Simulation Analysis of the Collapse Process of 18-Story High-Rise Steel Building Based on the 3-D Large-Scale Shaking-Table Test

Abstract eng:
The large scale shaking-table test of 18-story high-rise steel building was carried out at the E-Defense of Hyogo Earthquake Engineering Research Center. Through the study, analytical model could be developed to evaluate the collapse mechanism as the shaking-table test result for the first time. Simulation analysis was conducted with the proposed hysteresis model considering the lower-flange fracture. The outcomes of the comparison between the simulation analysis and the shaking-table test results are summarized as follows: 1) Overall behavior of the test specimen The maximum response of story drift angles of analytical results for all excitation levels were similar to the test results less than pSv300 and were slightly higher under the level of pSv300 to pSv420 excitation. The maximum shear forces of analyses corresponded to the test results, and the degree of increase in shear force with changes in excitation level agreed well. The time history of relative displacement of the 12th floor was represented well by the simulation analysis, except the residual deformation. The deterioration of shear force versus story drift angle was evaluated well, especially in the characteristic of reverse S-shaped hysteresis. 2) Progress of pre-collapse damage Good correspondence with the test results was seen for the each stage of damage process, namely: yielding of the beam ends and column ends at the first floor, first occurrence of fracture of the lower flanges of the beam-ends at the second floor, spread of fracture to some beam-ends at the upper floors, fracture of the lower flanges of all the beam-ends at the lower floors, and large deformation of the lower floors. 3) Mechanism of the eventual collapse The influence of the P-Δ effect became remarkable as the increase in the horizontal deformation, and further major deformation occurred after that. At the end, the enormous deformation occurred at lower five floors and the test specimen led to collapse. The analysis was well represented the test results above mentioned. The validity of the simulation analysis model with the proposed deterioration hysteresis model was verified on the basis of above three points of view.

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