Experimental investigations on the seismic performance of prefabricated assembled piers considering the variation of socket depth
To investigate the impact of socket depth on the seismic performance of socket structures,a group of a cast-in-place pier and precast piers considering the variation of socket depth were designed and fabricated,of which the socket depths of the socket piers were 1.0d (where d represents the side length of the square pier),0.8d,and 0.6d,respectively.Pseudo-static tests were conducted to analyze the damage patterns,hysteresis performance,and energy dissipation capacity of the piers,allowing for an examination of the influence of socket depth on their behavior.The test results demonstrate that the bearing capacity of the four groups of specimens is similar.The socketed piers with a socket depth of 1.0d exhibit damage patterns and hysteresis curves that are comparable to those of cast-in-place piers,indicating equivalent seismic performance.However,the ductility of the socket piers with embedment depths of 0.8d and 0.6d is weaker than that of the cast-in-place piers due to damage to the footing.By comparing the damage phenomenon,the relative relationship between the shear bearing capacity of the footing sidewall and the ultimate bearing capacity of the column is analyzed under the existing reinforcement ratio.As the socket depth of the pier decreases,the shear capacity of the groove sidewall decreases.This increases the probability of damage to the groove sidewall due to the reduced shear bearing capacity.Therefore,it is crucial to consider the relative relationship of the bearing capacity between the footing and the column when selecting the socket depth in the design to prevent damage in the footing position.
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