Cable-stayed Bridge Design using Frame Elements only????

[Hirrah]

For my class assignement, Im to design a cable-stayed pedestrian bridge with steel tower and deck with box sections. The yield stress of the steel plates and high-strength cables are fy =400 MPa and fy =2000 MPa, respectively. Can anyone guide me as to how specifically define these materials in SAP2000?? Im using v14.

Also the bridge is to be designed using only frame elements. The cables comprise 72 strands and the total diameter of each cable is 150 mm. There are initial post-tensioning strains induced in the cables provided. How can I proceed with this?? Im new to SAP2000. Are there any tutorial links or any other guides I can follow to make this model???

Please if anyone is kind enough to help me out in this assignment?????

Thanks