This report documents the changes that have been made to the previous structure of the HR_DAD software, thereby developing the program HR_DAD_1.1 capable of calculating efficiently the response of large scale real world tall buildings made up of many thousands of members. In particular the following upgrades on the previous software have been implemented: (1) Capability of performing time-domain calculations, requiring times of the order of hours, of the peak demand in each member of a real size structure (estimated time for the previous version of HR_ DAD on an AMD Athlon 64 processor 3000+...