Abstract
The performance of precast concrete structures is greatly influenced by the response of beam–to-column connections. In this study, a new moment resisting precast concrete beam-column connection detail with post-tensioning bolts, made out of high yield strength spring steel, has been experimentally investigated as an alternative to the conventional precast moment resisting connections. Precast specimens and an aseismic monolithic reference specimen have been tested under reverse cycling loads. The contribution of the mild steel in the connection region to the flexural moment capacity, and to the initial pre-stressing force on post-tensioning bolt have been the main test variables. The moment capacity, stiffness, energy dissipation capacity and the residual displacement performance of the precast connections have been compared with those of the aseismically detailed monolithic connection. The conducted tests reveal that the connection detail with steel corbel along with the post-tensioning bolt and mild steel has superior performance properties as compared to the companion precast specimens.
Highlights
Precast concrete construction is considerably advantageous in terms of quality and notably the duration of the construction
As joints are considered to be the most important component of the precast structures, reported studies generally aimed to improve the connection performance. In this contextthere are many studies showing that the behavior of moment-resisting beam-column connections, which are frequently applied in multistory precast concrete structure, should behave similar to those of the aseismically detailed cast in place connections, in terms of strength, rigidity, ductility and energy dissipation capacity under reversed cyclic loads (Englekirk, 1990; Stanton et al, 1991)
No significant strength degradation has been observed in the monolithic connection until 4.00% story drift level, and the behavior was ductile
Summary
Precast concrete construction is considerably advantageous in terms of quality and notably the duration of the construction. A testing program has been designed to evaluate the earthquake performance of the proposed moment resisting precast concrete beam-to-column connection detail under reversed cyclic loading in order to investigate its seismic performance in terms of moment capacity, stiffness, energy dissipation and residual displacements. The main test variables in the connection are the mild steel reinforcement ratio and the initial post tensioning force applied on high-strength post tensioning bolts. Strain gauges were placed on the steel bars to determine the yield displacement of the mild steel reinforcements
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