TOOL FOR DYNAMIC ANALYSIS OF CONCRETE BOX TUBES SUBJECTED TO TORSION

A microcomputer-based software system DSBT (dynamic solver for reinfor ced concrete box tubes) is developed. The program is coded in C and ca n be conveniently executed on a personal computer. The theoretical bac kground for this program includes three parts: (1) the truss model the ory for the primary curves of box tubes, (2) the analytical model of t he hysteresis loops, which describes the behavior of the box tubes und er repeated loading and unloading, and (3) the dynamic model used for dynamic analysis. The combination and implementation of these three co mponents forms a useful tool for the dynamic analysis of such box tube s. Using this tool, three examples are analyzed: a box tube under stat ic torsion, a one-storey box tube and an eight-storey box tube subject ed to dynamic torsion.