Abstract
Precast column foundation connection is one of the critical connections under reverse cyclic loading, and the present study focuses on this connection. Three types of connections were considered, such as (i) base plate connection, (ii) pocket connection, and (iii) grouted sleeve connection. All the above connections were designed, and experimental investigation was carried out on 1 : 2 scaled models by subjecting the column to lateral reverse cyclic loading. Displacement-controlled loading pattern has been adopted for the testing of the specimens. The structural response of the connection was studied for their (i) load-displacement hysteresis behaviour, (ii) stiffness degradation, (iii) energy dissipation, and (iv) ductility. The results were then compared with that of the monolithic connection. The precast connection was more ductile, and the energy dissipated by the pocket connection was high compared to the base plate and grouted sleeve connection. The ductility and the load-carrying of grouted sleeve connection were small compared to other connections. The results of the study showed the precast column foundation can be used in seismic prone areas.
Highlights
Rapid growth in the construction industry necessitates quality construction along with a reduction in construction time and cost-effectiveness of structural elements and materials. is is achieved by precast concrete construction which has been used widely internationally due to better quality control, compared to onsite constructions
Despite of many of its advantages, precast concrete structures have failed during an event of an earthquake, and the failure is attributed to the improper connection between the structural elements [1]. e connection between the various structural elements such as beams, columns, slabs, and walls must integrate effectively to ensure safety, serviceability, and durability [2]. e response of precast concrete structures is driven by the most critical connections which include external and internal beam-column connections, wall-to-wall connections, wall-to- slab connection, and column-tofoundation connections. e seismic response greatly depends on the behaviour of the connection system, and the key role was played by proper design and detailing of the joints [3]. e problem associated with the external beamcolumn connection is lack of ductility and low shear strength
Number of research has been focused on this connection to improve its flexural strength, shear strength, and ductility by providing a variety of wet and dry connections [4, 5]. e behaviour of precast shear wall and slab connection has been studied using in situ concrete and dowel bars [6], and the precast connection showed superior behaviour concerning ultimate load and ductility compared with monolithic connection [7]
Summary
Rapid growth in the construction industry necessitates quality construction along with a reduction in construction time and cost-effectiveness of structural elements and materials. is is achieved by precast concrete construction which has been used widely internationally due to better quality control, compared to onsite constructions. E response of precast concrete structures is driven by the most critical connections which include external and internal beam-column connections, wall-to-wall connections, wall-to- slab connection, and column-tofoundation connections. E behaviour of precast shear wall and slab connection has been studied using in situ concrete and dowel bars [6], and the precast connection showed superior behaviour concerning ultimate load and ductility compared with monolithic connection [7]. An evaluation of the response of welded connection in steel column shoe connected to the foundation through anchor bolts was examined by Bianco et al [10], and it was studied that the collapse mechanism is governed by the behaviour of anchor bolts without significant damage to the column specimen. A study was conducted by Aboukif et al [12] on pocket base connections using the Leonhardt and Monnig model. e experimental results proved that the connection is of the closest type to monolithic connection, where no failure occurred in the pocket itself
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