3D Temporal Characteristics Analyses for Seismic Responses of Structures

Abstract eng:
Studies of 3D temporal characteristics of earthquake ground motions and the structural responses are definitely motivated by seismic damage to structures. It is well known that six degree-of-freedom-correlated dynamic forces can cause complicated structural damage and the unidirectional based indexes may only capture the damage potential of a ground motion that can be observed in the projected direction. However, most of the currently used ground motion indices largely simplify the essential kinematics relationship of the 3D time histories; no longer contain sufficient information to differentiate the various causes and formations of the damage characteristics of the underlying ground motions. To understand the 3D temporal characteristics of the ground motion and their impact on structures, a different set of 3D temporal parameters can be used, including instantaneous tangential, normal accelerations and two temporal rotations. In this paper, using the recently developed 3D temporal characteristics analysis, the typical features of the seismic responses of a down scaled of a high rise building structure (1/30) in a shaking table test are analyzed and compared with that of the corresponding ground excitations. Some useful phenomena are found: The occurring time of the maximum a and the peak values of a is not only determined by the peak values of negative aT , positive aT and aN but also by the negative aT , positive aT and aN ,in most cases, the maximum aN and a usually happened simultaneously or very closely with each other, which indicates that the direction change plays an important role to the PGAs of not only the ground motions but also the seismic response of structures.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket