By asking about HS20 Loads, I assume you are using the LFD Edition and NOT the LRFD Edition of AASHTO. Listen to Qshake, but don't forget the Impact load.
I won't do your calcs for you, but I will offer some suggestions.
First, calculate the applied moments using the AISC beam diagrams and then determine the required section modulus Sx=M/fb. Look through the Sx table in the AISC ASD manual until you find the next highest value for Sx in bold. The...
Have you looked into using precast elements with a form liner texture? Form liner has come a long way in recent years and can be stained to accurately mimic real stone. My experience shows that you will have fewer problems during construction and reduce the maintenance by using precast. Precast...
