not sense it. So when there is a diaphragm function, the temperature change should be applied to the nodes which nodes have their own degrees of freedom. A) "Transverse temperature" : Which creates torque in the member due to the temperature difference between the upper and lower . For example, if we want the difference to be 20◦C, we can set T1=40,T2=20 or T1=20,T2=0. As long as the difference is 20◦C. As thickness we always define the dimension of the member in which the temperature difference is defined. As thickness we always define the dimension of the member in which the temperature difference defined. The variation is by the thickness of the member. Attention: Application to local xy produces Mz torque, while application to local xz produces My (applies to the right and left fibre)