DYNAMIC-RESPONSE OF BOX TUBES TO COMBINED SHEAR AND TORSION

Based on equilibrium and compatibility conditions, as well as a stress -strain relationship for softened concrete, a truss model theory for r einforced-concrete structural walls subjected to static shear was appl ied to determine the shear-force-displacement relationship as the prim ary curve for dynamic analysis. Similarly, the torque-twist relationsh ip of reinforced-concrete box tubes subjected to static torsion was ab le to be determined using the truss model theory. In this paper, the i nelastic dynamic response of reinforced-concrete box tubes to combined shear and torsion is predicted using the primary curve obtained by th e interaction relationship between shear and torsion, the hysteretic m odel proposed for reinforced-concrete structures under shear or torsio n, and the linear acceleration step-by-step method. Further, parametri c studies are performed using the proposed algorithms.