Experimental investigation on the damage accumulation of reinforced concrete columns under mainshock‐aftershock sequences

Abstract

This paper presents the details and results of shaking table tests conducted on six 1/3‐scaled reinforced concrete columns subjected to mainshock‐aftershock (MSAS) ground motions. For each of the two subsets distinguished by the axial compression ratio in the test matrix, one column specimen was subjected to a standard cyclic loading protocol, whereas the second specimen was subjected to a mainshock ground motion record followed by a standard cyclic loading protocol. The third specimen was subjected to MSAS ground motion records followed by a standard cyclic loading protocol. The cyclic loading protocol was used to examine the degradation of the seismic capacity of the specimens. The intensity of the aftershock ground motion record was 0.68 times that of the mainshock ground motion record. The test results indicated that the damage accumulation of columns induced by the MSAS sequence is significant in the shaking table tests, and the MSAS‐induced maximum displacement of the specimen with an axial compression ratio of 0.4 was approximately twice as large as that induced by mainshock only. In comparison with the mainshock only case, the aftershock further reduced the structural strength and stiffness of the specimens by 9% and 7%, respectively. The ductility of the specimens tended to decrease with the increase of damage. The damage accumulation of the column with a higher axial compression ratio was more serious than that observed in a column with a lower axial compression ratio.

In‐plane and out‐of‐plane seismic performance and damage evaluation of reinforced concrete shear wall structures subjected to mainshock‐aftershock sequences

“…The results showed that uncertainty in the vulnerability under the main shock and mainshock-aftershock sequence was greater than the uncertainty in the vulnerability under the main shock. Sun et al 13 conducted shaking table tests on six reinforced concrete columns under the action of mainshock-aftershock sequences. The results indicated that compared with the case where only the main shock occurred, the aftershock further reduced the structural strength and stiffness of the specimens by 9% and 7%, respectively.…”

“…The results showed that uncertainty in the vulnerability under the main shock and mainshock‐aftershock sequence was greater than the uncertainty in the vulnerability under the main shock. Sun et al 13 . conducted shaking table tests on six reinforced concrete columns under the action of mainshock‐aftershock sequences.…”

Research on Damage Mechanism and Performance-Based Design Process of Reinforced Concrete Column Members

“…There is a lack of correlation between the maximum displacement deformation of the structure and the earthquake duration [13], but there is a good correlation between the earthquake duration effect and the accumulated hysteretic energy of the structure under the earthquake actions [14]. With the intensification of the decay process, the correlation between the earthquake duration effect and the accumulated hysteretic energy is higher [15].…”

Seismic design of rectangular/square columns in SDOF systems based on their damage performance

“…Displacement-based and bearing-capacity-based seismic design methods can reflect the amplitude and frequency characteristics of earthquakes, but fail to consider the impact of earthquake duration on structures. [1][2][3][4] The energy-based seismic design method not only reflects the displacement deformation and bearing capacity, but also considers the cumulative energy dissipation damage caused by the earthquake duration, [5][6][7][8][9] which can fully reflect the impact of earthquake action on the structure.…”