Experimental study on seismic performance of pre-assembled bridge piers with semi-grouting sleeves connected at different positions
In order to study the seismic performance of pre-assembled bridge piers connected with semi-grouting sleeves at different positions,three pre-assembled bridge piers connected with sleeves at the top(YZD-T specimen),middle(YZD-M specimen)and bottom(YZD-B specimen)of the pier body and one integral cast-in-place bridge pier specimen(XJD specimen)were designed and fabricated.The seismic performance of each specimen was studied by low-cycle repeated loading test.The research shows that the pre-assembled bridge piers connected with semi-grouting sleeves and the integral cast-in-place bridge pier specimen are both flexural failure and have strong bearing capacity.The difference of displacement ductility coefficient of each pre-assembled bridge pier specimens is within 5%,and it is smaller than that of the integral cast-in-place specimen.The yield displacement of YZD-M specimen is the largest.When the YZD-T specimen and the YZD-B specimen are destroyed,the stiffness of the YZD-M specimen is 8.26%,13.53%and 20.02%higher than that of the XJD,YZD-T specimen and the YZD-B specimen,respectively.The cumulative energy consumption is not much different from that of the XJD specimen,which is 1.95%and 23.72%larger than that of the YZD-T specimen and the YZD-B specimen,respectively.In contrast,among the pre-assembled pier specimens,the pre-assembled pier specimens connected in the middle of the pier have the best seismic performance and can be used as a recommended scheme for the design of pre-assembled piers.
pre-assembled bridge piersemi-grouting sleeveseismic performanceconnection position
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