Midas Civil program was used to investigate the lateral response of the structure to investigate pier deflections, modular joint movement, and lateral reactions at abutments. The Initial model was developed using steel composite girder bridge wizard. Midas also has capability for you can define deck pouring sequence and how much you want to pour at positive moment region first, and negative moment region later. It was nice capability. I also want to point out that midas Civil also has composite section properties that considering warping effect, when you select the option, you will get a better representation of the warping stiffness of the system.