Would the locations of composite and non-composite vary depending on the placement of live loads?
Therefore, I could place a live load so that it causes positive bending in a region, but based on the set locations from the girder DL, it would use the steel girder only for section properties instead of the composite one. A: You may get different answers from different code writers. My explanation, as well as some of my colleagues, is this: • It is conservative to use non-composite section properties in the negative moment region. From the stiffness analysis point of view, the negative moment is less than assuming full composite in the negative moment region. (This option can be controlled by the program input, % of composite in the negative moment region). From the stress calculation point of view, depending on the shear studs in the negative moment region, the stress can be calculated by using steel section only or steel + rebar section. • It is true that the moving live load will cause negative bending in the negative moment region so as to cause moving of the contraflexural point
