Study on Seismic Performance of Precast Segmental Piers with Large-Diameter Grouted Sleeve Connections
Quasi-static tests and numerical simulation were carried to study the seismic performance of the precast segmental piers with large-diameter grouted sleeve connections.Two precast segmental piers with large-diameter sleeve connections(with main reinforced bars of 40 mm diameter)and one cast-in-place(CIP)pier were fabricated for the quasi-static tests,and the test findings,failure modes,hysteresis curves as well as the load bearing capacities of the two types of specimens were compared.The load bearing behaviors of concrete,sleeve and connection reinforced bars of the precast segmental piers were numerically simulated.The test results demonstrate that under horizontal cyclic loading,both the precast and CIP piers experienced flexure-shear failure,but with different failure modes in the pier bottom,especially large area crush of concrete at the foot of the CIP pier,while an even more severe damage in the precast pier—crush and spalling of large pieces of concrete circling the sleeve.Compared with the CIP pier,the average load bearing capacity and displacement ductility coefficient of the precast pier are 5.2％and 2.7％,respectively,but the mechanical property of the precast pier is as good as the CIP pier.The numerical simulation indicates that there are plastic zones on the top of the sleeve and in the bottom of the precast pier,with axial forces playing a dominant role,which should be given great concern in the sleeve design.The main reinforced bars and grout remain in reliable bonding state,indicating the precast segmental pier with large-diameter grouted sleeve exhibits sound seismic performance.
precast segmental pierlarge-diameter grouted sleevemechanical propertyseismic performancequasi-static testfinite element method
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